(19)
(11)EP 3 889 162 A1

(12)EUROPEAN PATENT APPLICATION

(43)Date of publication:
06.10.2021 Bulletin 2021/40

(21)Application number: 21159535.0

(22)Date of filing:  26.02.2021
(51)International Patent Classification (IPC): 
C07F 15/00(2006.01)
H01L 51/00(2006.01)
C09K 11/06(2006.01)
(52)Cooperative Patent Classification (CPC):
C09K 11/06; H01L 51/00; C07F 15/0033
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30)Priority: 23.03.2020 KR 20200035140

(71)Applicant: Samsung Display Co., Ltd.
Yongin-si, Gyeonggi-Do 17113 (KR)

(72)Inventors:
  • AHN, Eunsoo
    17113 Yongin-si (KR)
  • KO, Soobyung
    17113 Yongin-si (KR)
  • KIM, Haejin
    17113 Yongin-si (KR)
  • SHIN, Sujin
    17113 Yongin-si (KR)
  • LEE, Hyunjung
    17113 Yongin-si (KR)
  • HAN, Junghoon
    17113 Yongin-si (KR)

(74)Representative: Shearman, James Ward 
Marks & Clerk LLP 15 Fetter Lane
London EC4A 1BW
London EC4A 1BW (GB)

  


(54)ORGANOMETALLIC COMPOUND AND ORGANIC LIGHT-EMITTING DEVICE INCLUDING THE SAME


(57) Provided are an organometallic compound represented by Formula 1 and an organic light-emitting device including the same. The organic light-emitting device includes: a first electrode, a second electrode, and an organic layer between the first electrode and the second electrode and including an emission layer, wherein the emission layer includes the organometallic compound.




Description

BACKGROUND


1. Field



[0001] One or more embodiments of the present disclosure relate to an organometallic compound and an organic light-emitting device including the same.

2. Description of Related Art



[0002] Organic light-emitting devices (OLEDs) are self-emission devices that have wide viewing angles, high contrast ratios, short response times, and excellent characteristics in terms of brightness, driving voltage, and response speed, as compared to other devices in the art.

[0003] OLEDs may include a first electrode on a substrate, and a hole transport region, an emission layer, an electron transport region, and a second electrode sequentially stacked on the first electrode. Holes provided from the first electrode may move toward the emission layer through the hole transport region, and electrons provided from the second electrode may move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transit (e.g., transition or relax) from an excited state to a ground state to thereby generate light.

SUMMARY



[0004] One or more embodiments include an organometallic compound having a novel structure and an organic light-emitting device including the organometallic compound and having high luminescence efficiency and a long lifespan.

[0005] Additional aspects of embodiments will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments of the disclosure.

[0006] According to one or more embodiments, there is provided an organometallic compound represented by Formula 1

         Formula 1     M(L1)(L2)

wherein, in Formula 1,

M is selected from iridium (Ir), cobalt (Co), rhodium (Rh), and meitnerium (Mt),

L1 is a ligand represented by Formula 1-1, and

L2 is a bidentate organic ligand,



wherein, in Formula 1-1, ring A1 and ring A2 are each independently selected from a C5-C30 carbocyclic group and a C1-C30 heterocyclic group,

Y1 to Y4 are each independently selected from N and C,

X11 and X21 are each independently selected from N and C,

X31 is C(R31) or N, X32 is C(R32) or N, X33 is C(R33) or N, X41 is C(R41) or N, X42 is C(R42) or N, and X43 is C(R43) or N,

R1 to R4, R31 to R33, and R41 to R43 are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C18 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C18 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C7-C60 alkylaryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, a substituted or unsubstituted C1-C60 heteroaryl group, a substituted or unsubstituted C2-C60 alkylheteroaryl group, a substituted or unsubstituted C1-C60 heteroaryloxy group, a substituted or unsubstituted C1-C60 heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and - P(=O)(Q1)(Q2),

a1 and a2 are each independently an integer from 1 to 10,

n is an integer from 2 to 6,

* indicates a binding site to the metal M,

at least one substituent of the substituted C1-C60 alkyl group, the substituted C2-C60 alkenyl group, the substituted C2-C60 alkynyl group, the substituted C1-C60 alkoxy group, the substituted C3-C18 cycloalkyl group, the substituted C1-C18 heterocycloalkyl group, the substituted C3-C18 cycloalkenyl group, the substituted C1-C10 heterocycloalkenyl group, the substituted C6-C60 aryl group, the substituted C7-C60 alkylaryl group, the substituted C6-C60 aryloxy group, the substituted C6-C60 arylthio group, the substituted C1-C60 heteroaryl group, the substituted C2-C60 alkylheteroaryl group, the substituted C1-C60 heteroaryloxy group, the substituted C1-C60 heteroarylthio group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is selected from

deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group,

a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group, each substituted with at least one selected from deuterium, -F, - Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C3-C18 cycloalkyl group, a C1-C18 heterocycloalkyl group, a C3-C18 cycloalkenyl group, a C1-C18 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, -O(Q11), -S(Q11), -Si(Q11)(Q12)(Q13), -N(Q11)(Q12), -B(Q11)(Q12), -C(=O)(O11), -S(=O)2(Q11), and -P(=O)(Q11)(Q12)

a C3-C18 cycloalkyl group, a C1-C18 heterocycloalkyl group, a C3-C18 cycloalkenyl group, a C1-C18 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;

a C3-C18 cycloalkyl group, a C1-C18 heterocycloalkyl group, a C3-C18 cycloalkenyl group, a C1-C18 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C18 cycloalkyl group, a C1-C18 heterocycloalkyl group, a C3-C18 cycloalkenyl group, a C1-C18 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, - O(Q21), -S(Q21), -Si(Q21)(Q22)(Q23), -N(Q21)(Q22), -B(Q21)(Q22), -C(=O)(Q21), - S(=O)2(Q21), and -P(=O)(Q21)(Q22), and

-O(Q31), -S(Q31), -Si(Q31)(Q32)(Q33), -N(Q31)(Q32), -B(Q31)(Q32), -C(=O)(Q31), - S(=O)2(Q31), and -P(=O)(Q31)(Q2),

Q1 to Q3, Q11 to Q13, Q21 to Q23, and Q31 to Q33 are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C18 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C1-C60 alkyl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C60 alkyl group, a phenyl group, a biphenyl group, and a terphenyl group, and a C6-C60 aryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C18 alkyl group, a phenyl group, and a biphenyl group.



[0007] According to one or more embodiments, there is provided an organic light-emitting device including a first electrode, a second electrode, and an organic layer between the first electrode and the second electrode and including an emission layer, wherein the emission layer includes the organometallic compound.

[0008] At least some of the above and other features of the invention are set out in the claims.

BRIEF DESCRIPTION OF THE DRAWINGS



[0009] The above and other aspects and features of certain embodiments of the present disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic cross-sectional view of an organic light-emitting device according to an embodiment; FIG. 2 is a schematic cross-sectional view of an organic light-emitting device according to an embodiment; FIG. 3 is a schematic cross-sectional view of an organic light-emitting device according to an embodiment; and FIG. 4 is a schematic cross-sectional view of an organic light-emitting device according to an embodiment.

DETAILED DESCRIPTION



[0010] Reference will now be made in more detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the present embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the embodiments are merely described below, by referring to the figures, to explain aspects of embodiments of the present description. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Throughout the disclosure, the expression "at least one of a, b or c" indicates only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0011] An aspect of an embodiment of the present disclosure provides an organometallic compound represented by Formula 1 below:

         Formula 1     M(L1)(L2).



[0012] In Formula 1, M is selected from iridium (Ir), rhodium (Rh), cobalt (Co), and meitnerium (Mt). For example, M may be selected from iridium (Ir), rhodium (Rh), and cobalt (Co). For example, M may be Ir.

[0013] In Formula 1, L1 is a ligand represented by Formula 1-1 below, and L2 is a bidentate organic ligand:





[0014] In Formula 1-1, ring A1 and ring A2 are each independently selected from a C5-C38 carbocyclic group and a C1-C30 heterocyclic group. For example, ring A1 and ring A2 may each independently be selected from a C5-C20 carbocyclic group and a C1-C20 heterocyclic group.

[0015] In one embodiment, ring A1 and ring A2 may each independently be selected from i) a first ring, ii) a second ring, iii) a condensed ring in which two or more first rings are condensed with each other (e.g., combined together), iv) a condensed ring in which two or more second rings are condensed with each other (e.g., combined together), and v) a condensed ring in which one or more first rings and one or more second rings are condensed with each other (e.g., combined together),
the first ring may be selected from a cyclopentane group, a cyclopentene group, a cyclopentadiene group, a furan group, a thiophene group, a pyrrole group, a borole group, a phosphole group, a silole group, a germole group, a selenophene group, an oxazole group, an isoxazole group, an oxadiazole group, an isoxadiazole group, an oxatriazole group, an isoxatriazole group, a thiazole group, an isothiazole group, a thiadiazole group, an isothiadiazole group, a thiatriazole group, an isothiatriazole group, a pyrazole group, an imidazole group, a triazole group, a tetrazole group, an azasilole group, a diazasilole group, and a triazasilole group, and
the second ring may be selected from a cyclohexane group, a cyclohexene group, a cyclohexadiene group, an adamantane group, a norbornane group, a norbornene group, a benzene group, a pyridine group, a dihydropyridine group, a tetrahydropyridine group, a pyrimidine group, a dihydropyrimidine group, a tetrahydropyrimidine group, a pyrazine group, a dihydropyrazine group, a tetrahydropyrazine group, a pyridazine group, a dihydropyridazine group, a tetrahydropyridazine group, a triazine group, an oxasiline group, a thiasiline group, a dihydroazasiline group, a dihydrodisiline group, a dihydrosiline group, a dioxine group, an oxathiine group, an oxazine group, a pyran group, a dithiine group, a thiazine group, and a thiopyran group.

[0016] For example, ring A1 and ring A2 may each independently be selected from a benzene group, a naphthalene group, an anthracene group, a phenanthrene group, a triphenylene group, a pyrene group, a chrysene group, a furan group, a thiophene group, a silole group, an indene group, a fluorene group, a benzofuran group, a dibenzofuran group, a benzothiophene group, a dibenzothiophene group, a benzosilole group, a dibenzosilole group, an indole group, a carbazole group, an indenopyridine group, an indolopyridine group, a benzofuropyridine group, a benzothienopyridine group, a benzosilolopyridine group, an indenopyrimidine group, an indolopyrimidine group, a benzofuropyrimidine group, a benzothienopyrimidine group, a benzosilolopyrimidine group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazoline group, a cinnoline group, a phthalazine group, a phenanthroline group, a pyrrole group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isoxazole group, a thiazole group, an isothiazole group, an oxadiazole group, a thiadiazole group, a benzopyrazole group, a benzimidazole group, an imidazopyridine group, an imidazopyrimidine group, an imidazopyrazine group, a benzoxazole group, a benzothiazole group, a benzoxadiazole group and a benzothiadiazole group, but embodiments of the present disclosure are not limited thereto.

[0017] For example, ring A1 and ring A2 may each independently be selected from a benzene group, a naphthalene group, an indene group, a benzofuran group, a benzothiophene group, an indole group, a benzimidazole group a benzoxazole group, a benzoisoxazole group, a benzothiazole group, a benzoisothiazole group, a quinoline group, an isoquinoline group, a quinoxaline group, a phthalazine group, a quinazoline group, and a cinnoline group, but embodiments of the present disclosure are not limited thereto.

[0018] For example, ring A1 and ring A2 may be identical to each other. For example, ring A1 and ring A2 may both be a benzene group. While ring A1 and ring A2 may be identical to each other, the substituents of ring A1 and ring A2 may be the same or different. For example, ring A1 and ring A2 may both be a benzene group having the same or different substituents as each other.

[0019] In Formula 1-1, Y1 to Y4 are each independently selected from N and C.

[0020] In one embodiment, two selected from Y1 to Y4 may each independently be N, and the other two may each independently be C.

[0021] For example, one selected from Y1 and Y3 may be N, and the other may be C, and one selected from Y2 and Y4 may be N, and the other may be C.

[0022] For example, Y1 and Y2 may each independently be C, Y3 and Y4 may each independently be N, a bond between M and each of Y1 and Y2 may be a covalent bond, and a bond between M and each of Y3 and Y4 may be a coordination bond.

[0023] In Formula 1-1, X11 and X21 are each independently selected from N and C.

[0024] In one embodiment, X11 and X21 may each independently be C, but embodiments of the present disclosure are not limited thereto.

[0025] In Formula 1-1, X31 is C(R31) or N, X32 is C(R32) or N, X33 is C(R33) or N, X41 is C(R41) or N, X42 is C(R42) or N, and X43 is C(R43) or N.

[0026] In one embodiment, X31 may be C(R31), X32 may be C(R32), X33 may be C(R33), X41 may be C(R41), X42 may be C(R42), and X43 may be C(R43).

[0027] In Formula 1-1, R1 to R4, R31 to R33, and R41 to R43 are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) alkyl group, a substituted or unsubstituted C2-C60 (e.g. C2-C20) alkenyl group, a substituted or unsubstituted C2-C60 (e.g. C2-C20) alkynyl group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) alkoxy group, a substituted or unsubstituted C3-C18 cycloalkyl group, a substituted or unsubstituted C1-C18 heterocycloalkyl group, a substituted or unsubstituted C3-C18 cycloalkenyl group, a substituted or unsubstituted C1-C18 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 (e.g. C6-C30) aryl group, a substituted or unsubstituted C7-C60 (e.g. C7-C30) alkylaryl group, a substituted or unsubstituted C6-C60 (e.g. C6-C30) aryloxy group, a substituted or unsubstituted C6-C60 (e.g. C6-C30) arylthio group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) heteroaryl group, a substituted or unsubstituted C2-C60 (e.g. C2-C20) alkylheteroaryl group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) heteroaryloxy group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and -P(=O)(O1)(O2).

[0028] In one embodiment, R1 to R4, R31 to R33, and R41 to R43 may each independently be selected from:

hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 (e.g. C1-C20) alkyl group, and a C1-C60 (e.g. C1-C20) alkoxy group;

a C1-C60 (e.g. C1-C20) alkyl group and a C1-C60 (e.g. C1-C20) alkoxy group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, - CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a naphthyl group, a pyridinyl group, and a pyrimidinyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, and an indolocarbazolyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, and an indolocarbazolyl group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C1-C60 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, an indolocarbazolyl group, -Si(Q31)(Q32)(Q33), -N(Q31)(Q32), - B(Q31)(Q32), -C(=O)(Q31), -S(=O)2(Q31), and -P(=O)(Q31)(Q32); and

-Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and - P(=O)(Q1)(Q2), and

Q1 to Q3 and Q31 to Q33 may each independently be selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 (e.g. C1-C20) alkyl group, a C2-C60 (e.g. C2-C20) alkenyl group, a C2-C60 (e.g. C2-C20) alkynyl group, a C1-C60 (e.g. C1-C20) alkoxy group, a C3-C18 cycloalkyl group, a C1-C18 heterocycloalkyl group, a C3-C18 cycloalkenyl group, a C1-C18 heterocycloalkenyl group, a C6-C60 (e.g. C6-C30) aryl group, a C6-C60 (e.g. C6-C30) aryloxy group, a C6-C60 (e.g. C6-C30) arylthio group, a C1-C60 (e.g. C1-C20) heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C1-C60 (e.g. C1-C20) alkyl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C60 (e.g. C1-C20) alkyl group, a phenyl group, and a biphenyl group, a C6-C60 (e.g. C6-C30) aryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C18 alkyl group, a phenyl group, and a biphenyl group, and a C1-C60 (e.g. C1-C20) heteroaryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C18 alkyl group, a phenyl group, and a biphenyl group.



[0029] For example, R1 and R2 may each independently be selected from:

hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, a tert-pentyl group, a neo-pentyl group, an isopentyl group, a sec-pentyl group, a 3-pentyl group, a sec-isopentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a naphthyl group, a pyridinyl group, and a pyrimidinyl group; and

a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, a tert-pentyl group, a neo-pentyl group, an isopentyl group, a sec-pentyl group, a 3-pentyl group, a sec-isopentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a naphthyl group, a pyridinyl group, and a pyrimidinyl group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, - CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a naphthyl group, a pyridinyl group, and a pyrimidinyl group,

but embodiments of the present disclosure are not limited thereto.



[0030] For example, R3 and R4 may each independently be selected from:

hydrogen, deuterium, -F, -Cl, -Br, -I, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, a tert-pentyl group, a neo-pentyl group, an isopentyl group, a sec-pentyl group, a 3-pentyl group, a sec-isopentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, and a tert-hexyl group; and

a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, a tert-pentyl group, a neo-pentyl group, an isopentyl group, a sec-pentyl group, a 3-pentyl group, a sec-isopentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, and a tert-hexyl group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, and -I,

but embodiments of the present disclosure are not limited thereto.



[0031] For example, R31 to R33 and R41 to R43 may each independently be selected from:

hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, a tert-pentyl group, a neo-pentyl group, an isopentyl group, a sec-pentyl group, a 3-pentyl group, a sec-isopentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, and a tert-hexyl group;

a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, a tert-pentyl group, a neo-pentyl group, an isopentyl group, a sec-pentyl group, a 3-pentyl group, a sec-isopentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, and a tert-hexyl group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a naphthyl group, a pyridinyl group, and a pyrimidinyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyridinyl group, and a pyrimidinyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyridinyl group, and a pyrimidinyl group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, a tert-pentyl group, a neo-pentyl group, an isopentyl group, a sec-pentyl group, a 3-pentyl group, a sec-isopentyl group, an n-hexyl group, an isohexyl group, a sec-hexyl group, a tert-hexyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyridinyl group, and a pyrimidinyl group,

but embodiments of the present disclosure are not limited thereto.



[0032] In Formula 1-1, a1 and a2 are each independently an integer from 1 to 10, wherein, when a1 is 2 or more, two or more R1(s) may be identical to each other or different from each other, and when a2 is 2 or more, two or more R2(s) may be identical to or different from each other.

[0033] In Formula 1-1, n is an integer from 2 to 6.

[0034] In one embodiment, n may be an integer from 3 to 6 or an integer from 4 to 6.

[0035] * indicates a binding site to metal M,

[0036] In one embodiment, L1 may be a ligand represented by Formula 1-1A below:



[0037] In Formula 1-1A,
Y1, Y2, Y3, Y4, n, R3, R4, R31, R32, R33, R41, R42, and R43 are each the same as described above, and R1a, R1b, and R1c are each independently the same as described in connection with R1. Additionally, R2a, R2b, and R2c are each independently the same as described in connection with R2, and R32 and R42 are each independently the same as described above and are identical to each other.

[0038] In one embodiment, R31, R33, R41, and R43 in Formula 1-1 A may each be hydrogen.

[0039] In one embodiment, R1a, R1c, R2a, and R2c in Formula 1-1A may each independently be selected from:

hydrogen, deuterium, -F, -Cl, -Br, -I, a cyano group, and a C1-C18 alkyl group;

a C1-C18 alkyl group substituted with at least one selected from deuterium, - F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, and a cyano group;

a cyclopentyl group, a cyclohexyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, and a biphenyl group; and

a cyclopentyl group, a cyclohexyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, and a biphenyl group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, a cyano group, a C1-C18 alkyl group, a cyclopentyl group, a cyclohexyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, and a biphenyl group,

but embodiments of the present disclosure are not limited thereto.



[0040] For example, R1a and R2a may be identical to each other, and R1c and R2c may be different from each other. For example, R1a and R1c may be identical to each other, and R2a and R2c may be different from each other.

[0041] In one embodiment, R1b and R2b in Formula 1-1 A may each be hydrogen.

[0042] In one embodiment, L2 in Formula 1 may be a ligand represented by Formula 1-2A or 1-2B below:





[0043] In Formulae 1-2A and 1-2B,
A3 and A4 are each independently selected from a C5-C30 (e.g. C5-C20) carbocyclic group and a C1-C30 (e.g. C1-C20) heterocyclic group,
Y5 is C or N,
X51 is C or N,
R5, R6, R7, R8, and R9 are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) alkyl group, a substituted or unsubstituted C2-C60 (e.g. C2-C20) alkenyl group, a substituted or unsubstituted C2-C60 (e.g. C2-C20) alkynyl group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C18 heterocycloalkyl group, a substituted or unsubstituted C3-C18 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 (e.g. C6-C30) aryl group, a substituted or unsubstituted C7-C60 (e.g. C7-C30) alkylaryl group, a substituted or unsubstituted C6-C60 (e.g. C6-C30) aryloxy group, a substituted or unsubstituted C6-C60 (e.g. C6-C30) arylthio group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) heteroaryl group, a substituted or unsubstituted C2-C60 (e.g. C2-C20) alkylheteroaryl group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) heteroaryloxy group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and - P(=O)(Q1)(Q2),
a5 is an integer from 0 to 10, and
a9 is an integer from 1 to 10.

[0044] In one embodiment, in Formulae 1-2A and 1-2B, ring A3 and A4 may each independently be selected from i) a first ring, ii) a second ring, iii) a condensed ring in which two or more first rings are condensed with each other (e.g., combined together), iv) a condensed ring in which two or more second rings are condensed with each other (e.g., combined together), and v) a condensed ring in which one or more first rings and one or more second rings are condensed with each other (e.g., combined together),
the first ring may be selected from a cyclopentane group, a cyclopentene group, a cyclopentadiene group, a furan group, a thiophene group, a pyrrole group, a borole group, a phosphole group, a silole group, a germole group, a selenophene group, an oxazole group, an isoxazole group, an oxadiazole group, an isoxadiazole group, an oxatriazole group, an isoxatriazole group, a thiazole group, an isothiazole group, a thiadiazole group, an isothiadiazole group, a thiatriazole group, an isothiatriazole group, a pyrazole group, an imidazole group, a triazole group, a tetrazole group, an azasilole group, a diazasilole group, and a triazasilole group, and
the second ring may be selected from a cyclohexane group, a cyclohexene group, a cyclohexadiene group, an adamantane group, a norbornane group, a norbornene group, a benzene group, a pyridine group, a dihydropyridine group, a tetrahydropyridine group, a pyrimidine group, a dihydropyrimidine group, a tetrahydropyrimidine group, a pyrazine group, a dihydropyrazine group, a tetrahydropyrazine group, a pyridazine group, a dihydropyridazine group, a tetrahydropyridazine group, a triazine group, an oxasiline group, a thiasiline group, a dihydroazasiline group, a dihydrodisiline group, a dihydrosiline group, a dioxine group, an oxathiine group, an oxazine group, a pyran group, a dithiine group, a thiazine group, and a thiopyran group, but embodiments of the present disclosure are not limited thereto.

[0045] For example, ring A3 and ring A4 may each independently be selected from a benzene group, a naphthalene group, an indene group, a benzofuran group, a benzothiophene group, an indole group, a benzimidazole group a benzoxazole group, a benzoisoxazole group, a benzothiazole group, a benzoisothiazole group, a quinoline group, an isoquinoline group, a quinoxaline group, a phthalazine group, a quinazoline group, a cinnoline group, a pyridine group, a pyrimidine group, and a pyrazine group, but embodiments of the present disclosure are not limited thereto.

[0046] In one embodiment, X51 and Y5 in Formulae 1-2A and 1-2B may each be C.

[0047] In one embodiment, R5, R6, R7, R8, and R9 in Formulae 1-2A and 1-2B may each independently be selected from:

hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 (e.g. C1-C20) alkyl group, and a C1-C60 (e.g. C1-C20) alkoxy group;

a C1-C60 (e.g. C1-C20) alkyl group and a C1-C60 (e.g. C1-C20) alkoxy group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, - CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a pyridinyl group, and a pyrimidinyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, and an indolocarbazolyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, and an indolocarbazolyl group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 (e.g. C1-C20) alkyl group, a C1-C60 (e.g. C1-C20) alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, an indolocarbazolyl group, - Si(Q31)(Q32)(Q33), -N(Q31)(Q32), -B(Q31)(Q32), -C(=O)(Q31), -S(=O)2(Q31), and - P(=O)(O31)(O32); and

-Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and - P(=O)(Q1)(Q2), and

Q1 to Q3 and Q31 to Q33 may each independently be selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 (e.g. C1-C20) alkyl group, a C2-C60 (e.g. C2-C20) alkenyl group, a C2-C60 (e.g. C2-C20) alkynyl group, a C1-C60 (e.g. C1-C20) alkoxy group, a C3-C10 cycloalkyl group, a C1-C18 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C18 heterocycloalkenyl group, a C6-C60 (e.g. C6-C30) aryl group, a C6-C60 (e.g. C6-C30) aryloxy group, a C6-C60 (e.g. C6-C30) arylthio group, a C1-C60 (e.g. C1-C20) heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C1-C60 (e.g. C1-C20) alkyl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C60 (e.g. C1-C20) alkyl group, a phenyl group, and a biphenyl group, a C6-C60 aryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C18 alkyl group, a phenyl group, and a biphenyl group, and a C1-C60 (e.g. C1-C20) heteroaryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C18 alkyl group, a phenyl group, and a biphenyl group, but embodiments of the present disclosure are not limited thereto.



[0048] For example, R5, R6, R7, R8, and R9 in Formulae 1-2A and 1-2B may each independently be selected from:

hydrogen, deuterium, -F, -Cl, -Br, -I, a cyano group, a C1-C18 alkyl group, and a C1-C18 alkoxy group; and

a C1-C18 alkyl group and a C1-C18 alkoxy group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, - CFH2, a cyano group, a phenyl group, a biphenyl group, and a terphenyl group, but embodiments of the present disclosure are not limited thereto.



[0049] For example, R5, R6, R7, R8, and R9 in Formulae 1-2A and 1-2B may each independently be selected from:

hydrogen, deuterium, -F, cyano group, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, and a tert-butyl group; and

a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, and a tert-butyl group, each substituted with at least one selected from deuterium, -F, and a cyano group, but embodiments of the present disclosure are not limited thereto.



[0050] In one embodiment, L2 represented by Formula 1-2B may be a ligand represented by Formula 1-2B-1 below:



[0051] In Formula 1-2B-1, A3, X51, Y5, R5, R6, and a5 are each the same as described above,
X61 is C(R61) or N, X62 is C(R62) or N, X63 is C(R63) or N, X64 is C(R64) or N, and
R61, R62, R63, and R64 are each independently the same as described in connection with R9.

[0052] In one embodiment, the organometallic compound represented by Formula 1 may be selected from Compounds BD1 to BD36 below:







[0053] Another aspect of an embodiment of the present disclosure provides an organic light-emitting device including: a first electrode; a second electrode; and an organic layer between the first electrode and the second electrode and including an emission layer,
wherein the organic layer includes the organometallic compound.

[0054] In one embodiment, the emission layer may include the organometallic compound.

[0055] In one embodiment, the emission layer may further include a second compound and a third compound, wherein the organometallic compound, the second compound, and the third compound are different from each other, the second compound and the third compound form an exciplex, and the organometallic compound and at least one of the second compound and the third compound may not form an exciplex.

[0056] The organometallic compound is a six-coordinate complex so that the exciplex formation with an organic compound may be suppressed or reduced, thereby improving color purity and luminescence efficiency of the organometallic compound.

[0057] In one embodiment, the second compound may be represented by Formula 2 below, and
the third compound may include a group represented by Formula 3 below:







[0058] In Formulae 2 and 3, ring CY51 to ring CY53, ring CY71, and ring CY72 are each independently selected from a C5-C30 carbocyclic group and a C1-C30 heterocyclic group. For example, ring CY51 to ring CY53, ring CY71, and ring CY72 may each independently be selected from a C5-C20 carbocyclic group and a C1-C20 heterocyclic group.

[0059] In one embodiment, ring CY51 to ring CY53, ring CY71, and CY72 in Formulae 2 and 3 may each independently be i) a first ring, ii) a second ring, iii) a condensed ring in which two or more first rings are condensed with each other (e.g., combined together), iv) a condensed ring in which two or more second rings are condensed with each other (e.g., combined together), or v) a condensed ring in which one or more first rings and one or more second rings are condensed with each other (e.g., combined together),
the first ring may be selected from a cyclopentane group, a cyclopentadiene group, a furan group, a thiophene group, a pyrrole group, a silole group, an oxazole group, an isoxazole group, an oxadiazole group, an isoxadiazole group, an oxatriazole group, an isoxatriazole group, a thiazole group, an isothiazole group, a thiadiazole group, an isothiadiazole group, a thiatriazole group, an isothiatriazole group, a pyrazole group, an imidazole group, a triazole group, a tetrazole group, an azasilole group, a diazasilole group, and a triazasilole group, and
the second ring is selected from an adamantane group, a norbornane group, a norbornene group, a cyclohexane group, a cyclohexene group, a benzene group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, an oxasiline group, a thiasiline group, a dihydroazasiline group, a dihydrodisiline group, a dihydrosiline group, a dioxine group, an oxathiine group, an oxazine group, a pyran group, a dithiine group, a thiazine group, a thiopyran group, a cyclohexadiene group, a dihydropyridine group, and a dihydropyrazine group.

[0060] For example, in Formulae 2 and 3, ring CY51 to ring CY53, ring CY71, and ring CY72 may each independently be selected from a benzene group, a naphthalene group, an anthracene group, a phenanthrene group, a triphenylene group, a pyrene group, a chrysene group, a cyclopentadiene group, a 1,2,3,4-tetrahydronaphthalene group, a thiophene group, a furan group, an indole group, a benzoborole group, a benzophosphole group, an indene group, a benzosilole group, a benzogermole group, a benzothiophene group, a benzoselenophene group, a benzofuran group, a carbazole group, a dibenzoborole group, a dibenzophosphole group, a fluorene group, a dibenzosilole group, a dibenzogermole group, a dibenzothiophene group, a dibenzoselenophene group, a dibenzofuran group, a dibenzothiophene 5-oxide group, a 9H-fluorene-9-one group, a dibenzothiophene 5,5-dioxide group, an azaindole group, an azabenzoborole group, an azabenzophosphole group, an azaindene group, an azabenzosilole group, an azabenzogermole group, an azabenzothiophene group, an azabenzoselenophene group, an azabenzofuran group, an azacarbazole group, an azadibenzoborole group, an azadibenzophosphole group, an azafluorene group, an azadibenzosilole group, an azadibenzogermole group, an azadibenzothiophene group, an azadibenzoselenophene group, an azadibenzofuran group, an azadibenzothiophene 5-oxide group, an aza-9H-fluorene-9-one group, an azadibenzothiophene 5,5-dioxide group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazoline group, a phenanthroline group, a pyrrole group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isoxazole group, a thiazole group, an isothiazole group, an oxadiazole group, a thiadiazole group, a benzopyrazole group, a benzimidazole group, a benzoxazole group, a benzothiazole group, a benzoxadiazole group, a benzothiadiazole group, a 5,6,7,8-tetrahydroisoquinoline group, and a 5,6,7,8-tetrahydroquinoline group, but embodiments of the present disclosure are not limited thereto.

[0061] In Formula 2, L51 to L53 are each independently selected from a substituted or unsubstituted C5-C30 carbocyclic group and a substituted or unsubstituted C1-C30 heterocyclic group. For example, in Formulae 2-1 and 2-2, L51 to L53 may each independently be selected from a substituted or unsubstituted C5-C20 carbocyclic group and a substituted or unsubstituted C1-C20 heterocyclic group.

[0062] In one embodiment, L51 to L53 in Formula 2 may each independently be selected from: a benzene group, a naphthalene group, an anthracene group, a phenanthrene group, a triphenylene group, a pyrene group, a chrysene group, a cyclopentadiene group, a furan group, a thiophene group, a silole group, an indene group, a fluorene group, an indole group, a carbazole group, a benzofuran group, a dibenzofuran group, a benzothiophene group, a dibenzothiophene group, a benzosilole group, a dibenzosilole group, an azafluorene group, an azacarbazole group, an azadibenzofuran group, an azadibenzothiophene group, an azadibenzosilole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazoline group, a phenanthroline group, a pyrrole group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isooxazole group, a thiazole group, an isothiazole group, an oxadiazole group, a thiadiazole group, a benzopyrazole group, a benzimidazole group, a benzoxazole group, a benzothiazole group, a benzoxadiazole group, and a benzothiadiazole group;
a benzene group, a naphthalene group, an anthracene group, a phenanthrene group, a triphenylene group, a pyrene group, a chrysene group, a cyclopentadiene group, a furan group, a thiophene group, a silole group, an indene group, a fluorene group, an indole group, a carbazole group, a benzofuran group, a dibenzofuran group, a benzothiophene group, a dibenzothiophene group, a benzosilole group, a dibenzosilole group, an azafluorene group, an azacarbazole group, an azadibenzofuran group, an azadibenzothiophene group, an azadibenzosilole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazoline group, a phenanthroline group, a pyrrole group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isooxazole group, a thiazole group, an isothiazole group, an oxadiazole group, a thiadiazole group, a benzopyrazole group, a benzimidazole group, a benzoxazole group, a benzothiazole group, a benzoxadiazole group, and a benzothiadiazole group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C20 (e.g. C1-C18) alkyl group, a C1-C20 (e.g. C1-C18) alkoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, a fluorenyl group, a dimethylfluorenyl group, a diphenylfluorenyl group, a carbazolyl group, a phenylcarbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a dimethyldibenzosilolyl group, a diphenyldibenzosilolyl group, -Si(Q31)(Q32)(Q33), - N(Q31)(Q32), -B(Q31)(Q32), -C(=O)(Q31), -S(=O)2(Q31), and -P(=O)(Q31)(Q32); and
*-C(Q31)(Q32)-*', *-Si(Q31)(Q32)-*', *-N(Q31)-*', *-B(Q31)-*', *-C(=O)-*', *-S(=O)2-*', and *-P(=O)(Q31)-*',
Q31 to Q33 may each independently be selected from hydrogen, deuterium, a C1-C20 (e.g. C1-C18) alkyl group, a C1-C20 (e.g. C1-C18) alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, a pyrazinyl group, and a triazinyl group, but embodiments of the present disclosure are not limited thereto, and
* and *' each indicate a binding site to an adjacent atom.

[0063] In Formulae 2 and 3, a bond between L51 and ring CY51, a bond between L52 and ring CY52, a bond between L53 ring CY53, a bond between two or more L51(s), a bond between two or more L52(s), a bond between two or more L53(s), a bond between L51 and carbon between X54 and X55 in Formula 2, a bond between L52 and carbon between X54 and X56 in Formula 2, and a bond between L53 and carbon between X55 and X56 in Formula 2 may each be a carbon-carbon single bond.

[0064] In Formula 2, b51 to b53 are each independently an integer from 0 to 5, wherein, when b51 is 0, *-(L51)b51-*' is a single bond, when b52 is 0, *-(L52)b52-*' is a single bond, and when b53 is 0, *-(L53)b53-*' is a single bond,

[0065] For example, b51 to b53 may each independently be 0, 1, or 2.

[0066] In Formula 2, X54 is N or C(R54), X55 is N or C(R55), X56 is N or C(R56), and at least one selected from X54 to X56 is N, and R54 to R56 are each independently the same as described in the detailed description.

[0067] In Formula 3, X81 is a single bond, O, S, N(R81), B(R81), C(R81a)(R81b), or Si(R81a)(R81b). R81, R81a, and R81b are each independently the same as described in the detailed description.

[0068] In Formulae 2 and 3, R51 to R56, R71, R72, R81, R81a, and R81b are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) alkyl group, a substituted or unsubstituted C2-C60 (e.g. C2-C20) alkenyl group, a substituted or unsubstituted C2-C60 (e.g. C2-C20) alkynyl group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) alkoxy group, a substituted or unsubstituted C3-C18 cycloalkyl group, a substituted or unsubstituted C1-C18 heterocycloalkyl group, a substituted or unsubstituted C3-C18 cycloalkenyl group, a substituted or unsubstituted C1-C18 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 (e.g. C6-C30) aryl group, a substituted or unsubstituted C7-C60 (e.g. C7-C30) alkylaryl group, a substituted or unsubstituted C6-C60 (e.g. C6-C30) aryloxy group, a substituted or unsubstituted C6-C60 (e.g. C6-C30) arylthio group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) heteroaryl group, a substituted or unsubstituted C2-C60 (e.g. C2-C20) alkylheteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, - Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and -P(=O)(Q1)(Q2), and Q1 to Q3 may each be the same as described elsewhere in the present specification.

[0069] In one embodiment, R51 to R56, R71, R72, R81, R81a, and R81b in Formulae 2 and 3 may each independently be selected from:

hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 (e.g. C1-C20) alkyl group, and a C1-C60 (e.g. C1-C20) alkoxy group;

a C1-C60 (e.g. C1-C20) alkyl group and a C1-C60 (e.g. C1-C20) alkoxy group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, - CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a naphthyl group, a pyridinyl group, and a pyrimidinyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, and an indolocarbazolyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, an indolocarbazolyl group, and a group represented by Formula 91, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 (e.g. C1-C20) alkyl group, a C1-C60 (e.g. C1-C20) alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, an indolocarbazolyl group, -Si(Q31)(Q32)(Q33), -N(Q31)(Q32), -B(Q31)(Q32), -C(=O)(Q31), - S(=O)2(Q3i), and -P(=O)(Q31)(Q32); and

-Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and - P(=O)(Q1)(Q2), and

Q1 to Q3 and Q31 to Q33 may each independently be selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 (e.g. C1-C20) alkyl group, a C2-C60 (e.g. C2-C20) alkenyl group, a C2-C60 (e.g. C2-C20) alkynyl group, a C1-C60 (e.g. C1-C20) alkoxy group, a C3-C18 cycloalkyl group, a C1-C18 heterocycloalkyl group, a C3-C18 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 (e.g. C6-C30) aryl group, a C6-C60 (e.g. C6-C30) aryloxy group, a C6-C60 (e.g. C6-C30) arylthio group, a C1-C60 (e.g. C1-C20) heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C1-C60 (e.g. C1-C20) alkyl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C60 (e.g. C1-C20) alkyl group, a phenyl group, and a biphenyl group, a C6-C60 (e.g. C6-C30) aryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C18 alkyl group, a phenyl group, and a biphenyl group, and a C1-C60 (e.g. C1-C20) heteroaryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C18 alkyl group, a phenyl group, and a biphenyl group, but embodiments of the present disclosure are not limited thereto:



[0070] In Formula 91,
ring CY91 and ring CY92 are each independently selected from a C5-C30 (e.g. C5-C20) carbocyclic group and a C1-C30 (e.g. C1-C20) heterocyclic group,
X91 is a single bond, O, S, N(R91), B(R91), C(R91a)(R91b), or Si(R91a)(R91b),
R91, R91a, and R91b are each independently the same as described in connection with R81, R81a, and R81b, respectively, in the present specification, and
* indicates a binding site to a neighboring atom.

[0071] For example, in Formula 91,
ring CY91 and ring CY92 may each independently be selected from a benzene group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, and a triazine group,
R91, R91a, and R91b may each independently be selected from:
hydrogen and a C1-C18 alkyl group;
a phenyl group, a biphenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, a pyrazinyl group, and a triazinyl group; and
a phenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, a pyrazinyl group, and a triazinyl group, each substituted with at least one selected from deuterium, a C1-C18 alkyl group, a phenyl group, a biphenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, a pyrazinyl group, and a triazinyl group,
but embodiments of the present disclosure are not limited thereto.

[0072] In Formulae 2 and 3, a51 to a53, a71, and a72 indicate the number of R51 to R53, the number of R71, the number of R72, respectively, and are each independently an integer from 0 to 10. When a51 is 2 or more, two or more R51(s) may be identical to each other or different from each other, and a52, a53, a71, and a72 may each be understood in this manner.

[0073] In one embodiment, in Formula 2, a group represented by

and a group represented by

may not each be a phenyl group (or may not both be a phenyl group).

[0074] In one or more embodiments, in Formula 2, a group represented by

and a group represented by

may be identical to each other (e.g., may both be the same as each other).

[0075] In one or more embodiments, in Formula 2, ring CY51 and ring CY52 may each independently be selected from a benzene group, a pyridine group, a pyrimidine group, a pyridazine group, a pyrazine group, and a triazine group,
R51 and R52 may each independently be selected from a substituted or unsubstituted C3-C18 cycloalkyl group, a substituted or unsubstituted C1-C18 heterocycloalkyl group, a substituted or unsubstituted C3-C18 cycloalkenyl group, a substituted or unsubstituted C1-C18 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 (e.g. C6-C30) aryl group, a substituted or unsubstituted C7-C60 (e.g. C7-C30) alkylaryl group, a substituted or unsubstituted C6-C60 (e.g. C6-C30) aryloxy group, a substituted or unsubstituted C6-C60 (e.g. C6-C30) arylthio group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) heteroaryl group, a substituted or unsubstituted C2-C60 (e.g. C2-C20) alkylheteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, and -Si(Q1)(Q2)(Q3),
Q1 to Q3 may each independently be selected from a C3-C10 cycloalkyl group, a C1-C18 heterocycloalkyl group, a C3-C18 cycloalkenyl group, a C1-C18 heterocycloalkenyl group, a C6-C60 (e.g. C6-C30) aryl group, a C6-C60 (e.g. C6-C30) aryloxy group, a C6-C60 (e.g. C6-C30) arylthio group, a C1-C60 (e.g. C1-C20) heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, and a C6-C60 (e.g. C6-C30) aryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C18 alkyl group, a phenyl group, and a biphenyl group, and
a51 and a52 may each independently be 1, 2, or 3.

[0076] In one or more embodiments, in Formula 2, a moiety represented by

may be selected from groups represented by Formulae CY51 - 1 to CY51-18 below (and/or),
a moiety represented by

may be selected from groups represented by Formulae CY52-1 to CY52-18 below (and/or),
a moiety represented by

may be selected from groups represented by Formulae CY53-1 to CY53-19 below:

























[0077] In Formulae CY51-1 to CY51-18, CY52-1 to CY52-18, and CY53-1 to CY53-19,
T1 is a single bond, O, S, N(T11), B(T11), C(T11)(T12), or Si(T11)(T12),
T2 is a single bond, O, S, N(T21), B(T21), C(T21)(T22), or Si(T21)(T22),
T3 is a single bond, O, S, N(T31), B(T31), C(T31)(T32), or Si(T31)(T32),
T4 is a single bond, O, S, N(T41), B(T41), C(T41)(T42), or Si(T41)(T42),
T1 and T2 in Formulae CY51-16 and CY51-17 are not each a single bond at the same time,
T3 and T4 in Formulae CY52-16 and CY52-17 are not each a single bond at the same time,
R51a to R51g, T11, T12, T21, and T22 are each the same as described in connection with R51 in the present specification, wherein R51a to R51e are not each hydrogen,
R52a to R52i, T31, T32, T41, and T42 are each the same as described in connection with R52 in the present specification, wherein R52a to R52e are not each hydrogen,
R53a to R53g are each independently the same as described in connection with R53 in the present disclosure, wherein R53a to R53e are not each hydrogen,
Z1 to Z9 in Formulae CY52-18 and CY53-19 are each independently C or N, and
* indicates a binding site to a neighboring atom.

[0078] For example, in Formulae CY51-1 to CY51-15 and CY52-1 to 52-15, R51a to R51e and R52a to R52e may each independently be selected from:

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a C1-C18 alkylphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azafluorenyl group, an azadibenzosilolyl group, and a group represented by Formula 91;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a C1-C18 alkylphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azafluorenyl group, an azadibenzosilolyl group, and a group represented by Formula 91, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C20 (e.g. C1-C10) alkyl group, a C1-C20 (e.g. C1-C18) alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a C1-C18 alkylphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinyl group, and an imidazopyrimidinyl group; and

-C(Q1)(Q2)(Q3) and -Si(Q1)(Q2)(Q3),

Q1 to Q3 may each independently be selected from:

a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, a pyrazinyl group, and a triazinyl group; and

a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, a pyrazinyl group, and a triazinyl group, each substituted with at least one selected from deuterium, a C1-C18 alkyl group, a phenyl group, a biphenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, a pyrazinyl group, and a triazinyl group, and

in Formulae CY51-16 and CY51-17, i) T1 may be O or S, and T2 may be Si(T21)(T22), or ii) T1 may be Si(T11)(T12), and T2 may be O or S, and

in Formulae CY52-16 and CY52-17, i) T3 may be O or S, and T4 may be Si(T41)(T42), or ii) T3 may be Si(T31)(T32), and T4 may be O or S, but embodiments of the present disclosure are not limited thereto.



[0079] In one or more embodiments, the third compound may be represented by one of Formulae 3-1 to 3-5 below:









[0080] In Formulae 3-1 to 3-5,
ring CY71, ring CY72, X81, R71, R72, a71, and a72 are each independently the same as described elsewhere in the present specification,
ring CY73, ring CY74, R73, R74, a73, and a74 are each independently the same as described in connection with ring CY71, ring CY72, R71, R72, a71, and a72, respectively, in the present specification,
L81 is selected from *-C(Q4)(Q5)-*', *-Si(Q4)(Q5)-*', a substituted or unsubstituted C5-C30 (e.g. C5-C20) carbocyclic group, and a substituted or unsubstituted C1-C30 (e.g. C1-C20) heterocyclic group, wherein Q4 and Q5 are each independently the same as described in connection with Q1 in the present specification,
b81 is an integer from 0 to 5, wherein, when b81 is 0, *-(L81)b81-*' is a single bond, and when b81 is 2 or more, two or more L81(s) may be identical to or different from each other,
X82 is a single bond, O, S, N(R82), B(R82), C(R82a)(R82b), or Si(R82a)(R82b),
X83 is a single bond, O, S, N(R83), B(R83), C(R83a)(R83b), or Si(R83a)(R83b),
in Formulae 3-2 and 3-4, X82 and X83 are not each a single bond at the same time,
X84 is C or Si,
R80, R82, R83, R82a, R82b, R83a, R83b, and R84 are each independently the same as described in connection with R81 in the present specification, and
* and *' each indicate a binding site to a neighboring atom.

[0081] For example, L81 may be selected from:

*-C(Q4)(Q5)-*' and *-Si(Q4)(Q5)-*';

a benzene group, a naphthalene group, an anthracene group, a phenanthrene group, a triphenylene group, a pyrene group, a chrysene group, a cyclopentadiene group, a furan group, a thiophene group, a silole group, an indene group, a fluorene group, an indole group, a carbazole group, a benzofuran group, a dibenzofuran group, a benzothiophene group, a dibenzothiophene group, a benzosilole group, a dibenzosilole group, an azafluorene group, an azacarbazole group, an azadibenzofuran group, an azadibenzothiophene group, an azadibenzosilole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazoline group, a phenanthroline group, a pyrrole group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isoxazole group, a thiazole group, an isothiazole group, an oxadiazole group, a thiadiazole group, a benzopyrazole group, a benzimidazole group, a benzoxazole group, a benzothiazole group, a benzooxadiazole group, and a benzothiadiazole group; and

a benzene group, a naphthalene group, an anthracene group, a phenanthrene group, a triphenylene group, a pyrene group, a chrysene group, a cyclopentadiene group, a furan group, a thiophene group, a silole group, an indene group, a fluorene group, an indole group, a carbazole group, a benzofuran group, a dibenzofuran group, a benzothiophene group, a dibenzothiophene group, a benzosilole group, a dibenzosilole group, an azafluorene group, an azacarbazole group, an azadibenzofuran group, an azadibenzothiophene group, an azadibenzosilole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazoline group, a phenanthroline group, a pyrrole group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isooxazole group, a thiazole group, an isothiazole group, an oxadiazole group, a thiadiazole group, a benzopyrazole group, a benzimidazole group, a benzoxazole group, a benzothiazole group, a benzoxadiazole group, and a benzothiadiazole group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C20 (e.g. C1-C18) alkyl group, a C1-C20 (e.g. C1-C18) alkoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, a fluorenyl group, a dimethylfluorenyl group, a diphenylfluorenyl group, a carbazolyl group, a phenylcarbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a dimethyldibenzosilolyl group, a diphenyldibenzosilolyl group, -O(Q31), -S(Q31), - Si(Q31)(Q32)(Q33), -N(Q31)(Q32), -B(Q31)(Q32), -P(Q31)(Q32), -C(=O)(Q31), -S(=O)2(Q31), and -P(=O)(O31)(O32), and

Q4, Q5, and Q31 to Q33 may each independently be selected from hydrogen, deuterium, a C1-C20 (e.g. C1-C18) alkyl group, a C1-C20 (e.g. C1-C10) alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, a pyrazinyl group, and a triazinyl group, but embodiments of the present disclosure are not limited thereto.



[0082] For example, a moiety represented by

in Formulae 3-1 and 3-2 may be selected from groups represented by Formulae CY71-1(1) to CY71-1 (8) below,
a moiety represented by

in Formulae 3-1 and 3-3 may be selected from groups represented by Formulae CY71-2(1) to CY71-2(8) below,
a moiety represented by

in Formulae 3-2 and 3-4 may be selected from groups represented by Formulae CY71-3(1) to CY71-3(32) below,
a moiety represented by

in Formulae 3-3 to 3-5 may be selected from groups represented by Formulae CY71-4(1) to CY71-4(32) below, and
a moiety represented by

in Formula 3-5 may be selected from groups represented by Formulae CY71-5(1) to CY71-5(8), but embodiments of the present disclosure are not limited thereto:













































[0083] In Formulae CY71-1(1) to CY71-1(8), CY71-2(1) to CY71-2(8), CY71-3(1) to CY71-3(32), CY71-4(1) to CY71-4(32), and CY71-5(1) to CY71-5(8),
X81 to X84, R80, and R84 are each independently the same as described elsewhere in the present specification,
X85 is a single bond, O, S, N(R85), B(R85), C(R85a)(R85b), or Si(R85a)(R85b),
X86 is a single bond, O, S, N(R86), B(R86), C(R86a)(R86b), or Si(R86a)(R86b),
in Formulae CY71-1(1) to CY71-1(8) and CY71-4(1) to CY71-4(32), X85 and X86 are not each a single bond at the same time,
X87 is a single bond, O, S, N(R87), B(R87), C(R87a)(R87b), or Si(R87a)(R87b),
X88 is a single bond, O, S, N(R88), B(R88), C(R88a)(R88b), or Si(R88a)(R88b),
in Formulae CY71-2(1) to CY71-2(8), CY71-3(1) to CY71-3(32), and CY71-5(1) to CY71-5(8), X87 and X88 are not each a single bond at the same time, and
R85 to R88, R85a, R85b, R86a, R86b, R87a, R87b, R88a, and R88b are each independently the same as described in connection with R81 in the present specification.

[0084] In one embodiment, the second compound may be selected from Compounds ETH1 to ETH80 below:



































[0085] In one or more embodiments, the third compound may be selected from Compounds HTH1 to HTH28 below:











[0086] In one embodiment, the organic light-emitting device may satisfy at least one of <Condition 1> to <Condition 4> below:

Condition 1
LUMO energy level (eV) of the third compound > LUMO energy level (eV) of the organometallic compound

Condition 2
LUMO energy level (eV) of the organometallic compound > LUMO energy level (eV) of the second compound

Condition 3
HOMO energy level (eV) of the organometallic compound > HOMO energy level (eV) of the third compound

Condition 4
HOMO energy level (eV) of the third compound > HOMO energy level (eV) of the second compound



[0087] The HOMO energy levels and the LUMO energy levels of each of the organometallic compound, the second compound, and the third compound may be negative values, and may be measured according to any suitable method such as, for example, a method described in Evaluation Example 1 in the present specification.

[0088] In one or more embodiments, an absolute value of the difference between the LUMO energy level of the organometallic compound and the LUMO energy level of the second compound may be 0.1 eV or more and 1.0 eV or less, an absolute value of the difference between the LUMO energy level of the organometallic compound and the LUMO energy level of the third compound may be 0.1 eV or more and 1.0 eV or less, an absolute value of the difference between the HOMO energy level of the organometallic compound and the HOMO energy level of the second compound may be 1.25 eV or less (for example, 1.25 eV or less and 0.2 eV or more), an absolute value of the difference between the HOMO energy level of the organometallic compound and the HOMO energy level of the third compound may be 1.25 eV or less (for example, 1.25 eV or less and 0.2 eV or more), and an absolute value of the difference between the HOMO energy level of the organometallic compound and the HOMO energy level of the exciplex formed between the second compound and the third compound may be 1.25 eV or less.

[0089] When the relationships between LUMO energy levels and HOMO energy levels satisfy the conditions as described above, balance between holes and electrons injected into the emission layer may be achieved.

[0090] The emission layer of the organic light-emitting device may include:
  1. 1) the organometallic compound represented by Formula 1 (Formula 1 includes a tetradentate ligand and a bidentate ligand, and M in Formula 1 is a transition metal);
  2. 2) the second compound represented by Formula 2 (wherein, in Formula 2, a bond between L51 and ring CY51, a bond between L52 and ring CY52, a bond between L53 and ring CY53, a bond between two or more L51(s), a bond between two or more L52(s), a bond between two or more L53(s), a bond between L51 and carbon between X54 and X55 in Formula 2, a bond between L52 and carbon between X54 and X56 in Formula 2, and a bond between L53 and carbon between X55 and X56 in Formula 2 may each be a "carbon-carbon" single bond); and
  3. 3) the third compound represented by Formula 3 which is different from Formulae 1 and 2,
    and accordingly, the exciplex formation between the organometallic compound and either the second compound or the third compound is effectively suppressed or reduced, thereby implementing the organometallic compound having high luminescence efficiency, high color purity, and a long lifespan (e.g., the organic light-emitting device including the organometallic compound in the emission layer may have high luminescence efficiency, high color purity, and a long lifespan).


[0091] The decay time of delayed fluorescence in the time-resolved electroluminescence (TREL) spectrum of the organic light emitting device may be 50 ns or more, for example, 50 ns or more and 2.5 µs or less. In one embodiment, the decay time of delayed fluorescence in the TREL spectrum of the organic light-emitting device may be 50 ns or more and 2.4 µs or less, 50 ns or more and 2.3 µs or less, 50 ns or more and 2.2 µs or less, 50 ns or more and 2.1 µs or less, or 50 ns or more and 2 µs or less. When the decay time of delayed fluorescence of the organic light-emitting device is within these ranges, the time that the organometallic compound remains in an excited state is relatively reduced, so that the organic light-emitting device may have high luminescence efficiency and a long lifespan.

[0092] In one embodiment, the EL spectrum of the organic light-emitting device may have a first peak and a second peak, wherein a maximum emission wavelength of the second peak may be greater than that of the first peak, a difference between the maximum emission wavelength of the second peak and the maximum emission wavelength of the first peak may be 5 nm or more and 10 nm or less, and an intensity of the second peak may be smaller than that of the first peak. When the difference between the maximum emission wavelength of the second peak and the maximum emission wavelength of the first peak is within the range above, the organic light-emitting device has excellent color purity (for example, a blue organic light-emitting device having excellent color purity).

[0093] The maximum emission wavelength of the first peak may be 390 nm or more and 500 nm or less (for example, 430 nm or more and 470 nm or less). In this regard, the organic light-emitting device may emit blue (for example, dark blue) light having excellent color purity.

[0094] The first peak and the second peak may each be an emission peak of phosphorescence emitted from the organometallic compound.

[0095] The organometallic compound includes a tetradentate ligand and a bidentate ligand, and has an octahedral structure, and accordingly, the exciplex formation between the organometallic compound and either the second compound or the third compound may be suppressed or reduced, thereby achieving high efficiency and high color purity of the organometallic compound (e.g., the organic light-emitting device including the organometallic compound in the emission layer may have high efficiency and high color purity).

[0096] The intensity of the second peak may be 20% to 90% of the intensity of the first peak. When the intensity of each of the second peak and the first peak is within the ranges above, the light emission by the second peak may be suppressed by the organometallic compound while the efficiency of phosphorescence emitted from the first compound is not reduced, thereby implementing the organic light-emitting device having improved color purity.

[0097] Another aspect of an embodiment of the present disclosure provides an organic light-emitting device including:

the first electrode;

the second electrode facing the first electrode; and

the emission layer between the first electrode and the second electrode,

wherein the emission layer includes the organometallic compound, the second compound, and the third compound,

the organometallic compound, the second compound, and the third compound are different from each other,

the amount of the organometallic compound is smaller than the total amount of the second compound and the third compound,

the organometallic compound is a six-coordinate organometallic compound having an octahedral structure,

the second compound includes at least one group selected from a pyridine group, a pyrimidine group, a pyridazine group, a pyrazine group, a triazine group, and a tetrazine group, and

the organometallic compound and either the second compound or the third compound does not form an exciplex.



[0098] In addition, the decay time of delayed fluorescence in the TREL spectrum of the organic light-emitting device may be 50 ns or more (for example, 50 ns or more and 2.5 µs or less, in one embodiment, 50 ns or more and 2.4 µs or less, 50 ns or more and 2.3 µs or less, 50 ns or more and 2.2 µs or less, 50 ns or more and 2.1 µs or less, or 50 ns or more and 2 µs or less). When the decay time of delayed fluorescence of the organic light-emitting device is within these ranges, the time that the organometallic compound remains in an excited state is relatively reduced, so that the organic light-emitting device may have high luminescent efficiency and a long lifespan.

[0099] The organometallic compound, the second compound, and the third compound may each be the same as described above.

[0100] Another aspect of an embodiment of the present disclosure provides an electronic apparatus including the organic light-emitting device. The electronic apparatus may further include a thin-film transistor. For example, the electronic apparatus may further include a thin-film transistor including a source electrode and a drain electrode, wherein the first electrode of the organic light-emitting device is electrically coupled to the source electrode or the drain electrode.

Description of FIG. 1



[0101] FIG. 1 is a schematic cross-sectional view of an organic light-emitting device 10 according to an embodiment. The organic light-emitting device 10 includes a first electrode 110, an organic layer 150, and a second electrode 190.

[0102] Hereinafter, the structure of the organic light-emitting device 10 according to an embodiment and a method of manufacturing the organic light-emitting device 10 will be described in connection with FIG. 1.

First electrode 110



[0103] In FIG. 1, a substrate may be additionally located under the first electrode 110 or above the second electrode 190. The substrate may be a glass substrate and/or a plastic substrate, each having excellent mechanical strength, thermal stability, transparency, surface smoothness, ease of handling, and/or water resistance.

[0104] The first electrode 110 may be formed by, for example, depositing or sputtering a material for forming the first electrode 110 on the substrate. When the first electrode 110 is an anode, the material for forming the first electrode 110 may be selected from materials having a high work function to facilitate hole injection.

[0105] The first electrode 110 may be a reflective electrode, a semi-transmissive electrode, or a transmissive electrode. When the first electrode 110 is a transmissive electrode, the material for forming the first electrode 110 may be selected from indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO2), zinc oxide (ZnO), and any combination thereof, but embodiments of the present disclosure are not limited thereto. In one or more embodiments, when the first electrode 110 is a semi-transmissive electrode or a reflective electrode, the material for forming the first electrode 110 may be selected from magnesium (Mg), silver (Ag), aluminium (Al), aluminium-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag), and any combination thereof, but embodiments of the present disclosure are not limited thereto.

[0106] The first electrode 110 may have a single-layered structure or a multi-layered structure including two or more layers. For example, the first electrode 110 may have a three-layered structure of ITO/Ag/ITO, but the structure of the first electrode 110 is not limited thereto.

Organic layer 150



[0107] The organic layer 150 is located on the first electrode 110. The organic layer 150 may include the emission layer.

[0108] The organic layer 150 may include a hole transport region between the first electrode 110 and the emission layer and an electron transport region between the emission layer and the second electrode 190.

Hole transport region in organic layer 150



[0109] The hole transport region may have i) a single-layered structure including a single layer including a single material, ii) a single-layered structure including a single layer including a plurality of different materials, or iii) a multi-layered structure having a plurality of layers including a plurality of different materials.

[0110] The hole transport region may include at least one layer selected from a hole injection layer, a hole transport layer, an emission auxiliary layer, and an electron blocking layer.

[0111] For example, the hole transport region may have a single-layered structure including a single layer including a plurality of different materials, or a multi-layered structure having a hole injection layer/hole transport layer structure, a hole injection layer/hole transport layer/emission auxiliary layer structure, a hole injection layer/emission auxiliary layer structure, a hole transport layer/emission auxiliary layer structure, or a hole injection layer/hole transport layer/electron blocking layer structure, wherein for each structure, constituting layers are sequentially stacked from the first electrode 110 in this stated order, but the structure of the hole transport region is not limited thereto.

[0112] The hole transport region may include at least one selected from m-MTDATA, TDATA, 2-TNATA, NPB(NPD), β-NPB, TPD, spiro-TPD, spiro-NPB, methylated-NPB, TAPC, HMTPD, 4,4',4"-tris(N-carbazolyl)triphenylamine (TCTA), polyaniline/dodecylbenzenesulfonic acid (PANI/DBSA), poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS), polyaniline/camphor sulfonic acid (PANI/CSA), polyaniline/poly(4-styrenesulfonate) (PANI/PSS), a compound represented by Formula 201 below, and a compound represented by Formula 202 below:













[0113] In Formulae 201 and 202,
L201 to L204 may each independently be selected from a substituted or unsubstituted C3-C10 cycloalkylene group, a substituted or unsubstituted C1-C10 heterocycloalkylene group, a substituted or unsubstituted C3-C18 cycloalkenylene group, a substituted or unsubstituted C1-C10 heterocycloalkenylene group, a substituted or unsubstituted C6-C60 (e.g. C6-C32) arylene group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) heteroarylene group, a substituted or unsubstituted divalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted divalent non-aromatic condensed heteropolycyclic group,
L205 may be selected from *-O-*', *-S-*', *-N(Q201)-*', a substituted or unsubstituted C1-C20 alkylene group, a substituted or unsubstituted C2-C20 alkenylene group, a substituted or unsubstituted C3-C10 cycloalkylene group, a substituted or unsubstituted C1-C10 heterocycloalkylene group, a substituted or unsubstituted C3-C10 cycloalkenylene group, a substituted or unsubstituted C1-C10 heterocycloalkenylene group, a substituted or unsubstituted C6-C60 (e.g. C6-C32) arylene group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) heteroarylene group, a substituted or unsubstituted divalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted divalent non-aromatic condensed heteropolycyclic group,
xa1 to xa4 may each independently be an integer from 0 to 3,
xa5 may be an integer from 1 to 10, and
R201 to R204 and Q201 may each independently be selected from a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C18 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 (e.g. C6-C32) aryl group, a substituted or unsubstituted C6-C60 (e.g. C6-C32) aryloxy group, a substituted or unsubstituted C6-C60 (e.g. C6-C32) arylthio group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group.

[0114] For example, in Formula 202, R201 and R202 may optionally be linked to each other via a single bond, a dimethyl-methylene group, or a diphenyl-methylene group, and R203 and R204 may optionally be linked to each other via a single bond, a dimethyl-methylene group, or a diphenyl-methylene group.

[0115] In one embodiment, in Formulae 201 and 202,
L201 to L205 may each independently be selected from:
a phenylene group, a pentalenylene group, an indenylene group, a naphthylene group, an azulenylene group, a heptalenylene group, an indacenylene group, an acenaphthylene group, a fluorenylene group, a spiro-bifluorenylene group, a benzofluorenylene group, a dibenzofluorenylene group, a phenalenylene group, a phenanthrenylene group, an anthracenylene group, a fluoranthenylene group, a triphenylenylene group, a pyrenylene group, a chrysenylene group, a naphthacenylene group, a picenylene group, a perylenylene group, a pentaphenylene group, a hexacenylene group, a pentacenylene group, a rubicenylene group, a coronenylene group, an ovalenylene group, a thiophenylene group, a furanylene group, a carbazolylene group, an indolylene group, an isoindolylene group, a benzofuranylene group, a benzothiophenylene group, a dibenzofuranylene group, a dibenzothiophenylene group, a benzocarbazolylene group, a dibenzocarbazolylene group, a dibenzosilolylene group, and a pyridinylene group; and
a phenylene group, a pentalenylene group, an indenylene group, a naphthylene group, an azulenylene group, a heptalenylene group, an indacenylene group, an acenaphthylene group, a fluorenylene group, a spiro-bifluorenylene group, a benzofluorenylene group, a dibenzofluorenylene group, a phenalenylene group, a phenanthrenylene group, an anthracenylene group, a fluoranthenylene group, a triphenylenylene group, a pyrenylene group, a chrysenylene group, a naphthacenylene group, a picenylene group, a perylenylene group, a pentaphenylene group, a hexacenylene group, a pentacenylene group, a rubicenylene group, a coronenylene group, an ovalenylene group, a thiophenylene group, a furanylene group, a carbazolylene group, an indolylene group, an isoindolylene group, a benzofuranylene group, a benzothiophenylene group, a dibenzofuranylene group, a dibenzothiophenylene group, a benzocarbazolylene group, a dibenzocarbazolylene group, a dibenzosilolylene group, and a pyridinylene group, each substituted with at least one selected from deuterium, -F, -CI, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C20 alkyl group, a C1-C20 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a phenyl group substituted with a C1-C10 alkyl group, a phenyl group substituted with -F, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl group, -Si(Q31)(Q32)(Q33), and -N(Q31)(Q32), and
Q31 to Q33 may each independently be selected from a C1-C10 alkyl group, a C1-C10 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, and a naphthyl group.

[0116] In one or more embodiments, xa1 to xa4 may each independently be 0, 1, or 2.

[0117] In one or more embodiments, xa5 may be 1, 2, 3, or 4.

[0118] In one or more embodiments, R201 to R204 and Q201 may each independently be selected from: a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl group; and
a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C20 alkyl group, a C1-C20 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a phenyl group substituted with a C1-C10 alkyl group, a phenyl group substituted with -F, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl group, -Si(Q31)(Q32)(Q33), and -N(Q31)(Q32), and
Q31 to Q33 may each be the same as described above.

[0119] In one or more embodiments, at least one selected from R201 to R203 in Formula 201 may each independently be selected from:

a fluorenyl group, a spiro-bifluorenyl group, a carbazolyl group, a dibenzofuranyl group, and a dibenzothiophenyl group; and

a fluorenyl group, a spiro-bifluorenyl group, a carbazolyl group, a dibenzofuranyl group, and a dibenzothiophenyl group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C20 alkyl group, a C1-C20 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a phenyl group substituted with a C1-C10 alkyl group, a phenyl group substituted with -F, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a carbazolyl group, a dibenzofuranyl group, and a dibenzothiophenyl group,

but embodiments of the present disclosure are not limited thereto.



[0120] In one or more embodiments, in Formula 202, i) R201 and R202 may be linked to each other via a single bond, and/or ii) R203 and R204 may be linked to each other via a single bond.

[0121] In one or more embodiments, at least one of R201 to R204 in Formula 202 may be selected from:

a carbazolyl group; and

a carbazolyl group substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C20 alkyl group, a C1-C20 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a phenyl group substituted with a C1-C10 alkyl group, a phenyl group substituted with -F, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a carbazolyl group, a dibenzofuranyl group, and a dibenzothiophenyl group,

but embodiments of the present disclosure are not limited thereto.



[0122] The compound represented by Formula 201 may be represented by Formula 201-1 below:



[0123] In one embodiment, the compound represented by Formula 201 may be represented by Formula 201-2 below, but embodiments of the present disclosure are not limited thereto:





[0124] In one or more embodiments, the compound represented by Formula 201 may be represented by Formula 201-2(1) below, but embodiments of the present disclosure are not limited thereto:



[0125] In one or more embodiments, the compound represented by Formula 201 may be represented by Formula 201A below:





[0126] In one or more embodiments, the compound represented by Formula 201 may be represented by Formula 201A(1) below, but embodiments of the present disclosure are not limited thereto:



[0127] In one or more embodiments, the compound represented by Formula 201 may be represented by Formula 201A-1 below, but embodiments of the present disclosure are not limited thereto:





[0128] In one embodiment, the compound represented by Formula 202 may be represented by Formula 202-1 below:



[0129] In one or more embodiments, the compound represented by Formula 202 may be represented by Formula 202-1 (1) below:



[0130] In one or more embodiments, the compound represented by Formula 202 may be represented by Formula 202A below:



[0131] In one or more embodiments, the compound represented by Formula 202 may be represented by Formula 202A-1 below:



[0132] In Formulae 201-1, 201-2, 201-2(1), 201A, 201A(1), 201A-1, 202-1, 202-1(1), 202A, and 202A-1,
L201 to L203, xa1 to xa3, xa5, and R202 to R204 may each be the same as described above,
L205 may be selected from a phenylene group and a fluorenylene group,
X211 may be selected from O, S, and N(R211),
X212 may be selected from O, S, and N(R212),
R211 and R212 may each be the same as described in connection with R203, and
R213 to R217 may each independently be selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C20 alkyl group, a C1-C20 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a phenyl group substituted with a C1-C10 alkyl group, a phenyl group substituted with -F, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl group.

[0133] The hole transport region may include at least one compound selected from Compounds HT1 to HT48 below, but embodiments of the present disclosure are not limited thereto:

































[0134] A thickness of the hole transport region may be in a range of about 100 Å to about 10,000 Å, for example, about 100 Å to about 7,000 Å, about 100 Å to about 5,000 Å, or about 100 Å to about 1,000 Å. When the hole transport region includes at least one selected from a hole injection layer and a hole transport layer, the thickness of the hole injection layer may be in a range of about 100 Å to about 9,000 Å, for example, about 100 Å to about 7,000 Å, about 100 Å to about 5,000 Å, about 100 Å to about 3,000 Å, about 100 Å to about 2,000 Å, about 100 Å to about 1,000 Å or about 500 Å to about 700 Å, and the thickness of the hole transport layer may be in a range of about 50 Å to about 2,000 Å, for example, about 100 Å to about 1,500 Å or about 200 Å to about 400 Å. When the thicknesses of the hole transport region, the hole injection layer and the hole transport layer are within these ranges, suitable or satisfactory hole transporting characteristics may be obtained without a substantial increase in driving voltage.

[0135] The emission auxiliary layer may increase light-emission efficiency by compensating for an optical resonance distance according to the wavelength of light emitted by an emission layer, and the electron blocking layer may block or reduce the flow of electrons from an electron transport region. The emission auxiliary layer and the electron blocking layer may include the materials as described above.

P-dopant



[0136] The hole transport region may further include, in addition to these materials, a charge-generation material for the improvement of conductive properties. The charge-generation material may be homogeneously or non-homogeneously dispersed in the hole transport region.

[0137] The charge-generation material may be, for example, a p-dopant.

[0138] In one embodiment, a lowest unoccupied molecular orbital (LUMO) energy level of the p-dopant may be -3.5 eV or less.

[0139] The p-dopant may include at least one selected from a quinone derivative, a metal oxide, and a cyano group-containing compound, but embodiments of the present disclosure are not limited thereto.

[0140] In one embodiment, the p-dopant may include at least one selected from:

a quinone derivative, such as tetracyanoquinodimethane (TCNQ) and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ);

a metal oxide, such as tungsten oxide or molybdenum oxide;

1,4,5,8,9,12-hexaazatriphenylene-hexacarbonitrile (HAT-CN); and

a compound represented by Formula 221 below,

but embodiments of the present disclosure are not limited thereto:





[0141] In Formula 221,
R221 to R223 may each independently be selected from a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 (e.g. C6-C32) aryl group, a substituted or unsubstituted C1-C60 (e.g. C1-C20) heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, and at least one selected from R221 to R223 may have at least one substituent selected from a cyano group, -F, -CI, -Br, -I, a C1-C20 alkyl group substituted with -F, a C1-C20 alkyl group substituted with -CI, a C1-C20 alkyl group substituted with -Br, and a C1-C20 alkyl group substituted with -I.

Emission layer in organic layer 150



[0142] When the organic light-emitting device 10 is a full-color organic light-emitting device, the emission layer may be patterned into a red emission layer, a green emission layer, or a blue emission layer, according to a sub-pixel. Here, the blue emission layer may include the organometallic compound.

[0143] In one or more embodiments, the emission layer may have a stacked structure of two or more layers selected from a red emission layer, a green emission layer, and a blue emission layer, in which the two or more layers contact (e.g., physically contact) each other or are separated from each other. In one or more embodiments, the emission layer may include two or more materials selected from a red light-emitting material, a green light-emitting material, and a blue light-emitting material, in which the two or more materials are mixed with each other in a single layer to emit white light. Here, the blue light-emitting material may include the organometallic compound.

[0144] In addition, the organic light-emitting device 10 may include the organic layer 150 including the emission layers in the number of p. Here, p may be an integer of 2 or more, and the emission layers in the number of p may have a structure in which the emission layers are in contact (e.g., physical contact) with each other or are spaced apart from each other. Each of two or more emission layers in the number of p may include the organometallic compound.

[0145] In addition, the emission layer may include a first emission layer, a second emission layer, and a third emission layer, wherein the first emission layer may emit first-color light, the second emission layer may emit second-color light, and the third emission layer may emit third-color light. The first-color light, the second-color light, and the third-color light may each have a different maximum emission wavelength from each other. The first-color light may be blue, the second-color light may be green, the third-color light may be red, and the first emission layer may include the organometallic compound represented by Formula 1.

[0146] The emission layer may include a host and a dopant. The dopant may include the organometallic compound represented by Formula 1. The host may include at least one of the second compound and the third compound. The second compound and the third compound may each be the same as described elsewhere in the present specification.

[0147] An amount of a dopant in the emission layer may be, based on about 100 parts by weight of the host, in the range of about 0.01 parts by weight to about 15 parts by weight, but embodiments of the present disclosure are not limited thereto.

[0148] A thickness of the emission layer may be in a range of about 100 Å to about 1,000 Å, for example, about 100 Å to about 800 Å, about 150 Å to about 800 Å, about 150 Å to about 700 Å, about 150 Å to about 650 Å, about 200 Å to about 600 Å or about 200 Å to about 400 Å. When the thickness of the emission layer is within this range, excellent light-emission characteristics may be obtained without a substantial increase in driving voltage.

Electron transport region in organic layer 150



[0149] The electron transport region may have i) a single-layered structure including a single layer including a single material, ii) a single-layered structure including a single layer including a plurality of different materials, or iii) a multi-layered structure having a plurality of layers including a plurality of different materials.

[0150] The electron transport region may include at least one selected from a buffer layer, a hole blocking layer, an electron control layer, an electron transport layer, and an electron injection layer, but embodiments of the present disclosure are not limited thereto.

[0151] For example, the electron transport region may have an electron transport layer/electron injection layer structure, a hole blocking layer/electron transport layer/electron injection layer structure, an electron control layer/electron transport layer/electron injection layer structure, or a buffer layer/electron transport layer/electron injection layer structure, wherein for each structure, constituting layers are sequentially stacked from an emission layer. However, embodiments of the structure of the electron transport region are not limited thereto.

[0152] The electron transport region may include the second compound as described above.

[0153] In one embodiment, the electron transport region may include a buffer layer, the buffer layer is in direct contact (e.g., physical contact) with the emission layer, and the buffer layer may include the second compound as described above.

[0154] In one or more embodiments, the electron transport region may include a buffer layer, an electron transport layer, and an electron injection layer stacked in this order from the emission layer, and the buffer layer may include the second compound as described above.

[0155] The electron transport region (for example, a hole blocking layer, an electron control layer, or an electron transport layer in the electron transport region) may include a metal-free compound containing at least one π electron-depleted nitrogen-containing ring.

[0156] The term "π electron-depleted nitrogen-containing ring," as used herein, indicates a C1-C60 (e.g. a C1-C30) heterocyclic group having at least one *-N=*' moiety as a ring-forming moiety.

[0157] For example, the "π electron-depleted nitrogen-containing ring" may be i) a 5-membered to 7-membered heteromonocyclic group having at least one *-N=*' moiety, ii) a heteropolycyclic group in which two or more 5-membered to 7-membered heteromonocyclic groups each having at least one *-N=*' moiety are condensed with each other (e.g., combined together), or iii) a heteropolycyclic group in which at least one of 5-membered to 7-membered heteromonocyclic groups, each having at least one *-N=*' moiety, is condensed with (e.g., combined with) at least one C5-C60 (e.g. a C5-C30) carbocyclic group.

[0158] Examples of the π electron-deficient nitrogen-containing ring include an imidazole ring, a pyrazole ring, a thiazole ring, an isothiazole ring, an oxazole ring, an isoxazole ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, a pyridazine ring, an indazole ring, a purine ring, a quinoline ring, an isoquinoline ring, a benzoquinoline ring, a phthalazine ring, a naphthyridine ring, a quinoxaline ring, a quinazoline ring, a cinnoline ring, a phenanthridine ring, an acridine ring, a phenanthroline ring, a phenazine ring, a benzimidazole ring, an benzoisothiazole ring, a benzoxazole ring, an benzoisooxazole ring, a triazole ring, a tetrazole ring, an oxadiazole ring, a triazine ring, a thiadiazole ring, an imidazopyridine ring, an imidazopyrimidine ring, and an azacarbazole ring, but are not limited thereto.

[0159] For example, the electron transport region may include a compound represented by Formula 601 below:

         Formula 601     [Ar601]xe11-[(L601)xe1-R601]xe21.



[0160] In Formula 601,
Ar601 may be a substituted or unsubstituted C5-C60 carbocyclic group or a substituted or unsubstituted C1-C60 heterocyclic group,
xe11 may be 1, 2, or 3,
L601 may be selected from a substituted or unsubstituted C3-C10 cycloalkylene group, a substituted or unsubstituted C1-C10 heterocycloalkylene group, a substituted or unsubstituted C3-C10 cycloalkenylene group, a substituted or unsubstituted C1-C10 heterocycloalkenylene group, a substituted or unsubstituted C6-C60 arylene group, a substituted or unsubstituted C1-C60 heteroarylene group, a substituted or unsubstituted divalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted divalent non-aromatic condensed heteropolycyclic group,
xe1 may be an integer from 0 to 5,
R601 may be selected from a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, a substituted or unsubstituted C1-C60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, - Si(Q601)(Q602)(Q603), -C(=O)(Q601), -S(=O)2(Q601), and -P(=O)(Q601)(Q602),
Q601 to Q603 may each independently be a C1-C10 alkyl group, a C1-C10 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, or a naphthyl group, and
xe21 may be an integer from 1 to 5.

[0161] In one embodiment, at least one of Ar601(s) in the number of xe11 and R601(s) in the number of xe21 may include the π electron-deficient nitrogen-containing ring.

[0162] For example, Ar601 may be a substituted or unsubstituted C5-C30 carbocyclic group or a substituted or unsubstituted C1-C20 heterocyclic group, but embodiments are not limited thereto.

[0163] In one embodiment, Ar601 in Formula 601 may be selected from:

a benzene group, a naphthalene group, a fluorene group, a spiro-bifluorene group, a benzofluorene group, a dibenzofluorene group, a phenalene group, a phenanthrene group, an anthracene group, a fluoranthene group, a triphenylene group, a pyrene group, a chrysene group, a naphthacene group, a picene group, a perylene group, a pentaphene group, an indenoanthracene group, a dibenzofuran group, a dibenzothiophene group, a carbazole group, an imidazole group, a pyrazole group, a thiazole group, an isothiazole group, an oxazole group, an isoxazole group, a pyridine group, a pyrazine group, a pyrimidine group, a pyridazine group, an indazole group, a purine group, a quinoline group, an isoquinoline group, a benzoquinoline group, a phthalazine group, a naphthyridine group, a quinoxaline group, a quinazoline group, a cinnoline group, a phenanthridine group, an acridine group, a phenanthroline group, a phenazine group, a benzimidazole group, an isobenzothiazole group, a benzoxazole group, an isobenzoxazole group, a triazole group, a tetrazole group, an oxadiazole group, a triazine group, a thiadiazole group, an imidazopyridine group, an imidazopyrimidine group, and an azacarbazole group; and

a benzene group, a naphthalene group, a fluorene group, a spiro-bifluorene group, a benzofluorene group, a dibenzofluorene group, a phenalene group, a phenanthrene group, an anthracene group, a fluoranthene group, a triphenylene group, a pyrene group, a chrysene group, a naphthacene group, a picene group, a perylene group, a pentaphene group, an indenoanthracene group, a dibenzofuran group, a dibenzothiophene group, a carbazole group, an imidazole group, a pyrazole group, a thiazole group, an isothiazole group, an oxazole group, an isoxazole group, a pyridine group, a pyrazine group, a pyrimidine group, a pyridazine group, an indazole group, a purine group, a quinoline group, an isoquinoline group, a benzoquinoline group, a phthalazine group, a naphthyridine group, a quinoxaline group, a quinazoline group, a cinnoline group, a phenanthridine group, an acridine group, a phenanthroline group, a phenazine group, a benzimidazole group, an isobenzothiazole group, a benzoxazole group, an isobenzoxazole group, a triazole group, a tetrazole group, an oxadiazole group, a triazine group, a thiadiazole group, an imidazopyridine group, an imidazopyrimidine group, and an azacarbazole group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, -Si(Q31)(Q32)(Q33), -S(=O)2(Q31), and -P(=O)(Q31)(Q32), and

Q31 to Q33 may each independently be selected from a C1-C10 alkyl group, a C1-C10 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, and a naphthyl group.



[0164] When xe11 in Formula 601 is 2 or more, two or more Ar601(s) may be linked to each other via a single bond.

[0165] In one or more embodiments, Ar601 in Formula 601 may be an anthracene group.

[0166] In one or more embodiments, the compound represented by Formula 601 may be represented by Formula 601-1 below:



[0167] In Formula 601-1,
X614 may be N or C(R614), X615 may be N or C(R615), X616 may be N or C(R616), and at least one of X614 to X616 may be N,
L611 to L613 may each independently be the same as described in connection with L601,
xe611 to xe613 may each independently be the same as described in connection with xe1,
R611 to R613 may each independently be the same as described in connection with R601, and
R614 to R616 may each independently be selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, and a naphthyl group.

[0168] For example, L601 and L611 to L613 in Formulae 601 and 601-1 may each independently be selected from: a substituted or unsubstituted C3-C10 cycloalkylene group, a substituted or unsubstituted C1-C10 heterocycloalkylene group, a substituted or unsubstituted C3-C10 cycloalkenylene group, a substituted or unsubstituted C1-C10 heterocycloalkenylene group, a substituted or unsubstituted C6-C30 arylene group, a substituted or unsubstituted C1-C20 heteroarylene group, a substituted or unsubstituted divalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted divalent non-aromatic condensed heteropolycyclic group, but embodiments are not limited thereto.

[0169] In one embodiment, L601 and L611 to L613 in Formulae 601 and 601-1 may each independently be selected from:

a phenylene group, a naphthylene group, a fluorenylene group, a spiro-bifluorenylene group, a benzofluorenylene group, a dibenzofluorenylene group, a phenanthrenylene group, an anthracenylene group, a fluoranthenylene group, a triphenylenylene group, a pyrenylene group, a chrysenylene group, a perylenylene group, a pentaphenylene group, a hexacenylene group, a pentacenylene group, a thiophenylene group, a furanylene group, a carbazolylene group, an indolylene group, an isoindolylene group, a benzofuranylene group, a benzothiophenylene group, a dibenzofuranylene group, a dibenzothiophenylene group, a benzocarbazolylene group, a dibenzocarbazolylene group, a dibenzosilolylene group, a pyridinylene group, an imidazolylene group, a pyrazolylene group, a thiazolylene group, an isothiazolylene group, an oxazolylene group, an isoxazolylene group, a thiadiazolylene group, an oxadiazolylene group, a pyrazinylene group, a pyrimidinylene group, a pyridazinylene group, a triazinylene group, a quinolinylene group, an isoquinolinylene group, a benzoquinolinylene group, a phthalazinylene group, a naphthyridinylene group, a quinoxalinylene group, a quinazolinylene group, a cinnolinylene group, a phenanthridinylene group, an acridinylene group, a phenanthrolinylene group, a phenazinylene group, a benzimidazolylene group, an isobenzothiazolylene group, a benzoxazolylene group, an isobenzoxazolylene group, a triazolylene group, a tetrazolylene group, an imidazopyridinylene group, an imidazopyrimidinylene group, and an azacarbazolylene group; and

a phenylene group, a naphthylene group, a fluorenylene group, a spiro-bifluorenylene group, a benzofluorenylene group, a dibenzofluorenylene group, a phenanthrenylene group, an anthracenylene group, a fluoranthenylene group, a triphenylenylene group, a pyrenylene group, a chrysenylene group, a perylenylene group, a pentaphenylene group, a hexacenylene group, a pentacenylene group, a thiophenylene group, a furanylene group, a carbazolylene group, an indolylene group, an isoindolylene group, a benzofuranylene group, a benzothiophenylene group, a dibenzofuranylene group, a dibenzothiophenylene group, a benzocarbazolylene group, a dibenzocarbazolylene group, a dibenzosilolylene group, a pyridinylene group, an imidazolylene group, a pyrazolylene group, a thiazolylene group, an isothiazolylene group, an oxazolylene group, an isoxazolylene group, a thiadiazolylene group, an oxadiazolylene group, a pyrazinylene group, a pyrimidinylene group, a pyridazinylene group, a triazinylene group, a quinolinylene group, an isoquinolinylene group, a benzoquinolinylene group, a phthalazinylene group, a naphthyridinylene group, a quinoxalinylene group, a quinazolinylene group, a cinnolinylene group, a phenanthridinylene group, an acridinylene group, a phenanthrolinylene group, a phenazinylene group, a benzimidazolylene group, an isobenzothiazolylene group, a benzoxazolylene group, an isobenzoxazolylene group, a triazolylene group, a tetrazolylene group, an imidazopyridinylene group, an imidazopyrimidinylene group, and an azacarbazolylene group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, and an azacarbazolyl group,

but embodiments of the present disclosure are not limited thereto.



[0170] In one or more embodiments, xe1 and xe611 to xe613 in Formulae 601 and 601-1 may each independently be 0, 1, or 2.

[0171] For example, R601 and R611 to R613 in Formulae 601 and 601-1 may each independently be selected from: a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C6-C30 aryloxy group, a substituted or unsubstituted C6-C30 arylthio group, a substituted or unsubstituted C1-C20 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, - Si(Q601)(Q602)(Q603), -C(=O)(Q601), -S(=O)2(Q601), and -P(=O)(Q601)(Q602).

[0172] In one or more embodiments, R601 and R611 to R613 in Formulae 601 and 601-1 may each independently be selected from:

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, and an azacarbazolyl group;

a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, and an azacarbazolyl group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C20 alkyl group, a C1-C20 alkoxy group, a phenyl group, a biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a thiophenyl group, a furanyl group, a carbazolyl group, an indolyl group, an isoindolyl group, a benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, and an azacarbazolyl group; and

-S(=O)2(Q601) and -P(=O)(Q601)(Q602), and

Q601 and Q602 may each be the same as described above.



[0173] The electron transport region may include at least one compound selected from Compounds ET1 to ET36 below, but embodiments of the present disclosure are not limited thereto:

























[0174] In one or more embodiments, the electron transport region may include at least one selected from 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), Alq3, BAlq, 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole (TAZ), and NTAZ:



[0175] Thicknesses of the buffer layer, the hole blocking layer, and the electron control layer may each independently be in a range of about 20 Å to about 1,000 Å, for example, about 20 Å to about 700 Å, about 20 Å to about 500 Å, about 20 Å to about 400 Å, about 30 Å to about 400 Å or about 30 Å to about 300 Å. When the thicknesses of the buffer layer, the hole blocking layer, and the electron control layer are within these ranges, excellent hole blocking characteristics or excellent electron control characteristics may be obtained without a substantial increase in driving voltage.

[0176] A thickness of the electron transport layer may be in a range of about 100 Å to about 1,000 Å, for example, about 100 Å to about 700 Å, about 100 Å to about 600 Å, about 150 Å to about 600 Å, about 150 Å to about 500 Å or about 200 Å to about 400 Å. When the thickness of the electron transport layer is within the range described above, the electron transport layer may have suitable or satisfactory electron transport characteristics without a substantial increase in driving voltage.

[0177] The electron transport region (for example, the electron transport layer in the electron transport region) may further include, in addition to the materials described above, a metal-containing material.

[0178] The metal-containing material may include at least one selected from alkali metal complex and alkaline earth-metal complex. The alkali metal complex may include a metal ion selected from a Li ion, a Na ion, a K ion, a Rb ion, and a Cs ion, and the alkaline earth-metal complex may include a metal ion selected from a Be ion, a Mg ion, a Ca ion, a Sr ion, and a Ba ion. A ligand coordinated with the metal ion of the alkali metal complex or the alkaline earth-metal complex may be selected from a hydroxy quinoline, a hydroxy isoquinoline, a hydroxy benzoquinoline, a hydroxy acridine, a hydroxy phenanthridine, a hydroxy phenyloxazole, a hydroxy phenylthiazole, a hydroxy diphenyloxadiazole, a hydroxy diphenylthiadiazole, a hydroxy phenylpyridine, a hydroxy phenylbenzimidazole, a hydroxy phenylbenzothiazole, a bipyridine, a phenanthroline, and a cyclopentadiene, but embodiments of the present disclosure are not limited thereto.

[0179] For example, the metal-containing material may include a Li complex. The Li complex may include, for example, Compound ET-D1 (lithium quinolate, LiQ) or ET-D2:



[0180] The electron transport region may include an electron injection layer that facilitates electron injection from the second electrode 190. The electron injection layer may directly contact (e.g., physically contact) the second electrode 190.

[0181] The electron injection layer may have i) a single-layered structure including a single layer including a single material, ii) a single-layered structure including a single layer including a plurality of different materials, or iii) a multi-layered structure having a plurality of layers including a plurality of different materials.

[0182] The electron injection layer may include an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth-metal compound, a rare earth metal compound, an alkali metal complex, an alkaline earth-metal complex, a rare earth metal complex, or any combinations thereof.

[0183] In one embodiment, the electron injection layer may include Li, Na, K, Rb, Cs, Mg, Ca, Er, Tm, Yb, or any combination thereof, but embodiments of the present disclosure are not limited thereto.

[0184] The alkali metal may be selected from Li, Na, K, Rb, and Cs. In one embodiment, the alkali metal may be Li, Na, or Cs. In one or more embodiments, the alkali metal may be Li or Cs, but embodiments of the present disclosure are not limited thereto.

[0185] The alkaline earth metal may be selected from Mg, Ca, Sr, and Ba.

[0186] The rare earth metal may be selected from Sc, Y, Ce, Tm, Yb, Gd, and Tb.

[0187] The alkali metal compound, the alkaline earth-metal compound, and the rare earth metal compound may be selected from oxides and halides (for example, fluorides, chlorides, bromides, or iodides) of the alkali metal, the alkaline earth-metal, and the rare earth metal.

[0188] The alkali metal compound may be selected from alkali metal oxides, such as Li2O, Cs2O, or K2O, and alkali metal halides, such as LiF, NaF, CsF, KF, LiI, NaI, CsI, or KI. In one embodiment, the alkali metal compound may be selected from LiF, Li2O, NaF, LiI, NaI, CsI, and KI, but embodiments of the present disclosure are not limited thereto.

[0189] The alkaline earth-metal compound may be selected from alkaline earth-metal oxides, such as BaO, SrO, CaO, BaxSr1-xO (0<x<1), or BaxCa1-xO (0<x<1). In one embodiment, the alkaline earth-metal compound may be selected from BaO, SrO, and CaO, but embodiments of the present disclosure are not limited thereto.

[0190] The rare earth metal compound may be selected from YbF3, ScF3, SCO3, Sc2O3, Y2O3, Ce2O3, GdF3, and TbF3. In one embodiment, the rare earth metal compound may be selected from YbF3, ScF3, TbF3, YbI3, ScI3, and TbI3, but embodiments of the present disclosure are not limited thereto.

[0191] The alkali metal complex, the alkaline earth-metal complex, and the rare earth metal complex may include an ion of alkali metal, alkaline earth-metal, and rare earth metal as described above, and a ligand coordinated with a metal ion of the alkali metal complex, the alkaline earth-metal complex, or the rare earth metal complex may be selected from hydroxy quinoline, hydroxy isoquinoline, hydroxy benzoquinoline, hydroxy acridine, hydroxy phenanthridine, hydroxy phenyloxazole, hydroxy phenylthiazole, hydroxy phenyloxadiazole, hydroxy phenylthiadiazole, hydroxy phenylpyridine, hydroxy phenylbenzimidazole, hydroxy phenylbenzothiazole, bipyridine, phenanthroline, and cyclopentadiene, but embodiments of the present disclosure are not limited thereto.

[0192] The electron injection layer may include (or consist of) an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth-metal compound, a rare earth metal compound, an alkali metal complex, an alkaline earth-metal complex, a rare earth metal complex, or any combinations thereof, as described above. In one or more embodiments, the electron injection layer may further include an organic material. When the electron injection layer further includes an organic material, an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth-metal compound, a rare earth metal compound, an alkali metal complex, an alkaline earth-metal complex, a rare earth metal complex, or any combination thereof may be homogeneously or non-homogeneously dispersed in a matrix including the organic material.

[0193] A thickness of the electron injection layer may be in a range of about 1 Å to about 100 Å, for example, about 3 Å to about 90 Å or about 3 Å to about 20 Å. When the thickness of the electron injection layer is within the range described above, the electron injection layer may have suitable or satisfactory electron injection characteristics without a substantial increase in driving voltage.

[0194] In one embodiment, the electron transport region in the organic light-emitting device 10 may include a buffer layer, an electron transport layer, and an electron injection layer, and
at least one layer selected from the electron transport layer and the electron injection layer may include an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth metal compound, a rare earth metal compound, an alkali metal complex, an alkaline earth metal complex, a rare earth metal complex, or any combination thereof.

Second electrode 190



[0195] The second electrode 190 is located on the organic layer 150 having such a structure. The second electrode 190 may be a cathode, which is an electron injection electrode, and as a material for forming the second electrode 190, a metal, an alloy, an electrically conductive compound, and any combination thereof, each having a low work function, may be used.

[0196] The second electrode 190 may include at least one selected from lithium (Li), silver (Ag), magnesium (Mg), aluminium (Al), aluminium-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag), ITO, and IZO, but embodiments of the present disclosure are not limited thereto. The second electrode 190 may be a transmissive electrode, a semi-transmissive electrode, or a reflective electrode.

[0197] The second electrode 190 may have a single-layered structure or a multi-layered structure including two or more layers.

Description of FIGS. 2 to 4



[0198] An organic light-emitting device 20 of FIG. 2 includes a first capping layer 210, a first electrode 110, an organic layer 150, and a second electrode 190 which are sequentially stacked in this stated order. An organic light-emitting device 30 of FIG. 3 includes a first electrode 110, an organic layer 150, a second electrode 190, and a second capping layer 220 which are sequentially stacked in this stated order. An organic light-emitting device 40 of FIG. 4 includes a first capping layer 210, a first electrode 110, an organic layer 150, a second electrode 190, and a second capping layer 220.

[0199] Regarding FIGS. 2 to 4, the first electrode 110, the organic layer 150, and the second electrode 190 may be understood by referring to the description presented in connection with FIG. 1.

[0200] In the organic layer 150 of each of the organic light-emitting devices 20 and 40, light generated in an emission layer may pass through the first electrode 110, which is a semi-transmissive electrode or a transmissive electrode, and the first capping layer 210 toward the outside, and in the organic layer 150 of each of the organic light-emitting devices 30 and 40, light generated in an emission layer may pass through the second electrode 190, which is a semi-transmissive electrode or a transmissive electrode, and the second capping layer 220 toward the outside.

[0201] The first capping layer 210 and the second capping layer 220 may increase external luminescent efficiency according to the principle of constructive interference.

[0202] The first capping layer 210 and the second capping layer 220 may each independently be an organic capping layer including an organic material, an inorganic capping layer including an inorganic material, or a composite capping layer including an organic material and an inorganic material.

[0203] At least one selected from the first capping layer 210 and the second capping layer 220 may each independently include at least one material selected from carbocyclic compounds, heterocyclic compounds, amine-based compounds, porphyrin derivatives, phthalocyanine derivatives, a naphthalocyanine derivatives, alkali metal complexes, and alkaline earth-metal complexes. The carbocyclic compound, the heterocyclic compound, and the amine-based compound may be optionally substituted with a substituent containing at least one element selected from O, N, S, Se, Si, F, Cl, Br, and I. In one embodiment, at least one of the first capping layer 210 and the second capping layer 220 may each independently include an amine-based compound.

[0204] In one embodiment, at least one selected from the first capping layer 210 and the second capping layer 220 may each independently include the compound represented by Formula 201 or the compound represented by Formula 202.

[0205] Hereinbefore, the organic light-emitting device according to an embodiment has been described in connection with FIGS. 1 to 4. However, embodiments of the present disclosure are not limited thereto.

[0206] Layers constituting the hole transport region, an emission layer, and layers constituting the electron transport region may be formed in a set or certain region by using one or more suitable methods selected from vacuum deposition, spin coating, casting, Langmuir-Blodgett (LB) deposition, ink-jet printing, laser-printing, and laser-induced thermal imaging.

[0207] When layers constituting the hole transport region, an emission layer, and layers constituting the electron transport region are formed by vacuum deposition, the deposition may be performed at a deposition temperature of about 100 °C to about 500 °C, a vacuum degree of about 10-8 torr to about 10-3 torr, and a deposition speed of about 0.01 Å/sec to about 100 Å/sec by taking into consideration a compound to be included in a layer to be formed and the structure of a layer to be formed.

[0208] When layers constituting the hole transport region, an emission layer, and layers constituting the electron transport region are formed by spin coating, the spin coating may be performed at a coating speed of about 2,000 rpm to about 5,000 rpm and at a heat treatment temperature of about 80 °C to 200 °C by taking into consideration a compound to be included in a layer to be formed and the structure of a layer to be formed.

General definition of at least some of the substituents



[0209] The term "C1-C60 alkyl group," as used herein, refers to a linear or branched aliphatic saturated hydrocarbon monovalent group having 1 to 60 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, an isoamyl group, and a hexyl group. The term "C1-C60 alkylene group," as used herein, refers to a divalent group having substantially the same structure as the C1-C60 alkyl group. Corresponding definitions apply to other ranges given for the number of carbon atoms in an alkyl/alkylene group.

[0210] The term "C2-C60 alkenyl group," as used herein, refers to a hydrocarbon group having at least one carbon-carbon double bond at a main chain (e.g., in the middle) or at a terminal end (e.g., the terminus) of the C2-C60 alkyl group, and examples thereof include an ethenyl group, a propenyl group, and a butenyl group. The term "C2-C60 alkenylene group," as used herein, refers to a divalent group having substantially the same structure as the C2-C60 alkenyl group. Corresponding definitions apply to other ranges given for the number of carbon atoms in an alkenyl/alkenylene group.

[0211] The term "C2-C60 alkynyl group," as used herein, refers to a hydrocarbon group having at least one carbon-carbon triple bond at a main chain (e.g., in the middle) or at a terminal end (e.g., the terminus) of the C2-C60 alkyl group, and examples thereof include an ethynyl group, and a propynyl group. The term "C2-C60 alkynylene group," as used herein, refers to a divalent group having substantially the same structure as the C2-C60 alkynyl group. Corresponding definitions apply to other ranges given for the number of carbon atoms in an alkynyl/alkynylene group.

[0212] The term "C1-C60 alkoxy group," as used herein, refers to a monovalent group represented by -OA101 (wherein A101 is the C1-C60 alkyl group), and examples thereof include a methoxy group, an ethoxy group, and an isopropyloxy group. Corresponding definitions apply to other ranges given for the number of carbon atoms in an alkoxy group.

[0213] The term "C3-C10 cycloalkyl group," as used herein, refers to a monovalent saturated hydrocarbon monocyclic group having 3 to 10 carbon atoms, and examples thereof include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group. The term "C3-C10 cycloalkylene group," as used herein, refers to a divalent group having substantially the same structure as the C3-C10 cycloalkyl group.

[0214] The term "C1-C10 heterocycloalkyl group," as used herein, refers to a monovalent monocyclic group having at least one heteroatom selected from N, O, Si, P, and S as a ring-forming atom and 1 to 10 carbon atoms, and examples thereof include a 1,2,3,4-oxatriazolidinyl group, a tetrahydrofuranyl group, and a tetrahydrothiophenyl group. The term "C1-C10 heterocycloalkylene group," as used herein, refers to a divalent group having substantially the same structure as the C1-C10 heterocycloalkyl group.

[0215] The term "C3-C10 cycloalkenyl group," as used herein refers to a monovalent monocyclic group that has 3 to 10 carbon atoms and at least one carbon-carbon double bond in the ring thereof and no aromaticity (e.g., is not aromatic), and examples thereof include a cyclopentenyl group, a cyclohexenyl group, and a cycloheptenyl group. The term "C3-C10 cycloalkenylene group," as used herein, refers to a divalent group having substantially the same structure as the C3-C10 cycloalkenyl group.

[0216] The term "C1-C10 heterocycloalkenyl group," as used herein, refers to a monovalent monocyclic group that has at least one heteroatom selected from N, O, Si, P, and S as a ring-forming atom, 1 to 10 carbon atoms, and at least one carbon-carbon double bond in its ring. Examples of the C1-C10 heterocycloalkenyl group include a 4,5-dihydro-1,2,3,4-oxatriazolyl group, a 2,3-hydrofuranyl group, and a 2,3-hydrothiophenyl group. The term "C1-C10 heterocycloalkenylene group," as used herein, refers to a divalent group having substantially the same structure as the C1-C10 heterocycloalkenyl group.

[0217] The term "C6-C60 aryl group," as used herein, refers to a monovalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms, and the term "C6-C60 arylene group," as used herein, refers to a divalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms. Examples of the C6-C60 aryl group include a fluorenyl group, a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a pyrenyl group, and a chrysenyl group. When the C6-C60 aryl group and the C6-C60 arylene group each include two or more rings, the two or more rings may be fused to each other (e.g., combined together). The C7-C60 alkylaryl group used herein refers to a C6-C60 aryl group substituted with at least one C1-C60 alkyl group. Corresponding definitions apply to other ranges given for the number of carbon atoms in an aryl/arylene group.

[0218] The term "C1-C60 heteroaryl group," as used herein, refers to a monovalent group having a carbocyclic aromatic system that has at least one heteroatom selected from N, O, Si, P, and S as a ring-forming atom, in addition to 1 to 60 carbon atoms. The term " C1-C60 heteroarylene group," as used herein, refers to a divalent group having a carbocyclic aromatic system that has at least one heteroatom selected from N, O, Si, P, and S as a ring-forming atom, in addition to 1 to 60 carbon atoms. Examples of the C1-C60 heteroaryl group include a carbazolyl group, a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, and an isoquinolinyl group. When the C1-C60 heteroaryl group and the C1-C60 heteroarylene group each include two or more rings, the two or more rings may be condensed with each other (e.g., combined together). The C7-C60 alkylaryl group used herein refers to a C6-C60 aryl group substituted with at least one C1-C60 alkyl group. Corresponding definitions apply to other ranges given for the number of carbon atoms in an heteroaryl/heteroarylene group.

[0219] The term "C6-C60 aryloxy group," as used herein, refers to -OA102 (wherein A102 is the C6-C60 aryl group), and the term "C6-C60 arylthio group," as used herein, refers to -SA103 (wherein A103 is the C6-C60 aryl group). Corresponding definitions apply to other ranges given for the number of carbon atoms in an aryloxy group and an arylthio group.

[0220] The term "monovalent non-aromatic condensed polycyclic group," as used herein, refers to a monovalent group (for example, having 8 to 60 carbon atoms) having two or more rings condensed with each other (e.g., combined together), only carbon atoms as ring-forming atoms, and no aromaticity in its entire molecular structure. An example of the monovalent non-aromatic condensed polycyclic group is a fluorenyl group. The term "divalent non-aromatic condensed polycyclic group," as used herein, refers to a divalent group having substantially the same structure as the monovalent non-aromatic condensed polycyclic group.

[0221] The term "monovalent non-aromatic condensed heteropolycyclic group," as used herein, refers to a monovalent group (for example, having 1 to 60 carbon atoms) having two or more rings condensed to each other (e.g., combined together), at least one heteroatom selected from N, O, Si, P, and S, other than carbon atoms, as a ring-forming atom, and no aromaticity in its entire molecular structure (e.g., is not aromatic). An example of the monovalent non-aromatic condensed heteropolycyclic group is a carbazolyl group. The term "divalent non-aromatic condensed heteropolycyclic group," as used herein, refers to a divalent group having substantially the same structure as the monovalent non-aromatic condensed heteropolycyclic group.

[0222] The term "C5-C60 carbocyclic group," as used herein, refers to a monocyclic or polycyclic group that includes only carbon as a ring-forming atom and includes (or consists of) 5 to 60 carbon atoms. The C5-C60 carbocyclic group may be an aromatic carbocyclic group or a non-aromatic carbocyclic group. The C5-C60 carbocyclic group may be a ring, such as benzene, a monovalent group, such as a phenyl group, or a divalent group, such as a phenylene group. In one or more embodiments, depending on the number of substituents connected to the C5-C60 carbocyclic group, the C5-C60 carbocyclic group may be a trivalent group or a quadrivalent group. Corresponding definitions apply to other ranges given for the number of carbon atoms in a carbocyclic group.

[0223] The term "C1-C60 heterocyclic group," as used herein, refers to a group having substantially the same structure as the C5-C60 carbocyclic group, except that as a ring-forming atom, at least one heteroatom selected from N, O, Si, P, and S is used in addition to carbon (the number of carbon atoms may be in a range of 1 to 60). Corresponding definitions apply to other ranges given for the number of carbon atoms in a heterocyclic group.

[0224] In the present specification, at least one substituent of the substituted C5-C60 (e.g. C5-C30) carbocyclic group, the substituted C1-C60 (e.g. C1-C20) heterocyclic group, the substituted C3-C10 cycloalkylene group, the substituted C1-C10 heterocycloalkylene group, the substituted C3-C10 cycloalkenylene group, the substituted C1-C10 heterocycloalkenylene group, the substituted C6-C60 (e.g. C6-C30) arylene group, the substituted C1-C60 (e.g. C1-C20) heteroarylene group, the substituted divalent non-aromatic condensed polycyclic group, the substituted divalent non-aromatic condensed heteropolycyclic group, the substituted C1-C60 (e.g. C1-C20) alkyl group, the substituted C2-C60 (e.g. C2-C20) alkenyl group, the substituted C2-C60 (e.g. C2-C20) alkynyl group, the substituted C1-C60 (e.g. C1-C20) alkoxy group, the substituted C3-C10 cycloalkyl group, the substituted C1-C10 heterocycloalkyl group, the substituted C3-C10 cycloalkenyl group, the substituted C1-C10 heterocycloalkenyl group, the substituted C6-C60 (e.g. C6-C30) aryl group, the substituted C7-C60 (e.g. C7-C30) alkylaryl group, the substituted C6-C60 (e.g. C6-C30) aryloxy group, the substituted C6-C60 (e.g. C6-C30) arylthio group, the substituted C1-C60 (e.g. C1-C20) heteroaryl group, the substituted C2-C60 (e.g. C2-C20) alkylheteroaryl group, the substituted C1-C60 (e.g. C1-C20) heteroaryloxy group, the substituted C1-C60 (e.g. C1-C20) heteroarylthio group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group may be selected from:

deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 (e.g. C1-C20) alkyl group, a C2-C60 (e.g. C2-C20) alkenyl group, a C2-C60 (e.g. C2-C20) alkynyl group, and a C1-C60 (e.g. C1-C20) alkoxy group;

a C1-C60 (e.g. C1-C20) alkyl group, a C2-C60 (e.g. C2-C20) alkenyl group, a C2-C60 (e.g. C2-C20) alkynyl group, and a C1-C60 (e.g. C1-C20) alkoxy group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 (e.g. C6-C30) aryl group, a C7-C60 (e.g. C7-C30) alkylaryl group, a C6-C60 (e.g. C6-C30) aryloxy group, a C6-C60 (e.g. C6-C30) arylthio group, a C1-C60 (e.g. C1-C20) heteroaryl group, a C2-C60 (e.g. C2-C20) alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, -O(Q11), -S(Q11), - Si(Q11)(Q12)(Q13), -N(Q11)(Q12), -B(Q11)(Q12), -P(Q11)(Q12), -C(=O)(Q11), -S(=O)2(Q11), and -P(=O)(Q11)(Q12);

a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 (e.g. C6-C30) aryl group, a C7-C60 (e.g. C7-C30) alkylaryl group, a C6-C60 (e.g. C6-C30) aryloxy group, a C6-C60 (e.g. C6-C30) arylthio group, a C1-C60 (e.g. C1-C20) heteroaryl group, a C2-C60 (e.g. C2-C20) alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;

a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 (e.g. C6-C30) aryl group, a C7-C60 (e.g. C7-C30) alkylaryl group, a C6-C60 (e.g. C6-C30) aryloxy group, a C6-C60 (e.g. C6-C30) arylthio group, a C1-C60 (e.g. C1-C20) heteroaryl group, a C2-C60 (e.g. C2-C20) alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 (e.g. C1-C20) alkyl group, a C2-C60 (e.g. C2-C20) alkenyl group, a C2-C60 (e.g. C2-C20) alkynyl group, a C1-C60 (e.g. C1-C20) alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 (e.g. C6-C30) aryl group, a C7-C60 (e.g. C7-C30) alkylaryl group, a C6-C60 (e.g. C6-C30) aryloxy group, a C6-C60 (e.g. C6-C30) arylthio group, a C1-C60 (e.g. C1-C20) heteroaryl group, a C2-C60 (e.g. C2-C20) alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, -O(Q21), -S(Q21), -Si(Q21)(Q22)(Q23), -N(Q21)(Q22), -B(Q21)(Q22), -P(Q21)(Q22), -C(=O)(Q21), -S(=O)2(Q21), and -P(=O)(Q21)(Q22); and

-O(Q31), -S(Q31), -Si(Q31)(Q32)(Q33), -N(Q31)(Q32), -B(Q31)(Q32), -P(Q31)(Q32), -C(=O)(Q31), -S(=O)2(Q31), and -P(=O)(Q31)(Q32), and

Q1 to Q3, Q11 to Q13, Q21 to Q23, and Q31 to Q33 may each independently be selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 (e.g. C1-C20) alkyl group, a C2-C60 (e.g. C2-C20) alkenyl group, a C2-C60 (e.g. C2-C20) alkynyl group, a C1-C60 (e.g. C1-C20) alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 (e.g. C6-C30) aryl group, a C6-C60 (e.g. C6-C30) aryloxy group, a C6-C60 (e.g. C6-C30) arylthio group, a C1-C60 (e.g. C1-C20) heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C1-C60 (e.g. C1-C20) alkyl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C60 (e.g. C1-C20) alkyl group, a phenyl group, a terphenyl group, and a biphenyl group, and a C6-C60 (e.g. C6-C30) aryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C10 alkyl group, a phenyl group, and a biphenyl group.



[0225] The term "Ph," as used herein, refers to a phenyl group, the term "Me," as used herein, refers to a methyl group, the term "Et," as used herein, refers to an ethyl group, the term "tert-Bu" or "But," as used herein, refers to a tert-butyl group, and the term "OMe," as used herein, refers to a methoxy group.

[0226] The term "biphenyl group," as used herein, refers to "a phenyl group substituted with a phenyl group." In some embodiments, the "biphenyl group" is a substituted phenyl group having a C6-C60 aryl group as a substituent.

[0227] The term "terphenyl group," as used herein, refers to "a phenyl group substituted with a biphenyl group." In some embodiments, the "terphenyl group" is a substituted phenyl group having, as a substituent, a C6-C60 aryl group substituted with a C6-C60 aryl group.

[0228] * and *' as used herein, unless defined otherwise, each refer to a binding site to a neighboring atom in a corresponding formula.

[0229] Hereinafter, a compound according to embodiments and an organic light-emitting device according to embodiments will be described in more detail with reference to Synthesis Examples and Examples. The wording "B was used instead of A" used in describing Synthesis Examples refers to that an identical molar equivalent of B was used in place of A.

Examples


Synthesis Example 1: Synthesis of Compound BD1



[0230] 


Synthesis of Intermediate Compound [BD1-1]



[0231] 4-(tert-butyl)-2-chloro-6-ethylpyridine (1.0 eq) and sodium (0.03 eq) were stirred for 1 hour, and 4-(tert-butyl)-2-chloro-6-vinylpyridine (1.0 eq) was added to the mixed solution and stirred again at a temperature of 120 °C for 4 hours. After the reaction mixture was cooled to 0 °C, methanol was added thereto to terminate the reaction. Then, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD1-1] (yield: 40 %).

Synthesis of Intermediate Compound [BD1-2]



[0232] Intermediate Compound [BD1-1] (1.0 eq), 2,4-difluorophenylboronic acid (3.0 eq), K2CO3 (2.0 eq), and Pd(PPh3)4 (0.02 eq) were dissolved in toluene (0.1M), and the mixed solution was stirred at a temperature of 120 °C for 12 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD1-2] (yield: 80 %).

Synthesis of Intermediate Compound [BD1-3]



[0233] Intermediate Compound [BD1-2] (1.0 eq), [Ir(COD)OMe]2 (1.1 eq), Ag2O (0.5 eq), and sodium tert-butoxide (3.0 eq) were dissolved in 2-ethoxyethanol (0.5 M), and the mixed solution was stirred at a temperature of 120 °C for 10 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD1-3] (yield: 21 %).

Synthesis of Intermediate Compound [BD1-4]



[0234] Intermediate Compound [BD1-3] (1.0 eq) and silver triflate (1.2 eq) were dissolved in acetone (1.0 M), and the mixed solution was stirred at room temperature for 4 hours. After the reaction mixture was subjected to decompression (reduced pressure) to remove the solvent therefrom, acetonitrile (20 eq) was added thereto and stirred again for 0.5 hours. The solvent was removed therefrom under reduced pressure, and the resulting product was concentrated, so as to synthesize Intermediate Compound [BD1-4] (yield: 81 %).

Synthesis of Intermediate Compound [BD1-5]



[0235] lodobenzene (1.0 eq), benzimidazole (1.2 eq), Cul (0.01 eq), K2CO3 (2.0 eq), and L-proline (0.02 eq) were dissolved in dimethylsulfoxide (0.1 M), and the mixed solution was stirred at a temperature of 160 °C for 48 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD1-5] (yield: 65 %).

Synthesis of Intermediate Compound [BD1-6]



[0236] Intermediate Compound [BD1-5] (1.0 eq) and iodomethane (3.0 eq) were dissolved in THF (1.0 M), and the mixed solution was stirred at a temperature of 70 °C for 12 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD1-6] (yield: 66 %).

Synthesis of Compound BD1



[0237] Intermediate Compound [BD1-4], Intermediate Compound [BD1-6], and K2CO3 (10.0 eq) were dissolved in 2-ethoxyethanol (0.05 M), and the mixed solution was stirred at a temperature of 120 °C for 10 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Compound [BD1] (yield: 61 %).
1H NMR (400 MHz, CDCl3): δ= 7.67 (d, 2H), 7.43(d, 2H), 7.30 (m, 4H), 7.08 (d, 1H), 7.00 (m, 4H), 6.77 (d, 2H), 6.71 (t, 1H), 3.36 (s, 3H), 2.98 (t, 4H), 1.95 (m, 2H), 1,32 (s, 18H)
LC-MS. Calculated for C47H43F4IrN4([M]+):m/z 932.10 Found: m/z 932.31

Synthesis Example 2: Synthesis of Compound BD8



[0238] 


Synthesis of Intermediate Compound [BD8-1]



[0239] 2-chloro-6-ethyl-4-propylpyridine (1.0 eq) and sodium (0.03 eq) were stirred for 1 hour, and 2-chloro-4-propyl-6-vinylpyridine (1.0 eq) was added thereto and stirred again at a temperature of 120 °C for 4 hours. After the reaction mixture was cooled to 0 °C, methanol was added thereto to terminate the reaction. Then, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD8-1] (yield: 40 %).

Synthesis of Intermediate Compound [BD8-2]



[0240] Intermediate Compound [BD8-1] (1.0 eq), 4-fluorophenylboronic acid (3.0 eq), K2CO3 (2.0 eq), and Pd(PPh3)4 (0.02 eq) were dissolved in toluene (0.1 M), and the mixed solution was stirred at a temperature of 120 °C for 12 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD8-2] (yield: 80 %).

Synthesis of Intermediate Compound [BD8-3]



[0241] Intermediate Compound [BD8-2] (1.0 eq), [Ir(COD)OMe]2 (1.1 eq), Ag2O (0.5 eq), and sodium tert-butoxide (3.0 eq) were dissolved in 2-ethoxyethanol (0.5 M), and the mixed solution was stirred at a temperature of 120 °C for 10 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD8-3] (yield: 21 %).

Synthesis of Intermediate Compound [BD8-4]



[0242] Intermediate Compound [BD8-3] (1.0 eq) and silver triflate (1.2 eq) were dissolved in acetone (1.0 M), and the mixed solution was stirred at room temperature for 4 hours. After the reaction mixture was subjected to decompression (reduced pressure) to remove the solvent therefrom, acetonitrile (20 eq) was added thereto and stirred again for 0.5 hours. The solvent was removed therefrom under reduced pressure, and the resulting product was concentrated, so as to synthesize Intermediate Compound [BD8-4] (yield: 81 %).

Synthesis of Intermediate Compound [BD8-5]



[0243] lodobenzene (1.0 eq), benzimidazole (1.2 eq), Cul (0.01 eq), K2CO3 (2.0 eq), and L-proline (0.02 eq) were dissolved in dimethylsulfoxide (0.1 M), and the mixed solution was stirred at a temperature of 160 °C for 48 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD8-5] (yield: 65 %).

Synthesis of Intermediate Compound [BD8-6]



[0244] Intermediate Compound [BD8-5] (1.0 eq) and iodomethane (3.0 eq) were dissolved in THF (1.0 M), and the mixed solution was stirred at a temperature of 70 °C for 12 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD8-6] (yield: 66 %).

Synthesis of Compound BD8



[0245] Intermediate Compound [BD8-4], Intermediate Compound [BD8-6], and K2CO3 (10.0 eq) were dissolved in 2-ethoxyethanol (0.05 M), and the mixed solution was stirred at a temperature of 120 °C for 10 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Compound [BD8] (yield: 61 %).
1H NMR (400 MHz, CDCl3): δ= 7.87 (d, 2H), 7.51(d, 2H), 7.29 (m, 4H), 7.18 (d, 1H), 7.10 (m, 4H), 7.02 (d, 2H), 6.85 (d, 2H), 6.77 (t, 1H), 3.43 (t, 4H), 3.36 (s, 3H), 2.98 (t, 4H), 1.95 (m, 2H), 1.65 (m, 4H), 1.65 (t, 6H)
LC-MS. Calculated for C45H41F2IrN4 ([M]+):m/z 868.06. Found: m/z 868.29

Synthesis Example 3: Synthesis of Compound BD26



[0246] 


Synthesis of Intermediate Compound [BD26-1]



[0247] 2-chloro-6-ethyl-4-propylpyridine (1.0 eq) and sodium (0.03 eq) were stirred for 1 hour, and 2-chloro-4-propyl-6-vinylpyridine (1.0 eq) was added thereto and stirred again at a temperature of 120 °C for 4 hours. After the reaction mixture was cooled to 0 °C, methanol was added thereto to terminate the reaction. Then, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD26-1] (yield: 40 %).

Synthesis of Intermediate Compound [BD26-2]



[0248] Intermediate Compound [BD26-1] (1.0 eq), 4-cyanophenylboronic acid (3.0 eq), K2CO3 (2.0 eq), and Pd(PPh3)4 (0.02 eq) were dissolved in toluene (0.1M), and the mixed solution was stirred at a temperature of 120 °C for 12 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD26-2] (yield: 80 %).

Synthesis of Intermediate Compound [BD26-3]



[0249] Intermediate Compound [BD26-2] (1.0 eq), [Ir(COD)OMe]2 (1.1 eq), Ag2O (0.5 eq), and sodium tert-butoxide (3.0 eq) were dissolved in 2-ethoxyethanol (0.5 M), and the mixed solution was stirred at a temperature of 120 °C for 10 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD26-3] (yield: 21 %).

Synthesis of Intermediate Compound [BD26-4]



[0250] Intermediate Compound [BD26-3] (1.0 eq) and silver triflate (1.2 eq) were dissolved in acetone (1.0 M), and the mixed solution was stirred at room temperature for 4 hours. After the reaction mixture was subjected to decompression to remove the solvent therefrom, acetonitrile (20 eq) was added thereto and stirred again for 0.5 hours. The solvent was removed therefrom under reduced pressure, and the resulting product was concentrated, so as to synthesize Intermediate Compound [BD26-4] (yield: 81 %).

Synthesis of Intermediate Compound [BD26-5]



[0251] lodobenzene (1.0 eq), benzimidazole (1.2 eq), Cul (0.01 eq), K2CO3 (2.0 eq), and L-proline (0.02 eq) were dissolved in dimethylsulfoxide (0.1 M), and the mixed solution was stirred at a temperature of 160 °C for 48 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD26-5] (yield: 65 %).

Synthesis of Intermediate Compound [BD26-6]



[0252] Intermediate Compound [BD25-5] (1.0 eq) and iodomethane (3.0 eq) were dissolved in THF (1.0 M), and the mixed solution was stirred at a temperature of 70 °C for 12 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Intermediate Compound [BD26-6] (yield: 66 %).

Synthesis of Compound BD26



[0253] Intermediate Compound [BD26-4], Intermediate Compound [BD26-6], and K2CO3 (10.0 eq) were dissolved in 2-ethoxyethanol (0.05 M), and the mixed solution was stirred at a temperature of 120 °C for 10 hours. After the reaction mixture was cooled to room temperature, an extraction process was performed thereon three times using dichloromethane and water, so as to obtain an organic layer. The obtained organic layer was dried by using anhydrous MgSO4, concentrated, and subjected to column chromatography, so as to synthesize Compound [BD26] (yield: 61 %).
1H NMR (400 MHz, CDCl3): δ= 7.97 (d, 2H), 7.61(d, 2H), 7.39 (m, 4H), 7.21 (d, 1H), 7.15 (m, 4H), 7.08 (d, 2H), 6.89 (d, 2H), 6.67 (t, 1H), 3.43 (t, 4H), 3.36 (s, 3H), 2.98 (t, 4H), 1.95 (m, 2H), 1.65 (m, 4H), 1.65 (t, 6H)
LC-MS. Calculated for C47H41IrN6([M]+):m/z 882.10 Found: m/z 882.30

Evaluation Example 1



[0254] According to evaluation methods described in Table 1, the HOMO energy level and the LUMO energy level of each of Compounds BD1, BD8, BD26, ETH7, HTH26, and A were evaluated, and the results are shown in Table 2.
Table 1
HOMO energy level evaluation method Cyclic voltammetry (CV) (electrolyte: 0.1 M Bu4NPF6 / solvent: dimethylformamide (DMF) / electrode: 3-electrode system (working electrode: GC, reference electrode: Ag/AgCl, auxiliary electrode: Pt)) was used to obtain a voltage (V)-current (A) graph for each compound. Then, a HOMO energy level of each compound was calculated from an oxidation onset of the graph.
LUMO energy level evaluation method Cyclic voltammetry (CV) (electrolyte: 0.1 M Bu4NPF6 / solvent: dimethylformamide (DMF) / electrode: 3-electrode system (working electrode: GC, reference electrode: Ag/AgCl, auxiliary electrode: Pt)) was used to obtain a voltage (V)-current (A) graph for each compound. Then, a LUMO energy level of each compound was calculated from a reduction onset of the graph.
Table 2
Compound No.HOMO (eV)LUMO (eV)
BD1 -5.615 -2.125
BD8 -5.648 -2.120
BD26 -5.701 -2.098
ETH7 -5.99 -2.75
HTH26 -5.51 -1.91
Compound A -4.84 -1.16






[0255] Referring to Table 2, it can be seen that Compounds BD1, BD8, BD26, ETH7, and HTH26 had HOMO and LUMO energy levels suitable for the manufacture of an organic light-emitting device.

Example 1



[0256] As an anode, a 15 Ω/cm2 (1,200 Å) glass substrate (a product of Corning Inc.) on which ITO was formed was cut to a size of 50 mm x 50 mm x 0.7 mm, sonicated with isopropyl alcohol and pure water each for 5 minutes, and then cleaned by exposure to ultraviolet rays and ozone for 30 minutes. The resultant glass substrate was loaded onto a vacuum deposition apparatus.

[0257] 2-TNATA was vacuum-deposited on the anode to form a hole injection layer having a thickness of 600 Å, and 4,4'-bis[N-(1-naphthyl)-N-phenyl aminobiphenyl] (hereinafter referred to as NPB) was vacuum-deposited on the hole injection layer to form a hole transport layer having a thickness of 300 Å.

[0258] Compound BD1 as the organometallic compound, Compound ETH7 as the second compound, and Compound HTH26 as the third compound were vacuum-deposited on the hole transport layer to form an emission layer having a thickness of 300 Å. Here, an amount of Compound BD1 was 10 wt% per the total weight (100 wt%) of the emission layer, and a weight ratio of Compound ETH7 and Compound HTH26 was adjusted to 2 : 8.

[0259] Compound ETH7 was vacuum-deposited on the emission layer to form a hole blocking layer having a thickness of 50 Å, Alq3 was vacuum-deposited on the hole blocking layer to form an electron transport layer having a thickness of 300 Å, Yb was vacuum-deposited on the electron transport layer to form an electron injection layer having a thickness of 10 Å, Al was vacuum-deposited on the electron injection layer to form a cathode having a thickness of 3,000 Å, and Compound HT28 was vacuum-deposited on the cathode to form a capping layer having a thickness of 700 Å, thereby completing the manufacture of an organic light-emitting device.






Examples 2 and 3 and Comparative Examples 1 to 4



[0260] Organic light-emitting devices were manufactured in substantially the same manner as in Example 1, except that, in forming an emission layer, compounds shown in Table 3 were used instead of each of the organometallic compound, the second compound, and the third compound.

Evaluation Example 2



[0261] The driving voltage (V) at 1,000 cd/m2, current density (mA/cm2), and luminescence efficiency (cd/A) of the organic light-emitting devices manufactured according to Examples 1 to 3 and Comparative Examples 1 to 4 were each measured by using Keithley MU 236 and luminance meter R650. In addition, the decay time of delayed fluorescence was evaluated based on the time-resolved spectra of the organic light-emitting devices measured by using the Tektronix TDS 460 Four Channel Digitizing Oscilloscope while applying a voltage pulse by using the AVTECCH AV-1011-B pulse generator (wherein a pulse width was between 100 ns and 1 ms), and the results are shown in Table 3.
Table 3
 Organometallic compoundSecond compoundThird compoundDriving voltage (V)Current density (mA/cm2)Luminance (cd/m2)Efficiency (cd/A)Emission wavelength (nm)Time-resolved spectrum (µs)
Example 1 BD1 ETH7 HTH26 4.3 5.3 1000 18.8 469 1.6
Example 2 BD8 ETH7 HTH26 3.3 6.5 1000 16.5 465 2.0
Example 3 BD26 ETH7 HTH26 3.3 4.8 1000 17.2 474 1.8
Comparative Example 1 Compound A ETH7 HTH26 5.4 8.4 1000 12.1 480 2.6
Comparative Example 2 BD1 - HTH26 5.9 5.3 1000 16.2 470 1.6
Comparative Example 3 BD1 ETH7 - 6.8 6.5 1000 12.5 470 1.6
Comparative Example 4 Compound B ETH7 HTH26 6.2 8.8 1000 13.4 482 2.9








[0262] Referring to Table 3, it can be seen that the organic light-emitting devices of Examples 1 to 3 emitted blue light, and compared to the organic light-emitting devices of Comparative Examples 1 to 4, had high efficiency, a long lifespan, and low driving voltage.

[0263] According to the one or more embodiments, an organic light-emitting device may have high luminescence efficiency, high color purity, and a long lifespan.

[0264] It should be understood that embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments. While one or more embodiments have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the present disclosure as defined by the following claims, and equivalents thereof.


Claims

1. An organic light-emitting device comprising:

a first electrode; a second electrode; and an organic layer located between the first electrode and the second electrode and including an emission layer,

wherein the emission layer includes an organometallic compound represented by Formula 1:

         Formula 1     M(L1)(L2)

wherein, in Formula 1,

M is selected from iridium (Ir), cobalt (Co), rhodium (Rh), and meitnerium (Mt);

L1 is a ligand represented by Formula 1-1; and

L2 is a bidentate organic ligand;



wherein, in Formula 1-1, ring A1 and ring A2 are each independently selected from a C5-C30 carbocyclic group and a C1-C30 heterocyclic group,

Y1 to Y4 are each independently selected from N and C,

X11 and X21 are each independently selected from N and C,

X31 is C(R31) or N, X32 is C(R32) or N, X33 is C(R33) or N, X41 is C(R41) or N, X42 is C(R42) or N, and X43 is C(R43) or N,

R1 to R4, R31 to R33, and R41 to R43 are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C7-C60 alkylaryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, a substituted or unsubstituted C1-C60 heteroaryl group, a substituted or unsubstituted C2-C60 alkylheteroaryl group, a substituted or unsubstituted C1-C60 heteroaryloxy group, a substituted or unsubstituted C1-C60 heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and - P(=O)(Q1)(Q2),

a1 and a2 are each independently an integer from 1 to 10,

n is an integer from 2 to 6,

* indicates a binding site to M,

at least one substituent of the substituted C1-C60 alkyl group, the substituted C2-C60 alkenyl group, the substituted C2-C60 alkynyl group, the substituted C1-C60 alkoxy group, the substituted C3-C10 cycloalkyl group, the substituted C1-C10 heterocycloalkyl group, the substituted C3-C10 cycloalkenyl group, the substituted C1-C10 heterocycloalkenyl group, the substituted C6-C60 aryl group, the substituted C7-C60 alkylaryl group, the substituted C6-C60 aryloxy group, the substituted C6-C60 arylthio group, the substituted C1-C60 heteroaryl group, the substituted C2-C60 alkylheteroaryl group, the substituted C1-C60 heteroaryloxy group, the substituted C1-C60 heteroarylthio group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is selected from:

deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group;

a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group, each substituted with at least one selected from deuterium, -F, -Cl, - Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, -O(Q11), -S(Q11), -Si(Q11)(Q12)(Q13), -N(Q11)(Q12), -B(Q11)(Q12), -C(=O)(Q11), - S(=O)2(Q11), and -P(=O)(Q11)(Q12);

a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;

a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, -O(Q21), -S(Q21), - Si(Q21)(Q22)(Q23), -N(Q21)(Q22), -B(Q21)(Q22), -C(=O)(Q21), -S(=O)2(Q21), and - P(=O)(Q21)(Q22); and

-O(Q31), -S(Q31), -Si(Q31)(Q32)(Q33), -N(Q31)(Q32), -B(Q31)(Q32), -C(=O)(Q31), - S(=O)2(Q31), and -P(=O)(Q31)(Q32), and

Q1 to Q3, Q11 to Q13, Q21 to Q23, and Q31 to Q33 are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C1-C60 alkyl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C60 alkyl group, a phenyl group, a biphenyl group, and a terphenyl group, and a C6-C60 aryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C10 alkyl group, a phenyl group, and a biphenyl group.


 
2. An organic light-emitting device according to claim 1, wherein the organic layer includes emission layers in the number of p,
p is an integer of 2 or more, and
two or more emission layers among the emission layers in the number of p comprise the organometallic compound represented by Formula 1.
 
3. An organic light-emitting device according to claim 1 or claim 2, wherein the emission layer includes a first emission layer to emit a first-color light, a second emission layer to emit a second-color light, and a third emission layer to emit a third-color light,
the first-color light, the second-color light, and the third-color light each have different maximum luminescence wavelengths from each other,
the first-color light is blue, the second-color light is green, and the third-color light is red, and
the first emission layer comprises the organometallic compound represented by Formula 1.
 
4. An organic light-emitting device according to any one of claims 1 to 3, wherein the emission layer further comprises a second compound and a third compound,
the organometallic compound, the second compound, and the third compound are each different from each other,
the second compound and the third compound form an exciplex, and
the organometallic compound and the second compound and/or the third compound do not form an exciplex.
 
5. An organic light-emitting device according to claim 4, wherein the organometallic compound, the second compound, and the third compound each satisfy <Condition 1> to <Condition 4>:

<Condition 1> Lowest unoccupied molecular orbital (LUMO) energy level (eV) of the third compound is greater than LUMO energy level (eV) of the organometallic compound

<Condition 2> LUMO energy level (eV) of the organometallic compound is greater than LUMO energy level (eV) of the second compound

<Condition 3> Highest occupied molecular orbital (HOMO) energy level (eV) of the organometallic compound is greater than HOMO energy level (eV) of the third compound

<Condition 4> HOMO energy level (eV) of the third compound is greater than HOMO energy level (eV) of the second compound.


 
6. An organic light-emitting device according to claim 4 or claim 5, wherein the second compound is represented by Formula 2, and
the third compound includes a group represented by Formula 3:



wherein, in Formulae 2 and 3,

ring CY51 to ring CY53, ring CY71, and ring CY72 are each independently selected from a C5-C30 carbocyclic group and a C1-C30 heterocyclic group,

L51 to L53 are each independently selected from a substituted or unsubstituted C5-C30 carbocyclic group and a substituted or unsubstituted C1-C30 heterocyclic group,

a bond between L51 and ring CY51, a bond between L52 and ring CY52, a bond between L53 ring CY53, a bond between two or more L51(s), a bond between two or more L52(s), a bond between two or more L53(s), a bond between L51 and carbon between X54 and X55 in Formula 2, a bond between L52 and carbon between X54 and X56 in Formula 2, and a bond between L53 and carbon between X55 and X56 in Formula 2 are each a carbon-carbon single bond,

b51 to b53 are each independently an integer from 0 to 5, wherein, when b51 is 0, *-(L51)b51-*' is a single bond, when b52 is 0, *-(L52)b52-*' is a single bond, and when b53 is 0, *-(L53)b53-*' is a single bond,

X54 is N or C(R54), X55 is N or C(R55), X56 is N or C(R56), and at least one selected from X54 to X56 is N,

X81 is a single bond, O, S, N(R81), B(R81), C(R81a)(R81b), or Si(R81a)(R81b),

R51 to R56, R71, R72, R81, R81a, and R81b are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C7-C60 alkylaryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, a substituted or unsubstituted C1-C60 heteroaryl group, a substituted or unsubstituted C2-C60 alkylheteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -Si(Q1)(Q2)(Q3), -N(Q1)(Q2), - B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and -P(=O)(Q1)(Q2),

a51 to a53, a71, and a72 are each independently an integer from 0 to 10,

at least one substituent of the substituted C5-C30 carbocyclic group, the substituted, a C1-C30 heterocyclic group, the substituted C1-C60 alkyl group, the substituted C2-C60 alkenyl group, the substituted C2-C60 alkynyl group, the substituted C1-C60 alkoxy group, the substituted C3-C10 cycloalkyl group, the substituted C1-C10 heterocycloalkyl group, the substituted C3-C10 cycloalkenyl group, the substituted C1-C10 heterocycloalkenyl group, the substituted C6-C60 aryl group, the substituted C7-C60 alkylaryl group, the substituted C6-C60 aryloxy group, the substituted C6-C60 arylthio group, the substituted C1-C60 heteroaryl group, the substituted C2-C60 alkylheteroaryl group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is selected from:

deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group,

a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group, each substituted with at least one selected from deuterium, -F, -Cl, - Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, -Si(Q11)(Q12)(Q13), -N(Q11)(Q12), -B(Q11)(Q12), -C(=O)(Q11), -S(=O)2(Q11), and - P(=O)(Q11)(Q12);

a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;

a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, -Si(Q21)(Q22)(Q23), - N(Q21)(Q22), -B(Q21)(Q22), -C(=O)(Q21), -S(=O)2(Q21), and -P(=O)(Q21)(Q22); and

-Si(Q31)(Q32)(Q33), -N(Q31)(Q32), -B(Q31)(Q32), -C(=O)(Q31), -S(=O)2(Q31), and - P(=O)(Q31)(Q32), and

Q1 to Q3, Q11 to Q13, Q21 to Q23, and Q31 to Q33 are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a biphenyl group, and a terphenyl group.


 
7. An organic light-emitting device according to claim 6, wherein, in Formulae 2 and 3, ring CY51 to ring CY53, ring CY71, and ring CY72 are each independently selected from i) a first ring, ii) a second ring, iii) a condensed ring in which two or more first rings are condensed with each other, iv) a condensed ring in which two or more second rings are condensed with each other, and v) a condensed ring in which one or more first rings and one or more second rings are condensed with each other,
the first ring is selected from a cyclopentane group, a cyclopentadiene group, a furan group, a thiophene group, a pyrrole group, a silole group, an oxazole group, an isoxazole group, an oxadiazole group, an isoxadiazole group, an oxatriazole group, an isoxatriazole group, a thiazole group, an isothiazole group, a thiadiazole group, an isothiadiazole group, a thiatriazole group, an isothiatriazole group, a pyrazole group, an imidazole group, a triazole group, a tetrazole group, an azasilole group, a diazasilole group, and a triazasilole group, and
the second ring is selected from an adamantane group, a norbornane group, a norbornene group, a cyclohexane group, a cyclohexene group, a benzene group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, an oxasiline group, a thiasiline group, a dihydroazasiline group, a dihydrodisiline group, a dihydrosiline group, a dioxine group, an oxathiine group, an oxazine group, a pyran group, a dithiine group, a thiazine group, a thiopyran group, a cyclohexadiene group, a dihydropyridine group, and a dihydropyrazine group.
 
8. An organic light-emitting device according to claim 6 or claim 7, wherein, in Formulae 2 and 3, R51 to R56, R71, R72, R81, R81a, and R81b are each independently selected from:

hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, and a C1-C60 alkoxy group;

a C1-C60 alkyl group and a C1-C60 alkoxy group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a naphthyl group, a pyridinyl group, and a pyrimidinyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, and an indolocarbazolyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, an indolocarbazolyl group, and a group represented by Formula 91, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C1-C60 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, an indolocarbazolyl group, -Si(Q31)(Q32)(Q33), -N(Q31)(Q32), - B(Q31)(Q32), -C(=O)(Q31), -S(=O)2(Q31), and -P(=O)(Q31)(Q32); and

-Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and - P(=O)(Q1)(Q2), and

Q1 to Q3 and Q31 to Q33 are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C1-C60 alkyl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C60 alkyl group, a phenyl group, and a biphenyl group, a C6-C60 aryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C10 alkyl group, a phenyl group, and a biphenyl group, and a C1-C60 heteroaryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C10 alkyl group, a phenyl group, and a biphenyl group:

wherein, in Formula 91,

ring CY91 and ring CY92 are each independently selected from a C5-C30 carbocyclic group and a C1-C30 heterocyclic group,

X91 is a single bond, O, S, N(R91), B(R91), C(R91a)(R91b), or Si(R91a)(R91b),

R91, R91a, and R91b are each independently the same as described in connection with R81, R81a, and R81b, respectively, in claim 6, and

* indicates a binding site to a neighboring atom.


 
9. An organic light-emitting device according to any one of claims 6 to 8, wherein the third compound is represented by one of Formulae 3-1 to 3-5:







wherein, in Formulae 3-1 to 3-5,

ring CY71, ring CY72, X81, R71, R72, a71, and a72 are each independently the same as described in claim 6,

ring CY73, ring CY74, R73, R74, a73, and a74 are each independently the same as described in connection with ring CY71, ring CY72, R71, R72, a71, and a72, respectively, in claim 6,

L81 is selected from *-C(Q4)(Q5)-*', *-Si(Q4)(Q5)-*', a substituted or unsubstituted C5-C30 carbocyclic group, and a substituted or unsubstituted C1-C30 heterocyclic group, wherein Q4 and Q5 are each independently the same as described in connection with Q1 in claim 6,

b81 is an integer from 0 to 5, wherein, when b81 is 0, *-(L81)b81-*' is a single bond, and when b81 is 2 or more, two or more L81(s) are identical to or different from each other,

X82 is a single bond, O, S, N(R82), B(R82), C(R82a)(R82b), or Si(R82a)(R82b),

X83 is a single bond, O, S, N(R83), B(R83), C(R83a)(R83b), or Si(R83a)(R83b),

in Formulae 3-2 and 3-4, X82 and X83 are not each a single bond at the same time,

X84 is C or Si,

R80, R82, R83, R82a, R82b, R83a, R83b, and R84 are each independently the same as described in connection with R81 in claim 6, and

* and *' each indicate a binding site to a neighboring atom.


 
10. The organic light-emitting device of claim 6, wherein the second compound is selected from Compounds ETH1 to ETH80, and
the third compound is selected from Compounds HTH1 to HTH28, and


















































 
11. An organometallic compound represented by Formula 1:

         Formula 1      M(L1)(L2)

wherein, in Formula 1,

M is selected from iridium (Ir), cobalt (Co), rhodium (Rh), and meitnerium (Mt);

L1 is a ligand represented by Formula 1-1; and

L2 is a bidentate organic ligand,



wherein, in Formula 1-1, ring A1 and ring A2 are each independently selected from a C5-C30 carbocyclic group and a C1-C30 heterocyclic group,

Y1 to Y4 are each independently selected from N and C,

X11 and X21 are each independently selected from N and C,

X31 is C(R31) or N, X32 is C(R32) or N, X33 is C(R33) or N, X41 is C(R41) or N, X42 is C(R42) or N, and X43 is C(R43) or N,

R1 to R4, R31 to R33, and R41 to R43 are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C7-C60 alkylaryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, a substituted or unsubstituted C1-C60 heteroaryl group, a substituted or unsubstituted C2-C60 alkylheteroaryl group, a substituted or unsubstituted C1-C60 heteroaryloxy group, a substituted or unsubstituted C1-C60 heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and - P(=O)(Q1)(Q2),

a1 and a2 are each independently an integer from 1 to 10,

n is an integer from 2 to 6,

* indicates a binding site to M,

at least one substituent of the substituted C1-C60 alkyl group, the substituted C2-C60 alkenyl group, the substituted C2-C60 alkynyl group, the substituted C1-C60 alkoxy group, the substituted C3-C10 cycloalkyl group, the substituted C1-C10 heterocycloalkyl group, the substituted C3-C10 cycloalkenyl group, the substituted C1-C10 heterocycloalkenyl group, the substituted C6-C60 aryl group, the substituted C7-C60 alkylaryl group, the substituted C6-C60 aryloxy group, the substituted C6-C60 arylthio group, the substituted C1-C60 heteroaryl group, the substituted C2-C60 alkylheteroaryl group, the substituted C1-C60 heteroaryloxy group, the substituted C1-C60 heteroarylthio group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is selected from:

deuterium, -F, -CI, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group,

a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, and a C1-C60 alkoxy group, each substituted with at least one selected from deuterium, -F, -Cl, - Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, -O(Q11), -S(Q11), -Si(Q11)(Q12)(Q13), -N(Q11)(Q12), -B(Q11)(Q12), -C(=O)(Q11), - S(=O)2(Q11), and -P(=O)(Q11)(Q12);

a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;

a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from deuterium, -F, -CI, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C7-C60 alkylaryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a C2-C60 alkylheteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, -O(Q21), -S(Q21), - Si(Q21)(Q22)(Q23), -N(Q21)(Q22), -B(Q21)(Q22), -C(=O)(Q21), -S(=O)2(Q21), and - P(=O)(Q21)(Q22); and

-O(Q31), -S(Q31), -Si(Q31)(Q32)(Q33), -N(Q31)(Q32), -B(Q31)(Q32), -C(=O)(Q31), - S(=O)2(Q31), and -P(=O)(Q31)(Q32), and

Q1 to Q3, Q11 to Q13, Q21 to Q23, and Q31 to Q33 are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C1-C60 alkyl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C60 alkyl group, a phenyl group, a biphenyl group, and a terphenyl group, and a C6-C60 aryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C10 alkyl group, a phenyl group, and a biphenyl group.


 
12. An organometallic compound according to claim 11, wherein ring A1 and ring A2 are each independently selected from i) a first ring, ii) a second ring, iii) a condensed ring in which two or more first rings are condensed with each other, iv) a condensed ring in which two or more second rings are condensed with each other, and v) a condensed ring in which one or more first rings and one or more second rings are condensed with each other,
the first ring is selected from a cyclopentane group, a cyclopentene group, a cyclopentadiene group, a furan group, a thiophene group, a pyrrole group, a borole group, a phosphole group, a silole group, a germole group, a selenophene group, an oxazole group, an isoxazole group, an oxadiazole group, an isoxadiazole group, an oxatriazole group, an isoxatriazole group, a thiazole group, an isothiazole group, a thiadiazole group, an isothiadiazole group, a thiatriazole group, an isothiatriazole group, a pyrazole group, an imidazole group, a triazole group, a tetrazole group, an azasilole group, a diazasilole group, and a triazasilole group, and
the second ring is selected from a cyclohexane group, a cyclohexene group, a cyclohexadiene group, an adamantane group, a norbornane group, a norbornene group, a benzene group, a pyridine group, a dihydropyridine group, a tetrahydropyridine group, a pyrimidine group, a dihydropyrimidine group, a tetrahydropyrimidine group, a pyrazine group, a dihydropyrazine group, a tetrahydropyrazine group, a pyridazine group, a dihydropyridazine group, a tetrahydropyridazine group, a triazine group, an oxasiline group, a thiasiline group, a dihydroazasiline group, a dihydrodisiline group, a dihydrosiline group, a dioxine group, an oxathiine group, an oxazine group, a pyran group, a dithiine group, a thiazine group, and a thiopyran group.
 
13. An organometallic compound according to claim 11 or claim 12, wherein two selected from Y1 to Y4 are each N, and the other two are each C.
 
14. An organometallic compound according to any one of claims 11 to 13, wherein R1 to R4, R31 to R33, and R41 to R43 are each independently selected from:

hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, and a C1-C60 alkoxy group;

a C1-C60 alkyl group and a C1-C60 alkoxy group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a naphthyl group, a pyridinyl group, and a pyrimidinyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, and an indolocarbazolyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, and an indolocarbazolyl group, each substituted with at least one selected from deuterium, -F, -CI, -Br, -I, -CD3, -CD2H, - CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C1-C60 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, an indolocarbazolyl group, - Si(Q31)(Q32)(Q33), -N(Q31)(Q32), -B(Q31)(Q32), -C(=O)(Q31), -S(=O)2(Q31), and - P(=O)(Q31)(Q32); and

-Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and - P(=O)(O1)(O2), and

Q1 to Q3 and Q31 to Q33 are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C1-C60 alkyl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C60 alkyl group, a phenyl group, and a biphenyl group, a C6-C60 aryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C10 alkyl group, a phenyl group, and a biphenyl group, and a C1-C60 heteroaryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C10 alkyl group, a phenyl group, and a biphenyl group.


 
15. An organometallic compound according to any one of claims 11 to 14, wherein L1 is a ligand represented by Formula 1-1A:



wherein, in Formula 1-1A,

Y1, Y2, Y3, Y4, n, R3, R4, R31, R32, R33, R41, R42, and R43 are each independently the same as described in claim 11,

R1a, R1b, and R1c are each independently the same as described in connection with R1 in claim 11,

R2a, R2b, and R2c are each independently the same as described in connection with R2 in claim 11, and

R32 and R42 are the same as each other.


 
16. An organometallic compound according to claim 15, wherein R1a, R1c, R2a, and R2c are each independently selected from:

hydrogen, deuterium, -F, -CI, -Br, -I, a cyano group, and a C1-C10 alkyl group;

a C1-C10 alkyl group substituted with at least one selected from deuterium, -F, - Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, and a cyano group;

a cyclopentyl group, a cyclohexyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, and a biphenyl group; and

a cyclopentyl group, a cyclohexyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, and a biphenyl group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, a cyano group, a C1-C10 alkyl group, a cyclopentyl group, a cyclohexyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, and a biphenyl group.


 
17. An organometallic compound according to any one of claims 11 to 16, wherein L2 is a ligand represented by Formula 1-2A or 1-2B:

wherein, in Formulae 1-2A and 1-2B,

A3 and A4 are each independently selected from a C5-C30 carbocyclic group and a C1-C30 heterocyclic group,

Y5 is C or N,

X51 is C or N,

R5, R6, R7, R8, and R9 are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a substituted or unsubstituted C1-C60 alkyl group, a substituted or unsubstituted C2-C60 alkenyl group, a substituted or unsubstituted C2-C60 alkynyl group, a substituted or unsubstituted C1-C60 alkoxy group, a substituted or unsubstituted C3-C10 cycloalkyl group, a substituted or unsubstituted C1-C10 heterocycloalkyl group, a substituted or unsubstituted C3-C10 cycloalkenyl group, a substituted or unsubstituted C1-C10 heterocycloalkenyl group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C7-C60 alkylaryl group, a substituted or unsubstituted C6-C60 aryloxy group, a substituted or unsubstituted C6-C60 arylthio group, a substituted or unsubstituted C1-C60 heteroaryl group, a substituted or unsubstituted C2-C60 alkylheteroaryl group, a substituted or unsubstituted C1-C60 heteroaryloxy group, a substituted or unsubstituted C1-C60 heteroarylthio group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, -Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and - P(=O)(Q1)(Q2),

a5 is an integer from 0 to 10, and

a9 is an integer from 1 to 10.


 
18. An organometallic compound according to claim 17, wherein ring A3 and ring A4 are each independently selected from i) a first ring, ii) a second ring, iii) a condensed ring in which two or more first rings are condensed with each other, iv) a condensed ring in which two or more second rings are condensed with each other, and v) a condensed ring in which one or more first rings and one or more second rings are condensed with each other,
the first ring is selected from a cyclopentane group, a cyclopentene group, a cyclopentadiene group, a furan group, a thiophene group, a pyrrole group, a borole group, a phosphole group, a silole group, a germole group, a selenophene group, an oxazole group, an isoxazole group, an oxadiazole group, an isoxadiazole group, an oxatriazole group, an isoxatriazole group, a thiazole group, an isothiazole group, a thiadiazole group, an isothiadiazole group, a thiatriazole group, an isothiatriazole group, a pyrazole group, an imidazole group, a triazole group, a tetrazole group, an azasilole group, a diazasilole group, and a triazasilole group, and
the second ring is selected from a cyclohexane group, a cyclohexene group, a cyclohexadiene group, an adamantane group, a norbornane group, a norbornene group, a benzene group, a pyridine group, a dihydropyridine group, a tetrahydropyridine group, a pyrimidine group, a dihydropyrimidine group, a tetrahydropyrimidine group, a pyrazine group, a dihydropyrazine group, a tetrahydropyrazine group, a pyridazine group, a dihydropyridazine group, a tetrahydropyridazine group, a triazine group, an oxasiline group, a thiasiline group, a dihydroazasiline group, a dihydrodisiline group, a dihydrosiline group, a dioxine group, an oxathiine group, an oxazine group, a pyran group, a dithiine group, a thiazine group, and a thiopyran group.
 
19. An organometallic compound according to claim 17 or claim 18, wherein R5, R6, R7, R8, and R9 are each independently selected from:

hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, and a C1-C60 alkoxy group;

a C1-C60 alkyl group and a C1-C60 alkoxy group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, -CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a pyridinyl group, and a pyrimidinyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, and an indolocarbazolyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, and an indolocarbazolyl group, each substituted with at least one selected from deuterium, -F, -Cl, -Br, -I, -CD3, -CD2H, - CDH2, -CF3, -CF2H, -CFH2, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C1-C60 alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a biphenyl group, a terphenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a perylenyl group, a pentacenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a silolyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, an isoindolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a benzoisoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a benzoquinoxalinyl group, a quinazolinyl group, a benzoquinazolinyl group, a cinnolinyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, a benzosilolyl group, a benzothiazolyl group, a benzoisothiazolyl group, a benzoxazolyl group, a benzoisoxazolyl group, a triazolyl group, a tetrazolyl group, a thiadiazolyl group, an oxadiazolyl group, a triazinyl group, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a benzocarbazolyl group, a naphthobenzofuranyl group, a naphthobenzothiophenyl group, a naphthobenzosilolyl group, a dibenzocarbazolyl group, a dinaphthofuranyl group, a dinaphthothiophenyl group, a dinaphtho silolyl group, an imidazopyridinyl group, an imidazopyrimidinyl group, an oxazolopyridinyl group, a thiazolopyridinyl group, a benzonaphthyridinyl group, an azafluorenyl group, an azaspiro-bifluorenyl group, an azacarbazolyl group, an azadibenzofuranyl group, an azadibenzothiophenyl group, an azadibenzosilolyl group, an indenopyrrolyl group, an indolopyrrolyl group, an indeno carbazolyl group, an indolocarbazolyl group, - Si(Q31)(Q32)(Q33), -N(Q31)(Q32), -B(Q31)(Q32), -C(=O)(Q31), -S(=O)2(Q31), and - P(=O)(Q31)(Q32); and

-Si(Q1)(Q2)(Q3), -N(Q1)(Q2), -B(Q1)(Q2), -C(=O)(Q1), -S(=O)2(Q1), and - P(=O)(Q1)(Q2), and

Q1 to Q3 and Q31 to Q33 are each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C1-C60 alkyl group, a C2-C60 alkenyl group, a C2-C60 alkynyl group, a C1-C60 alkoxy group, a C3-C10 cycloalkyl group, a C1-C10 heterocycloalkyl group, a C3-C10 cycloalkenyl group, a C1-C10 heterocycloalkenyl group, a C6-C60 aryl group, a C6-C60 aryloxy group, a C6-C60 arylthio group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a C1-C60 alkyl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C60 alkyl group, a phenyl group, and a biphenyl group, a C6-C60 aryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C10 alkyl group, a phenyl group, and a biphenyl group, and a C1-C60 heteroaryl group that is substituted with at least one selected from deuterium, -F, a cyano group, a C1-C10 alkyl group, a phenyl group, and a biphenyl group.


 
20. An organometallic compound according to claim 11, wherein the organometallic compound represented by Formula 1 is selected from Compounds BD1 to BD36:








 




Drawing
















Search report









Search report