EP 2158291 A2 20100303 - USE OF A LUMINOPHORE AS SECURITY FEATURE, SECURITY PRINTING INK, METHOD AND DEVICE FOR CHECKING A DOCUMENT AND DOCUMENT AND SECURITY FEATURE
Title (en)
USE OF A LUMINOPHORE AS SECURITY FEATURE, SECURITY PRINTING INK, METHOD AND DEVICE FOR CHECKING A DOCUMENT AND DOCUMENT AND SECURITY FEATURE
Title (de)
VERWENDUNG EINES LEUCHTSTOFFS ALS SICHERHEITSMERKMAL, SICHERHEITSDRUCKFARBE, VERFAHREN UND VORRICHTUNG ZUM ÜBERPRÜFEN EINES DOKUMENTS SOWIE DOKUMENT UND SICHERHEITSMERKMAL
Title (fr)
UTILISATION D'UNE SUBSTANCE LUMINESCENTE COMME MARQUE DE SÉCURITÉ, ENCRE D'IMPRIMERIE DE SÉCURITÉ, PROCÉDÉ ET DISPOSITIF DE VÉRIFICATION D'UN DOCUMENT ET DOCUMENT ET MARQUE DE SÉCURITÉ
Publication
Application
Priority
- EP 2008055296 W 20080430
- AT 6752007 A 20070430
Abstract (en)
[origin: WO2008132223A2] The invention relates to the use of a luminophore of formula (Y<SUB>1-x-y</SUB>Yb<SUB>x</SUB>Er<SUB>y</SUB>)<SUB>2</SUB>O<SUB>3</SUB> where x = 0.20 and y = 0.075 as security feature with anti-Stokes luminescence. Said luminophores, on stimulation with IR laser, display two peaks in the 540 nm and 670 nm region, the intensity ratio of which varies strongly and does not only depend on the proportion of Yb and Er but, for example also on the particle size. When the luminophore is present in the form of nanoparticles, preferably with a particle size of 0.1-0.5 µm, not only is the peak at 670 nm favoured but the advantage that the nanoparticles are not visible under normal light and the print quality is not affected is achieved. Security print inks with such a luminophore are also disclosed, furthermore, a method and a device for checking a document and a document with such a luminophore as security feature.
IPC 8 full level
C09K 11/77 (2006.01); G07D 7/12 (2006.01)
CPC (source: EP US)
B41M 3/144 (2013.01 - EP); B42D 25/00 (2014.10 - EP); B42D 25/29 (2014.10 - EP); B42D 25/378 (2014.10 - US); C09D 11/50 (2013.01 - EP); C09K 11/7769 (2013.01 - EP); G07D 7/1205 (2017.04 - EP); B42D 25/382 (2014.10 - EP); B42D 2033/20 (2022.01 - EP)
Citation (search report)
See references of WO 2008132223A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
AT 505007 A4 20081015; AT 505007 B1 20081015; EP 2158291 A2 20100303; WO 2008132223 A2 20081106; WO 2008132223 A3 20090115
DOCDB simple family (application)
AT 6752007 A 20070430; EP 08749892 A 20080430; EP 2008055296 W 20080430