EP 1181342 A1 20020227 - COATED PHOSPHORS
Title (en)
COATED PHOSPHORS
Title (de)
BESCHICHTETER PHOSPHOR
Title (fr)
PHOSPHORES REVETUS
Publication
Application
Priority
- GB 0001957 W 20000522
- GB 9911781 A 19990520
Abstract (en)
[origin: WO0071637A1] A process for preparing phosphor particles of a doped host oxide is described which comprises: preparing an aqueous solution of oxides of the host ion and of the dopant ion with sufficient strong acid to provide a pH less than 0.5, increasing the pH of the solution by the addition of a base comprising a Group 1A metal while maintaining the oxides in solution, adding a water soluble compound which decomposes under the reaction conditions to convert the material into hydroxy carbonate, heating the solution so as to cause said compound to decompose, recovering the resulting precipitate and calcining it at a temperature which is at least 500 DEG C.
IPC 1-7
IPC 8 full level
C01G 33/00 (2006.01); C01F 17/00 (2006.01); C09K 11/08 (2006.01); C09K 11/62 (2006.01); C09K 11/64 (2006.01); C09K 11/67 (2006.01); C09K 11/68 (2006.01); C09K 11/77 (2006.01); C09K 11/78 (2006.01)
CPC (source: EP)
C09K 11/621 (2013.01); C09K 11/623 (2013.01); C09K 11/641 (2013.01); C09K 11/671 (2013.01); C09K 11/672 (2013.01); C09K 11/676 (2013.01); C09K 11/681 (2013.01); C09K 11/682 (2013.01); C09K 11/685 (2013.01); C09K 11/7701 (2013.01); C09K 11/7702 (2013.01); C09K 11/7708 (2013.01); C09K 11/7717 (2013.01); C09K 11/7729 (2013.01); C09K 11/773 (2013.01); C09K 11/7744 (2013.01); C09K 11/7745 (2013.01); C09K 11/776 (2013.01); C09K 11/7764 (2013.01); C09K 11/7767 (2013.01); C09K 11/7769 (2013.01); C09K 11/7785 (2013.01); C09K 11/7787 (2013.01)
Citation (search report)
See references of WO 0071637A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0071637 A1 20001130; AU 5085500 A 20001212; EP 1181342 A1 20020227; GB 9911781 D0 19990721; JP 2003500516 A 20030107
DOCDB simple family (application)
GB 0001957 W 20000522; AU 5085500 A 20000522; EP 00935301 A 20000522; GB 9911781 A 19990520; JP 2000620019 A 20000522