Patent ID: 7183008
Filing Date: 2007-02-27
Classification: C09K,H01L,H05B,Y10S

Abstract:
1. An electroluminescent device which comprises (i) a transparent substrate (ii) an electroluminescent layer comprising an electroluminescent compound which comprises an organic complex of a metal selected from the group consisting of thorium (IV), yttrium (III), gadolinium (III), europium (II), terbium (III), cerium (IV) and mixtures thereof and an organic ligand which electroluminescent compound emits light in the blue or purplish blue spectrum when an electric current is passed through it and in which the organic ligand has the formula where R′ may be the same or different at different parts of the molecule and each of R″ and R′ is a substituted or unsubstituted aromatic or heterocyclic ring structure or a hydrocarbyl or a fluorocarbon or R″ is fluorine or hydrogen or R″ is copolymerised with a monomer or is an alkyl group optionally a —C(CH 3 ) group, or the ligand is selected from TMHD, α′, α″, α′″ tripyridyl bathophen (4,7-diphenyl-1,10-phenanthroline), crown ethers and cryptands and (iii) a cathode.