Patent ID: 8062767

Claim:
An organic light emitting diode, comprising: a positive electrode formed on a substrate; an electroluminescent medium formed on said positive electrode; and a negative electrode formed on said electroluminescent medium; wherein said electroluminescent medium comprises an emitter and said emitter comprises a phosphorescent Ir complex that comprises the structure shown by a ligand: in which Y is any atomic group that Y and the neighboring N=C form a nitrogen containing heterocyclic ring group (hereinafter referred to as N containing heterocyclic ring group) and c is 0 or any positive integer that depends on said N and Y containing heterocyclic ring group; said N containing heterocyclic ring group is quinoline, isoquinoline, pyrazine, pyrimidine, pyrrole, pyrazole, imidazole, indole, thiazole, isothiazole, oxazole, isoxazole, benzothiazole, benzoxazole, or phenanthroline; wherein R 4 , or R 5 independently represents a halogen atom, aryl, C1˜C20 alkyl, aryl substituted C1˜C20 alkyl, C2˜C20 alkenyl, C2-C20 alkynyl, halogen substituted C1˜C20 alkyl, C1˜C20 alkoxyl, C1˜C20 substituted amino, C1˜C20 acyl, C1-C20 ester, C1˜C20 amido, halogen substituted aryl, halogen substituted aralkyl, haloalkyl group substituted aryl, haloalkyl group substituted aralkyl, cyano, or nitro group; and said aryl group represents phenyl, naphthyl, diphenyl, anthryl, pyrenyl, phenanthryl, or fluorenyl group.