Patent ID: 7193088

Claim:
An organic light emitting diode device, comprising: an anode and a cathode; and an electroluminescent medium disposed between the anode and the cathode, wherein the electroluminescent medium comprises a light-emitting layer comprising a phosphorescent iridium complex of Formula (I) or Formula (II): wherein: X is chosen from a monoanionic bidentate ligand; Z is chosen from an atomic group wherein Z together with the buta-1,3-diene to which Z is attached form an aryl group or a heteroaryl group; R is chosen from C 2 –C 20 alkyl, C 2 –C 20 alkenyl, C 2 –C 20 alkynyl, halogen-substituted C 2 –C 20 alkyl, C 1 –C 20 alkoxy, C 1 –C 20 alkyl substituted amino, C 1 –C 20 acyl, C 1 –C 20 ester, C 1 –C 20 amide, halogen-substituted alkenyl, haloalkyl-substituted alkenyl, and aryl-substituted C 1 –C 20 alkyl; R 1 and R 2 are independently chosen from H, halogen, C 1 –C 20 alkyl, C 2 –C 20 alkenyl, C 2 –C 20 alkynyl, halogen-substituted C 1 –C 20 alkyl, C 1 –C 20 alkoxy, C 1 –C 20 alkyl substituted amino, C 1 –C 20 acyl, C 1 –C 20 ester, C 1 –C 20 amide, aryl, halogen-substituted aryl, halogen-substituted alkenyl, haloalkyl-substituted aryl, haloalkyl-substituted alkenyl, aryl-substituted C 1 –C 20 alkyl, cyano, and nitro; m is an integer from 0 to 4; and n is an integer from 0 to the maximum number of possible substituents on Z.