Patent ID: 8367223

Claim:
A heteroleptic iridium compound Ir(L1) n (L2) 3-n having the formula: wherein n=1 or 2; wherein is L1; wherein is L2; wherein R 2 , R 3 , R 4 and R 5 may represent mono, di, tri, or tetra substitutions; and wherein R 2 , R 3 , R 4 , and R 5 are each independently selected from the group consisting of hydrogen, alkyl, heteroalkyl, aryl, substituted aryl, heteroaryl, and substituted heteroaryl; wherein R 1 is wherein X 1 and X 2 are independently selected from C and N; wherein Y 1 is not hydrogen; and wherein Y 1 may be joined to other substituents on the aryl ring.