Patent ID: 8692241

Claim:
A compound having the formula: wherein n=1, 2 or 3; wherein X 1 -X 2 is a first bidentate ligand having the formula: wherein each of Z 1 and Z 2 is N or CR 2 ; wherein at least one of Z 1 and Z 2 is N; wherein each of Z 3 , Z 4 , Z 5 and Z 6 is independently selected from group consisting of C, CR 3 and N; wherein ring C is a five-member carbocyclic or heterocyclic ring fused to ring B; wherein R 4 may represent mono, di-substitutions, or no substitution; wherein R 1 , R 2 , R 3 and R 4 are independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; wherein any two adjacent R 4 are optionally joined to form a ring; wherein ring A is connected to ring B through an N—C bond; and wherein Y 1 -Y 2 is a second bidentate ligand.