Patent ID: 8519384

Claim:
A compound comprising a ligand L having the structure: wherein B and C are each independently a 5 or 6-membered carbocyclic or heterocyclic ring; wherein A-B represents a bonded pair of carbocyclic or heterocyclic rings coordinated to a metal M via a nitrogen atom in ring A and an sp 2 hybridized atom in ring B; wherein A-C represents a bonded pair of carbocyclic or heterocyclic rings; wherein R a , R b , and R c may represent mono, di, tri, or tetra substitutions; wherein R a , R b , and R c are independently selected from the group consisting of hydrogen, alkyl, alkoxy, amino, alkenyl, alkynyl, arylkyl, aryl, and heteroaryl; wherein X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , and X 9 are independently selected from carbon and nitrogen; wherein R 1 and R 2 are independently selected from the group consisting of hydrogen, alkyl, alkoxy, amino, alkenyl, alkynyl, arylkyl, aryl, and heteroaryl; and wherein at least one of R 1 , R 2 , and the R a substituents adjacent to C is not hydrogen; and wherein the ligand L is coordinated to a metal M having an atomic number greater than 40.