Patent ID: 8481173

Claim:
An organometallic complex represented by Formula 1: ML 2 L′ (1) where M is Ir; L 2 and L′ are different bidentate ligands; and ML 2 of Formula 1 is represented by one of Formulas 4, 5, and 7 through 9: where, R 1 , R 2 , R 3 and R 4 are each independently at least one selected from the group consisting of hydrogen, a halogen atom, a carboxyl group, an amino group, a nitro group, a cyano group, a substituted or unsubstituted C 1 -C 20 alkyl group, a substituted or unsubstituted C 1 -C 20 alkoxy group, a substituted or unsubstituted C 2 -C 20 alkenyl, a substituted or unsubstituted C 2 -C 20 alkynyl group, a substituted or unsubstituted C 1 -C 20 heteroalkyl group, a substituted or unsubstituted C 6 -C 30 aryl group, a substituted or unsubstituted C 7 -C 30 arylalkyl group, a substituted or unsubstituted C 5 -C 30 heteroaryl group, and a substituted or unsubstituted C 3 -C 30 heteroarylalkyl group.