Patent ID: 8507679

Claim:
A heteroleptic, dual tridentate Ru(II) complex having a formula of (1): RuL 1 L 2 (1), wherein Ru is ruthenium, L 1 and L 2 are heterocyclic tridentate ligands; L 1 has a formula of (2): L 2 has a formula of (3): G 1 G 2 G 3 (3), wherein G 1 and G 3 are selected from the group consisting of formulae (4) to (7), and G 2 is selected from the group consisting of formulae (7) and (8); wherein each of R 1 to R 3 in L 1 is a member independently selected from the group consisting of hydrogen, a carboxyl group, a salt of a carboxyl group, a sulfonic acid group, a salt of a sulfonic acid group, a phosphoric acid group and a salt of a phosphoric acid group; and each of R′ and R″ in L 2 is a member independently selected from the group consisting of H, halo, cyano, trifluoromethyl, C 2 -C 10 fluorinated alkyl group, amino, C 1 -C 10 alkyl, C 2 -C 10 alkenyl, C 2 -C 10 alkynyl, C 3 -C 20 cycloalkyl, C 3 -C 20 cycloalkenyl, C 1 -C 20 heterocycloalkyl, C 1 -C 20 heterocycloalkenyl, aryl and heteroaryl.