Patent ID: 7011897

Claim:
An emissive material represented by the structure: wherein M is a heavy metal with an atomic weight of greater than or equal to 40; R 3 is a substituent having a Hammett value greater than 0.6; each of R 2 , R 4 , R 5 , and R′ 3 through R′ 6 are independently selected from the group consisting of H, halogens, CN, perfluoroalkyl, trifluorovinyl, NO 2 , CO 2 R, C(O)R, S(O)R, SO 2 R, SO 3 R, P(O)R, PO 2 R, PO 3 R, C≡CR, alkyl, alkenyl, aryl, heteroaryl, OR, SR, NR 2 (including cyclic-amino), and PR 2 (including cyclic-phosphino), where R is hydrogen, an alkyl group, an aryl group or a heteroaryl group; m is an integer between 1 and 4 and n is an integer between 1 and 3; and, is a monoanionic non carbon coordinating ligand.