Patent ID: 8269317

Claim:
A compound having a formula: wherein M is a metal having an atomic weight higher than 40; wherein L is an ancillary ligand; wherein m is the oxidation state of the metal M; wherein n is at least 1; wherein A is a fused carbocyclic or fused heterocyclic ring; wherein each of R a and R b may represent mono, di, tri, or tetra substituents; wherein each R a substituent is independently selected from the group consisting of hydrogen, deuterium, alkyl, heteroalkyl, aryl or heteroaryl groups; wherein each R b substituent is independently selected from the group consisting of hydrogen, deuterium, alkyl, heteroalkyl, aryl or heteroaryl groups; and wherein at least two R b substituents are selected from the group consisting of alkoxy, aryloxy, alkyl amino, and aryl amino.