Patent ID: 7582365

Claim:
An organic light emitting device, comprising: an anode; a cathode; and at least one organic layer disposed between the anode and the cathode; the organic layer comprising a reversibly reducible metal complex of a redox active metal center and at least one ligand; wherein in a reduced state, an extra electron is localized on the metal center, and wherein the metal complex is of Formula I wherein M is a redox active transition metal, E 1 and E 3 are independently selected from nitrogen, oxygen, and sulfur mono-anionic donors; E 2 is a C, N, P, or Si neutral donor; (X—Y) is selected from a photoactive ligand or an ancillary ligand; m is a value from 1 to the maximum number of ligands that may be attached to metal M; and m+n is the maximum number of ligands that may be attached to metal M, such that the overall complex is neutral.