Patent ID: 8030490

Claim:
A phosphorescent tris-chelated iridium metal complex comprising two identical non-conjugated cyclometalated ligands being incorporated into a coordination sphere thereof with iridium metal, and one ligated chromophore being incorporated into the coordination sphere, and the ligated chromophore possesses a relatively lower energy gap in comparison with that of the non-conjugated cyclometalated ligand, the latter afforded an effective barrier for inhibiting the ligand-to-ligand charge transfer process, so that a subsequent radiative decay from an excited state of these transition metal complexes will be confined to the ligated chromophore. wherein the complex is represented by the following formula la and its stereo isomers: wherein the non-conjugated cyclometalated ligands are represented by C and N linked with an arch, and has a formula of and n is an integer of 1-3, the ligated chromophore is presented by the L and X linked with an arch, and has a formula of wherein Ph is phenyl.