Patent ID: 8592585

Claim:
A phosphorescent tris-chelated iridium metal complex comprising one non-conjugated cyclometalated ligand forming a coordination sphere thereof with iridium, and two ligated chromophores being incorporated into the coordination sphere, wherein the ligated chromophores possess 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 the phosphorescent tris-chelated iridium metal complex will be confined to the ligated chromophores, wherein the complex is represented by the following formula IIb and its stereo isomers: wherein the non-conjugated cyclometalated ligand is represented by P and C linked with an arch, and has a formula of Ar 5 —C(R 1 R 2 )—P(Ar 6 Ar 7 ), wherein Ar 5 , Ar 6 and Ar 7 independently are an identical carbocyclic aromatic ring or different carbocyclic aromatic rings; R 1 and R 2 independently are H or methyl; and C in the formula IIb is a carbon atom contained in Ar 5 , wherein the ligated chromophore is represented by the L and X linked with an arch, and has formula of Ar 3 —Ar 4 , wherein Ar 3 and Ar 4 independently are an aromatic ring or N-heterocyclic ring, or Ar 3 —Ar 4 together are and wherein L is N or O, and X is C, N or O.