Patent ID: 9051344
Filing Date: 2015-06-09
Classification: C07F,C09K,H01L

Abstract:
1. A phosphorescent compound, wherein the phosphorescent compound is a neutral metal complex of a bidentate, tridentate, tetradentate, pentadentate, or hexadentate ligand; wherein the ligand comprises: a first ring directly bonded to the metal, the first ring being an imidazole; a second ring as a substitution on the first ring and not directly bonded to the metal, the second ring being an aryl or heteroaryl ring substituted at both ortho positions by groups other than H or halide, wherein the ortho position substitutions do not form a fused ring with the second ring; a third ring as a substitution on the first ring, the third ring being an aryl or heteroaryl ring directly bonded to the metal; wherein the metal complex is an organometallic complex; wherein the metal is selected from the group consisting of the non-radioactive metals with atomic numbers greater than 40; and wherein the photoluminescent emission spectrum of the phosphorescent compound is blue-shifted compared to a comparative compound of identical structure except without the ortho position substitutions on the second ring.