×

Stability OLED materials and devices

  • US 9,051,344 B2
  • Filed: 10/04/2005
  • Issued: 06/09/2015
  • Est. Priority Date: 05/06/2005
  • Status: Active Grant
First Claim
Patent Images

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.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×