Stability OLED materials and devices
First Claim
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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 at least one first imidazole ring directly bonded to the metal;
wherein the first imidazole ring is substituted by a second aryl or heteroaryl ring that is not directly bonded to the metal, the second ring being substituted at both ortho positions by substituents independently selected from the group consisting of aryl or heteroaryl groups;
wherein the metal complex is an organometallic complex; and
wherein the metal is selected from the group consisting of the non-radioactive metals with atomic numbers greater than 40.
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Abstract
Organic light emitting materials and devices comprising phosphorescent metal complexes comprising ligands comprising aryl or heteroaryl groups substituted at both ortho positions are described. An organic light emitting device, comprising: an anode; a hole transport layer; an organic emissive layer comprising an emissive layer host and an emissive dopant; an electron impeding layer; an electron transport layer; and a cathode disposed, in that order, over a substrate.
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Citations
21 Claims
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1. A phosphorescent compound, wherein the phosphorescent compound is a neutral metal complex of a bidentate, tridentate, tetradentate, pentadentate, or hexadentate ligand;
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wherein the ligand comprises at least one first imidazole ring directly bonded to the metal; wherein the first imidazole ring is substituted by a second aryl or heteroaryl ring that is not directly bonded to the metal, the second ring being substituted at both ortho positions by substituents independently selected from the group consisting of aryl or heteroaryl groups; wherein the metal complex is an organometallic complex; and wherein the metal is selected from the group consisting of the non-radioactive metals with atomic numbers greater than 40. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification