Stability oled materials and devices
AssigneeUniversal Display Corporation
InventorsChun LIN, Peter B. MACKENZIE, Robert W. WALTERS, Jui-Yi TSAI, Cory S. BROWN, Jun DENG
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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; and electron transport layer; and a cathode disposed, in that order, over a substrate.
Claims20
A phosphorescent compound, wherein the phosphorescent compound is a neutral metal complex of a monodentate, bidentate, tridentate, tetradentate, pentadentate, or hexadentate ligand;
- wherein the ligand comprises at least one first aryl or heteroaryl ring directly bonded to the metal;
- wherein the first ring is substituted by a second aryl or heteroaryl ring which is not directly bonded to the metal and which is substituted at both ortho positions by groups other than H or halide;
- wherein the first ring is an imidazole, benzene, naphthalene, quinolene, isoquinolene, pyridine, pyrimidine, pyridazine, pyrrole, oxazole, thiazole, oxadiazole, thiadiazole, furan, or thiophene ring;
- 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 greather than 40.
An organic light emitting device comprising:
- an anode;
- a cathode:
- and
- an emissive layer, wherein the emissive layer is located between the anode and the cathode, and the emissive layer comprises a phosphorescent compound, and optionally a host,
- wherein the phosphorescent compound is a neutral metal complex of a monodentate, bidentate, tridentate, tetradentate, pentadentate, or hexadentate ligand;
- wherein the ligand comprises at least one first aryl or heteroaryl ring directly bonded to the metal;
- wherein the first ring is substituted by a second aryl or heteroaryl ring which is not directly bonded to the metal and which is substituted at both ortho positions by groups other than H or halide;
- wherein the first ring is an imidazole, benzene, naphthalene, quinolene, isoquinolene, pyridine, pyrimidine, pyridazine, pyrrole, oxazole, thiazole, oxadiazole, thiadiazole, furan, or thiophene ring;
- 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 greather than 40.
Dependencies are inferred from the claim text.