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US 10,256,427 B2Granted
Efficient organic electroluminescent devices
AssigneeUniversal Display Corporation
InventorsVadim Adamovich, James Esler, Jason Brooks, Michael S. Weaver, Julia J. Brown
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Abstract
An OLED device includes, in order, an electron blocking layer, an organic emissive layer, and a hole blocking layer. Its organic emissive layer contains at least four components: an electron transporting compound, a host, a hole transporting compound, and an emitting compound capable of phosphorescence emission at room temperature. The emitting compound has HOMO energy level of 5.2 eV or lower and a LUMO energy level of 2.5 eV or higher.
Claims20
A device comprising, in order:
- an anode;
- an electron blocking layer;
- an organic light emissive layer;
- a hole blocking layer;
- a cathode;
- wherein the organic light emissive layer comprises a first sub-layer, wherein the first sub-layer includes:
- a host compound;
- a first emitting compound with a HOMO of 5.2 eV or lower and a LUMO of 2.5 eV or higher, the first emitting compound capable of phosphorescence emission at room temperature;
- a hole transporting compound;
- and
- an electron transporting compound;
- wherein less than 5% of the light emitted from the device is comprised of light emitted from the hole transporting compound, light emitted from the electron transporting compound and light emitted from the host.
9 more elements
Dependencies are inferred from the claim text.