Phosphorescence-sensitized delayed fluorescence light emitting system
AssigneeUniversal Display Corporation
InventorsWoo-Young So, Jui-Yi Tsai, Chuanjun Xia
Life of this patent
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Abstract
Disclosed is a device that includes an emissive material or region including a host that is doped with a first material as an emitter that is an acceptor and a phosphorescent-capable second material as a sensitizer. The first material and the second material each has a first singlet state and a first triplet state. The first triplet state of the second material is not lower than the first triplet state of the first material. The second material transfers excitons to the first material and the excitons that transition to the first triplet state of the first material can be activated to the first singlet state of the first material through a thermal activation process.
Claims20
A device comprising:
- an emissive layer, said emissive layer comprising:
- a host material doped with a first material as an emitter that is an acceptor and a phosphorescent-capable second material as a sensitizer;
- wherein the first material and the second material each has a first singlet state and a first triplet state;
- wherein the first triplet state of the second material is not lower than the first triplet state of the first material;
- wherein, in operational state at room temperature, the second material transfers excitons to the first singlet state and the triplet state of the first material;
- and
- wherein the excitons that are transferred to the first triplet state of the first material are activated to the first singlet state of the first material through a thermal activation process.
An emissive layer in a device, said emissive layer comprising:
- a host material doped with a first material as an emitter that is an acceptor and a phosphorescent-capable second material as a sensitizer;
- wherein the first material and the second material each has a first singlet state and a first triplet state;
- wherein the first triplet state of the second material is not lower than the first triplet state of the first material;
- wherein, in operational state at room temperature, the second material transfers excitons to the first singlet state and the first triplet state of the first material;
- and
- wherein the excitons that are transferred to the first triplet state of the first material are activated to the first singlet state of the first material through a thermal activation process.
A consumer product comprising a device that comprises an emissive layer, said emissive layer comprising:
- a host material doped with a first material as an emitter that is an acceptor and a phosphorescent-capable second material as a sensitizer;
- wherein the first material and the second material each has a first singlet state and a first triplet state;
- wherein the first triplet state of the second material is not lower than the first triplet state of the first material;
- wherein, in operational state at room temperature, the second material transfers excitons to the first singlet state and the first triplet state of the first material;
- and
- wherein the excitons that are transferred to the first triplet state of the first material are activated to the first singlet state of the first material through a thermal activation process.
Dependencies are inferred from the claim text.