Light emitting device comprising phosphorescent materials for white light generation
AssigneeUniversal Display Corporation
InventorsMark E. Thompson, P. Daniel Dapkus
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Abstract
The present invention relates to phosphors for energy downconversion of high energy light to generate a broadband light spectrum, which emit light of different emission wavelengths.
Claims25
A white light emitting device comprising an emissive layer having a thickness of from about 100 microns to about 1000 microns, wherein the emissive layer comprises a phosphorescent phosphor for energy downconversion to generate a broadband light spectrum, wherein the phosphor absorbs light at a first wavelength λ1 of radiation, and emits light of different emission wavelengths having lower energies than the first wavelength λ1.
A white light emitting device comprising an emissive layer, wherein the emissive layer comprises a phosphorescent phosphor for energy downconversion to generate a broadband light spectrum, wherein the phosphor absorbs light at a first wavelength λ1 of radiation, and emits light of different emission wavelengths having lower energies than the first wavelength λ1, wherein the phosphor comprises a single phosphor that emits simultaneously from molecular and aggregate states.
A white light emitting device comprising an emissive layer, wherein the emissive layer comprises a phosphorescent phosphor for energy downconversion to generate a broadband light spectrum, wherein the phosphor absorbs light at a first wavelength λ1 of radiation, and emits light of different emission wavelengths having lower energies than the first wavelength λ1, wherein the phosphor does not absorb the emitted light by the phosphor.
A white light emitting device comprising an emissive layer, wherein the emissive layer comprises a phosphorescent phosphor for energy downconversion to generate a broadband light spectrum, wherein the phosphor absorbs light at a first wavelength λ1 of radiation, and emits light of different emission wavelengths having lower energies than the first wavelength λ1, wherein the phosphor is dispersed at the molecular level in a solid, crystalline or microcrystalline matrix, and further wherein the phosphor is present at a concentration of less than 0.1 weight percent based on the total weight of the matrix.
A white light emitting device comprising an emissive layer, wherein the emissive layer comprises a phosphorescent phosphor for energy downconversion to generate a broadband light spectrum, wherein the phosphor absorbs light at a first wavelength λ1 of radiation, and emits light of different emission wavelengths having lower energies than the first wavelength λ1, wherein the phosphor comprises a phosphorescent organometallic copper complex.
A white light emitting device comprising an emissive layer having a thickness of from about 100 microns to about 1000 microns, wherein the emissive layer comprises a phosphorescent phosphor for energy downconversion to generate a broadband light spectrum, wherein the phosphor absorbs light at a first wavelength λ1 of radiation from an excitation source in the blue, violet, or ultra violet region, and emits light of different emission wavelengths having lower energies than the first wavelength λ1;
- wherein the phosphorescent comprises a copper complex, iridium compound or mixtures thereof.
A method of generating white light comprising:
- providing an excitation source;
- providing a molecular phosphorescent phosphor for absorbing a UV light source at a first wavelength λ1 of radiation;
- and
- emitting light of different emission wavelengths having lower energies than the first wavelength λ1;
- wherein the phosphor does not absorb the emitted light by the phosphor.
Dependencies are inferred from the claim text.