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US 9,425,368 B2Granted
Engineered-phosphor LED packages and related methods
AssigneeCooledge Lighting Inc.
InventorsMichael A. Tischler, Ian Ashdown, Tom Pinnington, Henry Ip
Life of this patent
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Abstract
In accordance with certain embodiments, regions of spatially varying wavelength-conversion particle concentration are formed over light-emitting dies.
Claims34
A light-emitting device comprising:
- a bare light-emitting die having an emission surface;
- a binder disposed over at least a portion of the emission surface;
- and
- disposed within a first portion of the binder, a first plurality of wavelength-conversion particles for absorbing at least a portion of light emitted from the light-emitting die and emitting converted light having a different wavelength, wherein:
- (i) converted light and unconverted light emitted by the light-emitting die combine to form substantially white light,
- (ii) a concentration of the first plurality of wavelength-conversion particles varies in a direction substantially perpendicular to the emission surface to result in a divergence of color temperature of the substantially white light emitted from the binder that varies, over an angular range of 0° to 70°, no more than 0.01 in terms of a Δu′v′ deviation from a spatially weighted averaged chromaticity,
- (iii) u′ and v′ are chromaticity coordinates on a chromaticity diagram, and
- (iv) a second portion of the binder is substantially free of wavelength-conversion particles.
5 more elements
Dependencies are inferred from the claim text.