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US 2012/0217865 A1Published application
Solid state light emitting devices including nonhomogeneous luminophoric particle size layers
AssigneeCree, Inc.
InventorsJasper Cabalu, Michael John Bergmann
Life of this patent
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Abstract
A light emitting device includes an LED and a layer of luminophoric particles, such as phosphor, that are non-homogeneous in size as a function of distance away from the LED. For example, a first layer of relatively large size phosphor particles may be provided between a second layer of relatively small size phosphor particles and the LED. The large particles can provide high brightness and the small particles can reduce angular color temperature variation in emitted light.
Claims20
A light emitting device comprising:
- a solid state light emitting source;
- a first layer comprising luminophoric particles;
- and
- a second layer comprising luminophoric particles having an equivalent particle diameter that is smaller than that of the first layer, wherein the first layer is between the second layer and the solid state light emitting source.
1 more element
A light emitting device comprising:
- a solid state light emitting source;
- and
- a layer comprising luminophoric particles having an equivalent particle diameter that decreases with increasing distance away from the solid state light emitting source.
A light emitting device comprising:
- a solid state light emitting source;
- and
- a layer comprising luminophoric particles having light conversion efficiency that decreases with increasing distance away from the solid state light emitting source and having light scattering efficiency that increases with increasing distance away from the solid state light emitting source.
A light emitting device comprising:
- a solid state light emitting source;
- and
- a layer comprising luminophoric particles that are non-homogeneous in size as a function of distance away from the solid state light emitting source.
Dependencies are inferred from the claim text.