Selective filtering of wavelength-converted semiconductor light emitting devices
AssigneePhilips Lumileds Lighting Company, LLC
InventorsMichael R. Krames, Gerd O. Mueller, Regina B. Mueller-Mach
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Abstract
A structure includes a semiconductor light emitting device including a light emitting layer disposed between an n-type region and a p-type region. The light emitting layer emits first light of a first peak wavelength. A wavelength-converting material that absorbs the first light and emits second light of a second peak wavelength is disposed in the path of the first light. A filter material that transmits a portion of the first light and absorbs or reflects a portion of the first light is disposed over the wavelength-converting material.
Claims16
A structure comprising:
- a semiconductor light emitting device comprising a light emitting layer disposed between an n-type region and a p-type region, the light emitting layer being configured to emit first light having a first peak wavelength;
- at least one wavelength-converting material disposed in a path of the first light, wherein the wavelength-converting material is configured to absorb a first portion of the first light and emit second light having a second peak wavelength;
- and
- a filter material disposed on the at least one wavelength-converting material, wherein the filter material comprises a plurality of dielectric layers, is configured to reflect a second portion of the first light, and is configured to transmit a third portion of the first light.
A method comprising:
- providing a semiconductor light emitting device comprising a light emitting layer disposed between an n-type region and a p-type region, the light emitting layer being configured to emit first light having a first peak wavelength;
- disposing at least one wavelength-converting material in a path of the first light, wherein the wavelength-converting material is configured to absorb a first portion of the first light and emit second light having a second peak wavelength;
- and
- providing a filter material disposed on the at least one wavelength-converting material, wherein the filter material comprises a plurality of dielectric layers, is configured to reflect a second portion of the first light, and is configured to transmit a third portion of the first light.
Dependencies are inferred from the claim text.