Multi-grain luminescent ceramics for light emitting devices
AssigneeKoninklijke Philips Electronics N.V.
InventorsRegina B. Mueller-Mach, Gerd O. Mueller, Michael R. Krames, Peter J. Schmidt, Hans-Helmut Bechtel
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Abstract
A ceramic body is disposed in a path of light emitted by a light source. The light source may include a semiconductor structure comprising a light emitting region disposed between an n-type region and a p-type region. The ceramic body includes a plurality of first grains configured to absorb light emitted by the light source and emit light of a different wavelength, and a plurality of second grains. For example, the first grains may be grains of luminescent material and the second grains may be grains of a luminescent material host matrix without activating dopant.
Claims9
1-9. (canceled)
The device of claim 26 wherein:
- the first grains comprise a host matrix and a first activating dopant;
- and
- the second grains comprise the host matrix and a second activating dopant.
The device of claim 26 wherein the second grains are configured to absorb the first light and emit a third light of a different wavelength from the first light and the second light.
The device of claim 26 wherein the ceramic body further comprises third grains comprising the host matrix without any activating dopant.
The device of claim 26 wherein:
- the first activating dopant is Ce;
- and
- the second activating dopant is Eu.
The device of claim 26 wherein the host matrix is Ca1−x−yMyAl1+a−b+xBbSi1−aN3−aOa, where M=(Mg, Sr, Ba), B=(B, Ga), 0.001≦x≦0.02, 0≦y≦1, 0.0005≦a≦1, 0≦b≦1.
The device of claim 26 wherein the host matrix is (Lu1−x−y−a−bYxGdy)3(Al1−z−uGazSiu)5O12−uNu wherein 0≦x≦1, 0≦y≦1, 0<z≦0.1, 0≦u≦0.2, 0<a≦0.2 and 0<b≦0.1.
16-25. (canceled)
A device comprising:
- a light source;
- and
- a ceramic body disposed in a path of a first light emitted by the light source, wherein the ceramic body comprises:
- a plurality of first grains configured to absorb the first light emitted by the light source and emit a second light of a different wavelength from the first light;
- and
- a plurality of second grains;
- wherein the light source comprises a semiconductor structure comprising a light emitting region disposed between an n-type region and a p-type region.
Dependencies are inferred from the claim text.