Multi-grain luminescent ceramics for light emitting devices
AssigneesKoninklijke Philips Electronics N.V., Philips Lumileds Lighting Company, LLC
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.
Claims18
A device comprising:
- a light source;
- and
- a ceramic body disposed in a path of light emitted by the light source, wherein the ceramic body comprises:
- a plurality of first grains, each of the first grains comprising a host matrix and an activating dopant configured to absorb first light emitted by the light source and emit second light of a different wavelength from the first light;
- a plurality of second grains, each of the second grains comprising the host matrix without any activating dopant,
- wherein the first and second grains have a grain size between 0.2 μm and 20 μm, and each of the first grains is surrounded by a ceramic matrix of the second grains.
Dependencies are inferred from the claim text.