Multi-grain luminescent ceramics for light emitting devices
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United States of America Patent
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Mar 8, 2011
Grant Date -
Jun 26, 2008
app pub date -
Dec 22, 2006
filing date -
Dec 22, 2006
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Expired
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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.
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