Phosphor and light-emitting device using same
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United States of America Patent
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Sep 1, 2015
Grant Date -
Sep 19, 2013
app pub date -
Mar 28, 2013
filing date -
Sep 28, 2010
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Abstract
Provided is a phosphor having enhanced luminance with respect to that of conventional β-type sialon phosphors. A phosphor having enhanced luminance is obtained by causing Al, O (oxygen) and Eu to be present at specific concentrations in a produced β-type sialon phosphor. Specifically, provided is a β-type sialon phosphor containing Si, Al, O, N and Eu, wherein the Al concentration in the phosphor ranges from 0.80 mass % or higher to 2.25 mass % or lower, the O concentration ranges from 0.36 mass % or higher to 1.15 mass % or lower, the Eu concentration ranges from 0.40 mass % or higher to 0.80 mass % or lower and a ratio (Al/O) of the Al concentration with respect to the O concentration ranges from 2.0 or higher to 3.0 or lower.
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