Oxynitride phosphor and a light emitting device
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United States of America Patent
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Jul 22, 2008
Grant Date -
Dec 29, 2005
app pub date -
Mar 22, 2005
filing date -
Mar 22, 2004
priority date (Note) -
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Abstract
A preferred embodiment according to the present invention provides in one preferred mode an oxynitride phosphor especially suitable for a light emitting device such as but not limited to a white light emitting diode lamp and also such a light emitting device. The oxynitride phosphor in the embodiment is represented by a general formula Ca.sub.x(Si,Al).sub.12(O,N).sub.16:Eu.sup.2+.sub.y, wherein a Ca composition of x is in a range of from 0.75 to 1.0 and a Eu composition of y is in a range of from 0.04 to 0.25, and wherein a main phase thereof has substantially an alpha SiAlON crystal structure.
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