Yellow Emitting Phosphor And White Semiconductor Light Emitting Device Incorporating The Same
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United States of America Patent
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Issued Date -
Jan 24, 2008
app pub date -
Dec 30, 2003
filing date -
Dec 23, 2003
priority date (Note) -
Abandoned
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Abstract
The present invention relates to a yellow phosphor represented by a general formula of A(.sub.1-y).sub.3D.sub.5-x E.sub.x O.sub.12:Ce.sub.y (wherein: A is at least one element selected from the group consisting of Y, Lu, Sc, La, Gd and Sm; D is at least one element selected from the group consisting of Al, Ga and In; E is at least one element selected from the group consisting of B and Fe; 0.ltoreq.x<0.5; and 0.0001.ltoreq.y<0.5), and a white semiconductor light emitting device incorporating the same. The white semiconductor light emitting device comprises a semiconductor light emitting diode, and a phosphor coating layer. The phosphor coating layer comprises yellow phosphor and optionally zinc selenium-based red phosphor that absorb a portion of light emitted by the semiconductor light emitting diode and emits light of wavelength different from that of the absorbed light and a transparent resin. The white semiconductor light emitting device has excellent color rendering and experiences only extremely low degrees of deterioration in emission efficiency in a long period of service.
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