YELLOW PHOSPHOR AND WHITE LIGHT EMITTING DEVICE USING THE SAME
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United States of America Patent
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app pub date -
Feb 4, 2008
filing date -
Aug 5, 2005
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Abstract
Yellow phosphors which are excited by a blue light source and have a high luminescence efficiency are disclosed. Also disclosed is a method of synthesizing yellow phosphors which provides superior luminance and color purity. Also disclosed is a white light emitting device comprising the yellow phosphors which has a wide range for reproducing white colors so that a white light similar to a natural color may be obtained. One aspect of the present invention may provide a yellow phosphor represented by the following formula 1: (Gd.sub.1-xTb.sub.x).sub.3(Ga.sub.1-yQ.sub.y).sub.2Al.sub.3O.sub.z:aCe.sup-.3+,bB.sup.3+ (1) wherein Q is one or more elements selected from a group consisting of Si, Al, and Se; 0.ltoreq.x.ltoreq.0.1; 0.ltoreq.y.ltoreq.0.5; z is 12 when y is 0, 12 when Q is one or more elements selected from a group consisting of Al and Sc, or 12+y when Q is Si; a is 1 to 10 mole % of (Gd, Tb); and b is 0.5 to 4 moles per 1 mole of the host medium composition.
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