Color-converting light emitting device including fluorescent powder having large grain diameter, method of producing the same, and resin composition used therein
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United States of America Patent
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Issued Date -
Dec 29, 2005
app pub date -
Oct 1, 2004
filing date -
Jun 28, 2004
priority date (Note) -
Abandoned
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Abstract
Disclosed is a color-converting light emitting device, which includes a light emitting element for emitting light with a predetermined wavelength and a color-converting member for absorbing a portion of light emitted from the light emitting element to convert the wavelength of the light into another wavelength. The present invention provides the color-converting light emitting device, which includes a gallium nitride-based light emitting diode having an emission spectrum at a visible ray region, and a color-converting member absorbing light from the diode to convert the wavelength of the light into another wavelength. The color-converting member includes a transparent resin and a garnet-based fluorescent powder dispersed in the transparent resin, and the fluorescent powder has a grain size distribution in which a minimum grain diameter is 10 .mu.m or more and a mean grain diameter (d.sub.50) is 20 .mu.m or more.
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