Phosphor converted light emitting device
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United States of America Patent
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Apr 6, 2004
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N/A
app pub date -
Oct 14, 2002
filing date -
Oct 14, 2002
priority date (Note) -
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Abstract
A device includes a semiconductor light emitting device and a wavelength-converting material comprising Sr--SiON:Eu.sup.2+. The Sr--SiON:Eu.sup.2+ wavelength-converting material absorbs light emitted by the light emitting device and emits light of a longer wavelength. The Sr--SiON:Eu.sup.2+ wavelength-converting material may be combined with other wavelength-converting materials to make white light. In some embodiments, the Sr--SiON:Eu.sup.2+ wavelength-converting layer is combined with a red-emitting wavelength-converting layer and a blue light emitting device to generate emission in colors, which are not achievable by only mixing primary and secondary wavelengths. In some embodiments, the Sr--SiON:Eu.sup.2+ wavelength-converting layer is combined with a red-emitting wavelength-converting layer, a blue-emitting wavelength-converting layer, and a UV light emitting device.
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