Methods and devices using high efficiency alkaline earth metal thiogallate-based phosphors
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United States of America Patent
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May 6, 2008
Grant Date -
Oct 21, 2004
app pub date -
Apr 13, 2004
filing date -
Apr 21, 2003
priority date (Note) -
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Abstract
The present invention provides a light emitting device comprising: a light output; a light source that produces light having a wavelengths of 530 nm or less; and a wavelength transformer located between the light source and the light output, where the wavelength transformer comprises Sr.sub.1-xCa.sub.xGa.sub.2S.sub.4: yEu.sup.2+zGa.sub.2S.sub.3, where x is 0.0001 to 1, y is a value defining sufficient Eu.sup.2+ to provide luminescent emission, and z is 0.0001 to 0.2 based on the mole amount of Sr.sub.xCa.sub.1-xGa.sub.2S.sub.4, and where the wavelength transformer effectively increases the light at the light output, the light having a wavelength between 535 nm and 560 nm.
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