White light emitting diode light source and method for manufacturing the same
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United States of America Patent
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Issued Date -
Dec 1, 2005
app pub date -
May 28, 2004
filing date -
May 28, 2004
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Abstract
A while light emitting diode light source and method for manufacturing the same are proposed. The while light emitting diode light source has a printed circuit board, and a plurality of LED units on one face of the PCB, each of the LED units comprising a substrate, a blue LED on the substrate and a red-green-yellow phosphor mixture enclosing the blue LED. The red-green-yellow phosphor mixture is a mixture of a red phosphor, a green phosphor and a yellow phosphor. The red phosphor is CaS:Eu or SrS:Eu. The green phosphor is SrGa.sub.2S.sub.4:Eu or Ca.sub.8EuMnMg(SiO.sub.4).sub.4C.sub.12. The yellow phosphor is YAG:Ce or ThAG:Ce. The light emitted from the phosphors are mixed with blue light into white light with a satisfactory color rendering property.
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