WHITE LIGHT-EMITTING DIODE PACKAGES WITH TUNABLE COLOR TEMPERATURE
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United States of America Patent
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Issued Date -
Feb 17, 2011
app pub date -
Aug 12, 2009
filing date -
Aug 12, 2009
priority date (Note) -
Abandoned
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Abstract
A white light-emitting diode package with tunable color temperature is provided, including a package substrate with a first light emitting diode (first LED) disposed over a first portion of the substrate and a second light emitting diode (second LED) disposed over a second portion different from the first portion of the substrate. A phosphor layer is coated around the first and second LED, wherein the phosphor layer is formed by blending at least one colored phosphor grain with a transparent optical resin, and the at least one colored phosphor grain in the transparent optical resin is excited by light from the first and second LED to react and emit white light. In one embodiment, the first and second LED are both blue LEDs for emitting blue light of different wavelengths or ultraviolet (UV) LEDs for emitting UV light of different wavelengths.
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