LED illumination device with layered phosphor pattern
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United States of America Patent
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Jun 22, 2010
Grant Date -
May 29, 2008
app pub date -
Dec 20, 2007
filing date -
Mar 30, 2004
priority date (Note) -
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Abstract
A method of applying at least two phosphors to an LED, wherein a first phosphor material having a lower absorption, shorter luminescence decay time, and/or lower thermal quenching than a second phosphor material is positioned closer to the LED than the second phosphor. Such an arrangement provides a light emitting device with improved lumen output and color stability over a range of drive currents.
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