Light Emitting Diode Light Source With Layered Phosphor Conversion Coating
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United States of America Patent
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Issued Date -
Nov 15, 2012
app pub date -
May 7, 2012
filing date -
May 9, 2011
priority date (Note) -
Abandoned
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Abstract
The LED (light emitting diode) light source that includes an LED chip or an array of LED chips that emit blue, or UV, violet, or other narrow wavelength light and a phosphor conversion coating that absorbs the radiation from the LED and re-emits lights of longer wavelengths and with wider spectrum of wavelength. The phosphor conversion coating includes a plurality of layered phosphor films wherein adjacent phosphor films are formed of different phosphor materials. A method of forming an LED light source includes soldering LED chip to an electrically insulating substrate and forming a phosphor conversion layer. Forming the phosphor conversion layer includes depositing a number of adjacent phosphor films directly on the surface of the LED chip or on the surface of an optically transparent substrate which may be of curved or flat surface.
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