Visible light source with UV reflector

A light source 200 capable of producing white light comprises a semiconductor radiation source 208, a thin film of phosphor 222 deposited over the surface of the radiation source 208, and a UV reflector 224. The radiation source 208 is preferably an ultraviolet ("UV") light emitting diode...

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Bibliographic Details
Main Authors JANET BEE YIN CHUA, THYE LINN MOK, WOOI KIN GOON, YUE HOONG LAU, KEE YEAN NG, RENE P HELBING, GIM ENG CHEW
Format Patent
LanguageEnglish
Published 21.03.2007
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
SEMICONDUCTOR DEVICES
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Summary:A light source 200 capable of producing white light comprises a semiconductor radiation source 208, a thin film of phosphor 222 deposited over the surface of the radiation source 208, and a UV reflector 224. The radiation source 208 is preferably an ultraviolet ("UV") light emitting diode ("LED") that emits near-violet or ultraviolet light. The thin film of phosphor 222 absorbs UV radiation emitted by the source 208 and converts it to white light. The UV reflector 224 is optically coupled to the thin phosphor layer 222 so as to reflect UV radiation back to the phosphor layer while allowing visible light to pass through. Thus UV radiation is converted to visible light more effectively, and harmful UV radiation is prevented from being emitted from the source 200.
Bibliography:Application Number: GB20060016653