Coated LED with improved efficiency

An LED device including an LED chip and a lens positioned apart from the chip and coated with a uniform thickness layer of fluorescent phosphor for converting at least some of the radiation emitted by the chip into visible light. Positioning the phosphor layer away from the LED improves the efficien...

Full description

Saved in:
Bibliographic Details
Main Authors Soules, Thomas F, Weaver, Jr, Stanton, Chen, Chen-Lun Hsing, Sommers, Mathew, Kolodin, Boris, Setlur, Anan Achyut, Stecher, Thomas Elliot
Format Patent
LanguageEnglish
Published 20.01.2009
Online AccessGet full text

Cover

More Information
Summary:An LED device including an LED chip and a lens positioned apart from the chip and coated with a uniform thickness layer of fluorescent phosphor for converting at least some of the radiation emitted by the chip into visible light. Positioning the phosphor layer away from the LED improves the efficiency of the device and produces more consistent color rendition. The surface area of the lens is preferably at least ten times the surface area of the LED chip. For increased efficiency, the reflector and submount can also be coated with phosphor to further reduce internal absorption.