Design of the Ring Remote Phosphor Structure for Phosphor-Converted White-Light-Emitting Diodes

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Title:	Design of the Ring Remote Phosphor Structure for Phosphor-Converted White-Light-Emitting Diodes
Authors:	Lin,MT;Ying,SP;Lin,MY;Tai,KY;Tai,SC;Liu,CH;Chen,JC;Sun,CC
Contributors:	機械工程學系
Date:	2010
Issue Date:	2012-03-27 17:02:24 (UTC+8)
Publisher:	國立中央大學
Abstract:	A phosphor-converted light-emitting diode structure with an increased phosphor extraction efficiency owing to the ring remote phosphor structure achieves a maximum luminous efficacy of 145 lm/W at 20 mA and a maximum luminous flux of 132 lm at 400 mA. The ring remote phosphor structure consists of an inverted cone lens encapsulant and a surrounding ring remote phosphor layer. Ray-tracing simulations demonstrate that the phosphor extraction efficiency of the ring remote phosphor structure exceeds 93%. A high phosphor extraction efficiency is achieved by decreasing the re-emitting light from the ring remote phosphor layer to the absorptive light-emitting diode (LED) chip. Our results further demonstrate that the ring remote phosphor structure device has a radiation pattern as a bi-wing, which is more appropriate for solid-state lighting owing to the low glare. (C) 2010 The Japan Society of Applied Physics
Relation:	JAPANESE JOURNAL OF APPLIED PHYSICS
Appears in Collections:	[機械工程學系] 期刊論文

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