Design of the ring remote phosphor structure for phosphor-converted white-light-emitting diodes

Ming Te Lin, Shang Ping Ying, Ming Yao Lin, Kuang Yu Tai, Sheng Chieh Tai, Chih Hsuan Liu, Jyh Chen Chen, Ching Cherng Sun

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

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 20mA 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.

Original languageEnglish
Pages (from-to)721011-721016
Number of pages6
JournalJapanese Journal of Applied Physics
Volume49
Issue number7 PART 1
DOIs
StatePublished - Jul 2010

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