Ring Remote Phosphor Structure for Phosphor-Converted White LEDs

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

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


An efficient packaging configuration for high-power white light-emitting diodes (LEDs), consisting of an inverted cone lens encapsulant and a surrounding ring remote phosphor layer, is present. Ray-tracing simulations demonstrate that the package extraction efficiency of the ring remote phosphor structure exceeds 93%. With the implementation of the ring remote phosphor structure, the ring remote phosphor device has a maximum luminous efficacy of 145 lm/W at 20 mA and a maximum luminous flux of 132 lm at 400 mA. The enhancements are attributed to reduced absorption of the re-emitting yellow light by the LED chip, and the reduction of the trapping light inside the flat remote phosphor layer in normal remote phosphor structure.

Original languageEnglish
Pages (from-to)574-576
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number8
StatePublished - 15 Apr 2010


  • Light-emitting diodes (LEDs)
  • package extraction efficiency
  • phosphor
  • solid-sate lighting


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