Ring Remote Phosphor Structure for Phosphor-Converted White LEDs

Author

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

Author_Institution

Electron. & Optoelectron. Res. Labs., Ind. Technol. Res. Inst., Hsinchu, Taiwan

Volume

22

Issue

8

fYear

2010

fDate

4/15/2010 12:00:00 AM

Firstpage

574

Lastpage

576

Abstract

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.

Keywords

electronics packaging; light emitting diodes; phosphors; encapsulant; flat remote phosphor layer; inverted cone lens; luminous efficacy; package extraction efficiency; packaging configuration; phosphor-converted white LED; ray tracing simulations; ring remote phosphor structure; surrounding ring remote phosphor layer; Light-emitting diodes (LEDs); package extraction efficiency; phosphor; solid-sate lighting;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2010.2043088

Filename

5419021