Development of White Light Emitting Diodes by Multi-layered Red, Green, and Bule Phosphors Excited by Near-ultraviolet Light Emitting Diodes

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概要

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• Cascade excitation process and cascade excitation loss (absorption loss) have been investigated by bilayer (BL-) LEDs. The cascade excitation loss was suppressed by multi-layered (ML-) LED structure, in which red phosphor is placed at the bottom. We have also developed white LEDs by using a ML-structure of red, greed, and blue phosphors for the purpose of reduceing the cascade excitation. Luminous flux of ML-white LEDs showed higher value under low correlation color temperature (CCT=2613K) and high color-rendering index (Ra=94) conditions than conventional phosphor mixed-white LEDs. The angular distribution of chormaticity in the ML-R/G/B white LED was comparable to that in mixed-RGB white LED and was very small.

著者

• FUKUI Takeshi

  Graduate School of Science and Engineering, Yamaguchi University

• SAKUTA Hiroaki

  Graduate School of Science and Engineering, Yamaguchi University

• MISHIRO Kazuya

  Graduate School of Science and Engineering, Yamaguchi University

• MIYACHI Tsutomu

  Graduate School of Science and Engineering, Yamaguchi University

• KAMON Kunihito

  Faculty of Engineering, Yamaguchi University

• HAYASHI Hideki

  Faculty of Engineering, Yamaguchi University

• NAKAMURA Nobutaka

  Choshu Industry CO., LTD

• UCHIDA Yuji

  Faculty of Engineering, Yamaguchi University

• KURAI Satoshi

  Graduate School of Science and Engineering, Yamaguchi University

• TAGUCHI Tsunemasa

  Graduate School of Science and Engineering, Yamaguchi University

• Mishiro Kazuya

  Graduate School Of Science And Engineering Yamaguchi University

• Fukui Takeshi

  Graduate School Of Science And Engineering Yamaguchi University

• Miyachi Tsutomu

  Graduate School Of Science And Engineering Yamaguchi University

• TAGUCHI Takao

  SORTEC Corporation

• Uchida Yuji

  Faculty Of Engineering Yamaguchi University

• Kurai Satoshi

  Science And Engineering Yamaguchi University

• Kurai Satoshi

  Graduate School Of Science And Engineering Yamaguchi University

• Sakuta Hiroaki

  Graduate School Of Science And Engineering Yamaguchi University

• Kamon Kunihito

  Graduate School Of Science And Engineering Yamaguchi University

• Taguchi T

  Department Of Materials Science And Engineering Yamaguchi University

• Kurai Satoshi

  Department Of Electrical And Electronic Engineering Faculty Of Engineering Yamaguchi University

• Kurai Satoshi

  Department Of Electrical And Electronic Engineering Tokushima University

• Taguchi Tsunemasa

  Graduate School Of Science And Engineering Yamaguchi University

• Taguchi Tsunemasa

  Faculty Of Engineering Yamaguchi University

• Nakamura Nobutaka

  Choshu Industry Co. Ltd

• Hayashi Hideki

  Graduate School Of Science And Engineering Yamaguchi University

• Taguchi T

  Department Of Electrical And Electronic Engineering Yamaguchi University

• Taguchi Tsunemasa

  Department Of Materials Science And Engineering Yamaguchi University

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