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A novel phosphor for glareless white light-emitting diodes

Author

Listed:
  • Hisayoshi Daicho

    (Koito Manufacturing Co., Ltd)

  • Takeshi Iwasaki

    (Koito Manufacturing Co., Ltd)

  • Kiminori Enomoto

    (Koito Manufacturing Co., Ltd)

  • Yasutaka Sasaki

    (Koito Manufacturing Co., Ltd)

  • Yuzo Maeno

    (Koito Manufacturing Co., Ltd)

  • Yu Shinomiya

    (Koito Manufacturing Co., Ltd)

  • Shinobu Aoyagi

    (Nagoya City University)

  • Eiji Nishibori

    (Nagoya University)

  • Makoto Sakata

    (SPring-8/JASRI, Kouto, Sayo, Hyogo 679-5198, Japan.)

  • Hiroshi Sawa

    (Nagoya University)

  • Satoru Matsuishi

    (Frontier Collaborative Research Center, Tokyo Institute of Technology)

  • Hideo Hosono

    (Frontier Collaborative Research Center, Tokyo Institute of Technology)

Abstract

The luminous efficiency of white light-emitting diodes, which are used as light sources for next-generation illumination, is continuously improving. Presently available white light-emitting diodes emit with extremely high luminance because their emission areas are much smaller than those of conventional light sources. Consequently, white light-emitting diodes produce a glare that is uncomfortable to the human eye. Here we report a yellow-emitting phosphor, the Eu2+-doped chlorometasilicate (Ca1-x-y,Srx,Euy)7(SiO3)6Cl2, which can be used to create glareless white light-emitting diodes. The (Ca1-x-y,Srx,Euy)7(SiO3)6Cl2 exhibits a large Stokes shift, efficiently converting violet excitation light to yellow luminescence, and phosphors based on this host material have much less blue absorption than other phosphors. We used crystal structure analysis to determine the origin of the desired luminescence, and we used (Ca1-x-y,Srx,Euy)7(SiO3)6Cl2 and a blue-emitting phosphor in combination with a violet chip to fabricate glareless white light-emitting diodes that have large emission areas and are suitable for general illumination.

Suggested Citation

  • Hisayoshi Daicho & Takeshi Iwasaki & Kiminori Enomoto & Yasutaka Sasaki & Yuzo Maeno & Yu Shinomiya & Shinobu Aoyagi & Eiji Nishibori & Makoto Sakata & Hiroshi Sawa & Satoru Matsuishi & Hideo Hosono, 2012. "A novel phosphor for glareless white light-emitting diodes," Nature Communications, Nature, vol. 3(1), pages 1-8, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms2138
    DOI: 10.1038/ncomms2138
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