A novel phosphor for glareless white light-emitting diodes

Hisayoshi Daicho (), Takeshi Iwasaki, Kiminori Enomoto, Yasutaka Sasaki, Yuzo Maeno, Yu Shinomiya, Shinobu Aoyagi, Eiji Nishibori, Makoto Sakata, Hiroshi Sawa, Satoru Matsuishi and Hideo Hosono
Additional contact information
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

Nature Communications, 2012, vol. 3, issue 1, 1-8

Abstract: 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.

Date: 2012
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DOI: 10.1038/ncomms2138

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