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Proceedings Article

YAG glass-ceramic phosphor for white LED (I): background and development

[+] Author Affiliations
Shunsuke Fujita, Satoru Yoshihara, Akihiko Sakamoto, Shigeru Yamamoto

Nippon Electric Glass (Japan)

Setsuhisa Tanabe

Kyoto Univ. (Japan)

Proc. SPIE 5941, Fifth International Conference on Solid State Lighting, 594111 (September 14, 2005); doi:10.1117/12.614668
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From Conference Volume 5941

  • Fifth International Conference on Solid State Lighting
  • Ian T. Ferguson; John C. Carrano; Tsunemasa Taguchi; Ian E. Ashdown
  • San Diego, California, USA | July 31, 2005

abstract

We have developed a Ce:YAG (Y3Al5O12) glass-ceramic phosphor for the white LED. The glass-ceramic phosphor was obtained by a heat treatment of a Ce-doped SiO2-Al2O3-Y2O3 mother glass between 1200°C and 1500°C for the prescribed time of period. We confirmed that, by XRD measurements, only YAG crystal precipitated in the mother glass after the heat treatment. It was shown from SEM observation that the YAG crystals with a grain size of approximately 20μm were uniformly dispersed in the glass matrix. The yellow emission, around 540nm in wavelength, was observed from the glass-ceramic phosphor, when it was excited by a blue LED (465nm). The white light due to the mix of yellow and blue light was observed from the glass-ceramic plate with a thickness of 0.5mm. The YAG glass-ceramic phosphor showed a high-temperature resistance and a good performance in a damp heat test. Moreover, a higher thermal conductivity of 2.18 Wm-1K-1 and bending strength of 125MPa were observed compared with a conventional soda-lime glass or an epoxy resin. In addition, since the YAG glass-ceramic phosphor can be formed in a plate-like shape, there is no need to be sealed in resins for the fabrication of the LED devices. Therefore, it is expected that this newly developed glass-ceramic phosphor is a promising candidate for the realization of resin-free, high-temperature and high-humidity resistant, long-life white LED devices.

© (2005) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Shunsuke Fujita ; Satoru Yoshihara ; Akihiko Sakamoto ; Shigeru Yamamoto and Setsuhisa Tanabe
"YAG glass-ceramic phosphor for white LED (I): background and development", Proc. SPIE 5941, Fifth International Conference on Solid State Lighting, 594111 (September 14, 2005); doi:10.1117/12.614668; http://dx.doi.org/10.1117/12.614668


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