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Novel \hbox {Eu}^{{2+}} -Activated Glass Ceramics Precipitated With Green and Red Phosphors for High-Power White LED

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2 Author(s)
Nakanishi, T. ; Grad. Sch. of Human & Environ. Studies, Kyoto Univ., Kyoto, Japan ; Tanabe, Setsuhisa

We have obtained Eu2+-doped glass-ceramic phosphors, where the two-phosphor crystals of green and red were precipitated by novel GC preparation "frozen sorbet" method and postceraming process. The as-made GC consisted of glass and spherical beta-Ca2SiO4:Eu2+ crystal phases with size of about 20-40 mum. After ceramization, Ca3Si2O7:Eu2+ crystals were also precipitated in addition to the beta-Ca2SiO4 crystal. The photoluminescence had two broad emission bands: at 515 nm from Eu2+ :beta-Ca2SiO4 and at 600 nm from Eu2+ :Ca3Si2O7. Judging from the cathodoluminescence mapping images of microstructure, two emission bands peaked at 515 and 600 nm were observed from different parts in the GC. With increasing heat-treatment temperature, the color coordinates shifted from green range to center region, which corresponds to pure white in the International Commission on Illumination chromaticity diagram. Eu2+-doped calcium silicate GC containing beta-Ca2SiO4 and Ca3Si2O7 are suitable phosphor as the use of phosphor converting white LED with high color rendering.

Published in:

Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:15 ,  Issue: 4 )

Date of Publication:

July-aug. 2009

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