Preparation and Performance of Ce:YAG Phosphor-in-glass

doi:10.15541/jim20140570

Abstract

Abstract:

One-step spark plasma sintering (SPS) process was introduced to fabricate Ce:YAG phosphor-in-silica-glass (PiSG), of which the composite powder of glass powder/commercial Ce:YAG phosphor was directly obtained by ball mill grinding. The phase, microstructures, absorption spectrum and photoluminescence properties of PiSG samples were investigated by XRD, SEM, UV-Vis spectrophotometer, fluorescence spectrophotometer, etc. The results showed that the as-sintered PiSG sample had amorphous phase and the Ce:YAG phosphor particles was uniformly distributed in glass matrix with no size change, indicating that Ce:YAG phosphor particles were well preserved in silica glass matrix without any decomposition reaction. There was a strong absorption peak around 460 nm and a broad emission band peaked at 530 nm of PiSG sample. The properties of PiSG samples were studied by adjusting the phosphor concentration, demonstrating that the photoluminescence intensity reached the highest when Ce:YAG phosphor concentration was 3wt%. Besides, the optimized 3wt% PiSG based LED modules fell into white light range(0.33, 0.38) under 800 mA current drive.

Key words: white LED, Ce:YAG, phosphor-in-glass, spark plasma sintering

CLC Number:

TQ174

ZHANG Yan, LIU Sheng, XU Hong-Jie, WANG Lian-Jun, JIANG Wan. Preparation and Performance of Ce:YAG Phosphor-in-glass[J]. Journal of Inorganic Materials, 2015, 30(6): 588-592.

Figures/Tables 5

Fig. 1 (a) Size distribution and (b) median particle diameter of the SiO2 powders milled for different time

Fig. 2 Pictures of (a) as-sintered quartz glass samples sintered at different temperatures and (b) PiSG samples with different phosphor concentrations (c) XRD patterns of quartz glass samples sintered at different temperatures

Fig. 3 (a) XRD patterns of the PiSG sample and commercial Ce:YAG phosphor and (b) optical micrograph of the 3wt% PiSG sample. Inset is the optical micrograph of Ce:YAG phosphor

Fig. 4 Optical transmittance (a) and photoluminescence spectra (b) of PiSG sample with various phosphor concentrations

Fig. 5 Chromaticity color coordinates of the white LED modules employing 3wt% PiSG sample

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