Abstract
Glass ceramics containing Ce3+ doped garnet microcrystals were prepared from the spontaneous crystallization of SiO2-Al2O3-Y2O3-MgO-BaO-CeF3 glass melt. The formation of Ce3+:(Y,Mg)3(Al,Si)5O12 grains in the glass matrix were investigated by X-ray diffraction, scanning electron microscope and photoluminescence spectra. The transmittance of samples improves with higher melting temperature or increasing BaO/MgO ratio, while the Ce3+: 5d → 4f emission intensity weakens monotonously. Besides, the transmittance declines sharply after being heat treated above 950°C, which is originated from the schistose BaAl2Si2O8 microcrystals in the glass matrix. The optimized sample with composition of 40SiO2-16Al2O3-8Y2O3-24BaO-12MgO-0.3CeF3 was chosen to construct a white LED device, which yields bright white light with luminous efficiency of 23.6 lm/W, correlated color temperature of 5260 K and Ra of 85.5. It indicates that the investigated glass ceramics can be a promising color converter for white LEDs.
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