Abstract
Ce-doped YAG phosphor powders were prepared by co-precipitation and heterogeneous precipitation methods using ammonium hydrogen carbonate as precipitant. Pure Ce-doped YAG phase was obtained by calcining the precipitate at 1200 °C. The emission intensity of Ce-doped YAG phosphor was found to increase with increases in the calcining temperature, and there was a clear shift of peaks to longer wavelengths. The emission intensity of two samples was compared. It was found that, calcining below 1340 °C, the emission intensity of sample prepared by co-precipitation was higher, on the other hand, calcining above 1340 °C, the emission intensity of sample prepared by heterogeneous precipitation was higher.
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