Abstract
Here, we report on the effect of mixing state of raw materials on the solid-state synthesis of Ce3+-doped Y3Al5O12 (Y2.97Al5O12:Ce0.033+, YAG:Ce3+) phosphors for white light emitting diodes. The mixed powders were prepared by the mechanical method using an attrition-type mill. Homogeneously mixed powder in nanoscale of raw powder materials was favorably obtained by the mechanical method. It achieved the synthesis of YAG:Ce3+ by heating at 1400°C which was 400°C lower than the synthesis temperature of the mixed powder by ball milling. Besides, larger crystallite size was obtained by heating the powder at higher temperature. The YAG:Ce3+ phosphor synthesized at 1800°C exhibited the largest crystallite size, thus led to maximum external quantum yield of 55%, and the luminous efficiency of 97% at 150°C. It revealed the highest efficiency in the previously reported values.
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