機械的手法によるYAG:Ce3+蛍光体の合成

Ce3+-doped Y3Al5O12 (Y2.97Al5O12:Ce0.033+, YAG:Ce3+) phosphors have been widely used for white light emitting diodes (LEDs). Here, we report on the effect of Al(OH)3 powder addition on the mechanical synthesis of YAG:Ce3+ phosphor. The YAG:Ce3+ phosphors were synthesized by the mechanical method using an attrition-type mill. When Al(OH)3 was added at 12.5 ‍mass% to the raw powder materials and milled, the synthesis of YAG:Ce3+ phosphor was achieved at the vessel temperature of 438°C. The crystalline, structure, luminescence spectra and internal quantum yield of YAG phosphor were evaluated by X-ray diffraction, scanning electron microscopy, photoluminescence spectroscopy and a quantum yield measurement device, respectively. The synthesized YAG:Ce3+ phosphor revealed the maximum internal quantum yield of 27%.