機械的手法によるYAG:Ce³⁺蛍光体の合成

抄録

Ce³⁺-doped Y₃Al₅O₁₂ (Y_2.97Al₅O₁₂:Ce_0.03³⁺, 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%.