Preparation of YAGG:Ce phosphors using nano-sized Al_2O_3 and their photoluminescence properties under VUV excitation

摘要

Ce-doped yttrium aluminum gallium garnet (YAGG:Ce) as a green-emitting phosphor was synthesized by solid state reaction. Its photoluminescence properties under vacuum UV excitation were investigated. The crystalline phase of Al_2O_3 and the use of fluxing agents affected the luminescence characteristics of the YAGG:Ce phosphors. Especially, the nano-sized γ-Al_2O_3 as an Al source increased the emission intensity. Also, the combination of α-Al_2O_3 - BaF_2 and γ-Al_2O_3 - AIF_3 resulted in the improvement of luminance most effectively.