BaAl_2S_4：Eu薄膜におけるBa~(2+)とEu~(2+)イオンの局所構造解析

摘要

BaAl_2S_4：Eu薄膜におけるBa~(2+)とEu~(2+)イオンの局所構造解析をXAFS測定によって行った。これに基づいて青色発光の起源に関して理論的考察を行った。%Local structures around Ba~(2+) and Eu~(2+) ions in bright blue luminescent BaAl_2S_4:Eu thin films have been analyzed by X-ray absorption fine structure measurement. Thin films were prepared by two methods: multi-source deposition using molecular beam epitaxy system and electron beam deposition with post-annealing. Investigation of the luminescence from Eu~(2+) ions substituting two different Ba~(2+) sites using simulation based on first principles calculation revealed that the blue luminescence is due to Eu~(2+) ions substituting one of the two sites.