チタンをドープしたNa4Sn3O8の蛍光とフォトクロミズム--材料分析室利用研究成果、そのXXVIII(7)--チタンをドープしたNa4Sn3O8の蛍光とフォトクロミズム--材料分析室利用研究成果、そのXXVIII(7)--AA12669200 Photoluminescence and Photochromism in Ti-doped Na4Sn3O8--Research works accomplished by using materials analysis facilities: XXVIII(7)--
Many researches for stannate phosphors have been reported in which Ti4+ ions are doped as fluorescent ions. In this study, we attempted to synthesize a new phosphor based on Na4Sn3O8, which was found recently, as a host crystal and Ti4+ ions as fluorescent ions. It was revealed that the host crystal Na4Sn3O8 itself, which does not contain Ti4+, exhibits fluorescence under irradiation with ultraviolet light, and that Ti4+-doped Na4Sn3O8 shows different fluorescence from the host crystal. A phenomenon in which the emission intensity declined after ultraviolet irradiation for a long period of time was observed in all the samples, and coloration of the sample was observed simultaneously. We propose the generation of optical absorption sites by ultraviolet irradiation as a mechanism for the decline of emission intensity and the coloration.