Fluorescent substance

特許 権利維持 PROBLEM TO BE SOLVED: To provide a new production method of a fluorescent substance for inorganic EL (electroluminescence), capable of producing high luminance Eu-doped BaAl<SB>2</SB>S<SB>4</SB>sulfate fluorescent substance, suppressing the noxious gas generation during pulverization and mixing of sulfide such as aluminum sulfate, and using no noxious gas such as hydrogen sulfide in synthesizing.