A phosphor improved against luminance deterioration with time under vacuum ultraviolet irradiation, a phosphor paste composition, and a vacuum ultraviolet excitation light emitting element high in luminance retaining rate and improved in luminance, are presented. An alkaline earth al
An aluminate phosphor activated with Eu or coactivated with Eu and Mn, which contains sulfur; a process for its production; a phosphor paste composition; and a vacuum ultraviolet ray excitation type light-emitting device having a fluorescent layer made of such a phosphor.
