FLUORESCENT SUBSTANCE

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PROBLEM TO BE SOLVED : To provide a fluorescent substance capable of being used for a vacuum ultraviolet ray-excited light-emitting element, such as a plasma display panel and a rare gas lamp, an ultraviolet ray-excited light-emitting element, such as a liquid crystal backlight, a white LED (light emitting diode), and a fluorescent lamp, an electron beam-excited light-emitting element, such as a Braun tube, and an X ray-excited light-emitting element, such as an X-ray image device, and capable of exhibiting a high luminance. SOLUTION : This fluorescent substance contains both a first activator and a second activator, wherein the first activator comprises one or more kinds selected from the group consisting of Eu and Mn, and the second activator comprises Ln (Ln is one or more kinds selected from the group consisting of rare earth metal elements of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Tb, Dy, Ho, Er, Tm, Yb and Lu). A parent material of the fluorescent substance comprises a compound expressed by the formula : mM1O-nM2O-2M3O2 (M1 comprises one or more kinds selected from the group consisting of Ca, Sr and Ba; M2 comprises one or more kinds selected from the group consisting of Mg and Zn; M3 comprises one or more kinds selected from the group consisting of Si and Ge; and (m) and (n) satisfy following inequalities : 0.5≤m≤3.5 and 0.5≤n≤2.5).