| 摘要 |
A fluorescent substance contains M1 (M1 is: barium; barium and strontium; or barium and calcium), europium, magnesium, manganese, and silicon as essential components. The amount of the europium is 0.14 mol or smaller per mol of the silicon, and the amount of the manganese is 0.07 mol or smaller per mol of the silicon. The main crystals are a solid solution of europium and manganese in M13MgSi2O8. When X-ray diffraction intensities for the M13MgSi2O8 crystals, M12MgSi2O7 crystals, M12SiO4 crystals, and M1MgSiO4 crystals are expressed by A, B, C, and D, respectively, then B/(A+B+C+D) is 0.1 or less, C/(A+B+C+D) is 0.1 or less, and D/(A+B+C+D) is 0.26 or less.
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