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PROBLEM TO BE SOLVED : To provide an ultraviolet phosphor that has extremely high luminous efficiency by vacuum ultraviolet ray excitation. SOLUTION : The ultraviolet phosphor for ultraviolet phosphorescent lamp that uses vacuum ultraviolet rays as an excitation source is represented by the composition formula : M3Y2-x-yCexLnySi6O18 (wherein M is at least one of divalent ion selected from Ca, Sr, Ba and Pb; Ln is at least one of trivalent ion selected from rare earth elements other than Ce; 0
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