VACUUM ULTRAVIOLET-EXCITED PHOSPHOR, LIGHT-EMITTING ELEMENT, AND LIGHT EMITTING DEVICE

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PROBLEM TO BE SOLVED : To provide a mercury-free, vacuum ultraviolet-excited phosphor that exhibits deep ultraviolet light by irradiation with vacuum ultraviolet rays. SOLUTION : A vacuum ultraviolet-excited phosphor has : rare earth elements including at least yttrium elements; praseodymium elements; aluminum elements; and oxygen elements, where the molar ratio (x) of the praseodymium elements is 0

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