PHOSPHOR AND ITS MANUFACTURING METHOD

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PROBLEM TO BE SOLVED : To provide a phosphor finer in particle size than a conventional, rare-earth-activated nitride, oxynitride or sialon phosphor, excellent in powder operability, and high in luminance. SOLUTION : A phosphor powder containing an optically active element (M) as a luminescent center ingredient in the crystal of an inorganic compound that is a nitride, oxynitride or sialon is subjected to washing treatment in a solution containing an acid.