INFRARED-TO-VISIBLE CONVERSION PHOSPHOR

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PROBLEM TO BE SOLVED : To provide a small particle rare earth oxide sulfide phosphor having high infrared conversion efficiency. SOLUTION : The phosphor is expressed by the general formula : (Ln1-x-yYbxEry)2O2S (wherein Ln expresses at least one element selected from Y, Gd and La; x satisfies 0.02≤x≤0.2; y satisfies 0.02≤y≤0.2) and contains 0.001-0.5 wt.% boron B.