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METHOD FOR PRODUCING PRECURSOR FOR RARE EARTH-ACTIVATED ALKALINE EARTH METAL FLUORIDE HALIDE-BASED P

2025-06-17 13:171240下载
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PROBLEM TO BE SOLVED : To provide a method for producing photostimulable phosphor imparting an image free from unevenness of luminescence, high in sensitivity and image quality, and to provide a photostimulable phosphor, and a radiation image conversion panel. SOLUTION : The invention relates to the method for producing a precursor for photostimulable phosphor, based on alkaline earth metal fluoride halide activated with rare earth metal, expressed by general formula (1) comprising a process obtaining a crystal of the precursor for the photostimulable phosphor by carrying out a process forming a precipitate of the precursor for photostimulable phosphor based on alkaline earth metal fluoride halide by adding an aqueous solution of an inorganic fluoride into a reaction mother liquid dissolving barium halide and a process concentrating and removing solvent from the reaction mother liquid at the same time, and a process forming a rare earth metal halide layer on the surface of the crystal of the precursor for photostimulable phosphor. The general formula (1); Ba1-xM2xFBryI1-y : aM1, bLn, cO (in the formula, M1 is an alkali metal, M2 is an alkaline earth metal, Ln is a rare earth element, 0≤x≤0.3, 0≤y≤0.3, 0≤a≤0.05. 0
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