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We report the photoluminescence, X-ray luminescence and scintillation properties of CaF2:Sm2+. Large single crystals of CaF2:Sm2+ were grown by simply slow cooling of the calcium fluorite melt doped with samarium metal. The photoluminescence at room temperature shows a broad red 5d→4f emission band peaked at 725nm which is well matched to the response of silicon photodetectors, and only a very weak...
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