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Photoluminescence, radioluminescence and thermoluminescence properties of K 2 YF 5 crystals containing different concentrations of samarium and terbium ions have been investigated for the first time. It has been found that the emission peaks observed in ranges from 300 to 550nm and from 550 to 750nm can be attributed to the 4f–4f transitions of the Tb 3+ ions and the Sm ...