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Mn2+ ion doped Na5Lu9F32 single crystals are grown by an improved Bridgman method. The absorption and fluorescence spectrum of single crystals in the range of 300–800 nm are measured to investigate the spectral properties. Fluorescent band centered at 550 nm was observed in the fluorescence spectrum of the crystals corresponding to the 4T1(4G) → 6A1(6S) transition of the Mn2+ ion. An excitation peak...
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