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Fluorescence in flux-grown single crystals of lithium praseodymium tetraphosphate (LiPrP4O12) and lithium thulium tetraphosphate (LiTmP4O12) has been studied under UV excitations with LEDs at six wavelengths between 245nm and 315nm. The emissions observed at room temperature have been assigned by means of known energy-level differences from absorptions of the same single crystals. Many more 4f–4f...