Fluorescence from ions in both the crystal and glass phases was investigated by selective excitation of Tm3+ doped transparent oxyfluoride glass ceramics containing LaF3 nanocrystals. The spectroscopic properties of ions in different local environments were studied. It was found that the glass phase favored blue up-conversion of Tm3+ when a pulsed red light was applied. The most efficient up-conversion was obtained when the excited state absorption was resonant with the excitation.

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