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The Er 3 + doped transparent oxyfluoride glassceramics containing Sr 2 Gd F 7 nanocrystals were prepared and their spectroscopic properties were discussed. The formation of Sr 2 Gd F 7 nanocrystals in the glassceramics was confirmed by x-ray diffraction. The split peaks of the upconversion and near infrared emission bands of the Er 3 + dopedglassceramics can be observed. The upconversion luminescence intensity of Er 3 + in the glassceramics increased significantly with the increasing heat treated temperature. The luminescence decay curves and time-resolved spectra indicated that the lifetime of the S 3 ∕ 2 4 state of Er 3 + in the glassceramic was longer than that in the glass.
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