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Nanocrystalline transparent BaF 2 :Eu 3+ glass-ceramic materials emitting reddish-orange light were fabricated using a low-temperature sol-gel method. Several experimental techniques were used to verify structural transformation from precursor xerogels to sol-gel glass-ceramic materials containing fluoride nanocrystals. Thermal degradation of xerogels was analyzed by thermogravimetric analysis (TG) and differential scanning calorimetry method (DSC). The presence of BaF 2 nanocrystals dispersed in sol-gel materials was confirmed by the X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM). In order to detect structural changes in silica network during annealing process, the infrared spectroscopy (IR-ATR) was carried out. In particular, luminescence spectra of Eu 3+ and their decays were examined in detail. Some spectroscopic parameters of Eu 3+ ions in glass-ceramics containing BaF 2 nanocrystals were determined and compared to the values obtained for precursor xerogels. It was observed, that the intensities of two main red and orange emission bands corresponding to the 5 D 0 → 7 F 2 electric-dipole transition (ED) and the 5 D 0 → 7 F 1 magnetic-dipole (MD) transition are changed significantly during transformation from xerogels to nanocrystalline BaF 2 :Eu 3+ glass-ceramic materials. The luminescence decay analysis clearly indicates that the measured lifetime 5 D 0 (Eu 3+ ) considerably enhanced in nanocrystalline BaF 2 :Eu 3+ glass-ceramic materials compared to precursor xerogels. The evident changes in luminescence spectra and their decays suggest the successful migration of Eu 3+ ions from amorphous silica network to low-phonon BaF 2 nanocrystals.

Reddish-Orange Luminescence from BaF2:Eu3+ Fluoride Nanocrystals Dispersed in Sol-Gel Materials