The luminescence behaviors of Er3+ doped glass ceramics containing Sr2RF7(R=Y,Gd,La) nanocrystals were investigated. The formation of Sr2RF7 nanocrystals in the glass ceramics was confirmed by x-ray diffraction and high resolution transmission electron microscopy. Energy dispersive x-ray spectroscopy analysis showed that the Er3+ ions were efficiently incorporated in Sr2GdF7 nanocrystals. The efficient upconversion luminescence of the Er3+ in the glass ceramics can be observed. The lifetime of the Er3+ in the glass ceramics was found to be much longer than that in the glass due to the lower phonon energy of fluoride crystals when Er3+ entered efficiently fluoride crystals in the glass ceramics.

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