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Transparent novel glass-ceramics containing Sr 2 YbF 7 :Er 3+ nanocrystals were successfully fabricated by melt-quenching technique. Their structural and up-conversion luminescent properties were systemically investigated by XRD, HRTEM, and a series of spectroscopy methods. The temperature-dependent upconversion spectra prove that 2 H 11/2 and 4 S 3/2 levels of Er 3+ are thermally coupled energy levels (TCEL). Consequently, the 2

The development of scintillators is of fundamental and industrial meaning for their diverse applications. Despite the great advance in scintillating mono-crystals, challenge remains to search for novel scintillating materials with low cost, large volume, and high efficiency. Here, Tb 3+ -doped glass ceramics (GC) with crystallized Lu 6 O 5 F 8 nano-crystals were prepared and characterized as potential X-ray scintillators. Their structural, optical, and luminescent properties were explored systematically. After thermal treatment, X-ray excited luminescence (XEL) intensity from Lu 6 O 5 F 8 :Tb 3+ GC is greatly increased and the relative intensity is about 64% of commercial BGO scintillator, benefiting from preferential enrichment of Tb 3+ ions into Lu 6 O 5 F 8 nano-crystals with low phonon energy. Moreover, unusual decay behaviors of Tb 3+ emissions in GC sample are observed and discussed. Our results indicate that rare earth doped GC may offer a novel platform for designing and fabricating new scintillating materials in the future.

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