Transparent novel Ba 2 ErF 7 nano-glass ceramics was fabricated by melt-quenching technique. X-ray diffraction and transmission electron microscopy analyses show that tetragonal Ba 2 ErF 7 nano-crystals are homogeneously precipitated among the glass matrix. The 2 H 11/2 / 4 S 3/2 and 4 F 9/2(1) / 4 F 9/2(2) levels of Er 3? are proved as thermally coupled energy levels (TCL) by analyzing fluorescence intensity ratios of 523 nm/548 nm and 654 nm/666 nm emissions of Ba 2 ErF 7 glass ceramics. Temperature-dependent spectra show that Ba 2 ErF 7 nanoglass ceramics present broad operating temperature range, large energy gap of TCL (844 cm -1 ), and high theoretical maximum value of relative sensitivity, which suggests that Ba 2 ErF 7 nano-glass ceramics may be excellent candidates for optical temperature sensors.
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