Abstract
Transparent novel Ba2ErF7 nano-glass ceramics was fabricated by melt-quenching technique. X-ray diffraction and transmission electron microscopy analyses show that tetragonal Ba2ErF7 nano-crystals are homogeneously precipitated among the glass matrix. The 2H11/2/4S3/2 and 4F9/2(1)/4F9/2(2) levels of Er3+ 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 Ba2ErF7 glass ceramics. Temperature-dependent spectra show that Ba2ErF7 nano-glass 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 Ba2ErF7 nano-glass ceramics may be excellent candidates for optical temperature sensors.
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