科研之友
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摘要
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 H-2(11/2)/S-4(3/2) and F-4(9/2(1))/F-4(9/2(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 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 Ba2ErF7 nano-glass ceramics may be excellent candidates for optical temperature sensors.
