Abstract Er3+ doped phosphate glasses with the composition 75NaPO3-25CaF2 (mol%) were prepared at different melting temperatures to demonstrate the importance to quantify the fluorine content when preparing oxyfluoride glasses. Indeed, increasing the melting temperature from 900 to 1000 °C leads to a small reduction in the fluorine content from 9.4 at % to 8.8 at % as quantified using EPMA. Whereas this loss of fluorine can be suspected from small changes in the thermal properties of the glass, it increases significantly the glass crystallization tendency in this glass system. This means that a heat treatment of the as-prepared glass should be performed when evaporation of fluorine during the glass melting is suspected. Sample preparation for the characterization of the spectroscopic properties of the glasses is discussed here as well; bulk glasses should be used when measuring the spectroscopic properties of oxyfluoride glasses, which are known to be hygroscopic. It is shown, in this work, that a heat treatment of the glass within the investigated glass system leads to transparent glass-ceramics with volume precipitation of Er3+ doped CaF2 crystals with strong upconversion.

中文翻译：

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Er3+ 氟氧化物磷酸盐玻璃和玻璃陶瓷中的氟损失

摘要 在不同的熔化温度下制备了组成为 75NaPO3-25CaF2 (mol%) 的 Er3+ 掺杂磷酸盐玻璃，以证明在制备氟氧化物玻璃时量化氟含量的重要性。事实上，将熔化温度从 900°C 提高到 1000°C 会导致氟含量从 9.4 at % 小幅减少到 8.8 at %（使用 EPMA 进行量化）。尽管可以从玻璃热性能的微小变化中怀疑这种氟的损失，但它会显着增加该玻璃系统中的玻璃结晶趋势。这意味着当怀疑在玻璃熔化过程中氟会蒸发时，应对所制备的玻璃进行热处理。此处还讨论了用于表征玻璃光谱特性的样品制备；测量氟氧化物玻璃的光谱特性时应使用大块玻璃，众所周知，氟氧化物玻璃具有吸湿性。在这项工作中表明，在所研究的玻璃系统中对玻璃进行热处理会产生透明的玻璃陶瓷，其中含有 Er3+ 掺杂的 CaF2 晶体的体积沉淀，具有很强的上转换。