Abstract Bismuth Vanadate (BiVO4) is a well-known industrial pigment, a microwave dielectric material as well as an efficient photocatalyst for the degradation of organic pollutants and photoelectrochemical water splitting. Here, we report a BiVO4-based upconversion ceramic material for high-sensitivity and high-temperature optical thermometry. Yb/Er-doped BiVO4 (BiVO4:Yb/Er) ceramic is prepared by microwave hydrothermal synthesis. The as-synthesized sample exhibits intense green and red emissions under 980 nm and 490 nm excitations. Temperature-dependent emission properties are investigated using 980 nm excitation in the temperature range of 298–873 K and the fluorescence intensity ratio method is used to study the temperature sensing properties of BiVO4:Yb/Er ceramics with reference to the thermally coupled as well as non-thermally coupled energy levels of Er3+. The maximum sensitivity based on the thermally coupled levels of Er3+ is 61.2×10−4 K−1 at 448 K and that based on the non-thermally coupled levels is 801×10−4 K−1 at an unprecedented high operating temperature of 873 K. Moreover, a fairly broad temperature sensing range of 325 K (sensitivity not less than 60.0×10−4 K−1) can be achieved, which is better than those of the reported optical thermometric materials (~200 K).

中文翻译：

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用于高灵敏度和高温光学测温的 BiVO4 陶瓷

摘要 钒酸铋（BiVO4）是一种著名的工业颜料、微波介电材料以及高效的光催化剂，用于降解有机污染物和光电化学分解水。在这里，我们报告了一种用于高灵敏度和高温光学测温的基于 BiVO4 的上转换陶瓷材料。Yb/Er 掺杂 BiVO4 (BiVO4:Yb/Er) 陶瓷是通过微波水热合成制备的。合成样品在 980 nm 和 490 nm 激发下表现出强烈的绿色和红色发射。在 298–873 K 的温度范围内使用 980 nm 激发研究温度相关的发射特性，并使用荧光强度比方法研究 BiVO4 的温度传感特性：Yb/Er 陶瓷参考 Er3+ 的热耦合和非热耦合能级。基于 Er3+ 热耦合能级的最大灵敏度在 448 K 时为 61.2×10-4 K-1，基于非热耦合能级的最大灵敏度为 801×10-4 K-1，在 873 度的前所未有的高工作温度下K.此外，可以实现相当宽的温度传感范围 325 K（灵敏度不低于 60.0×10-4 K-1），这优于报道的光学测温材料（~200 K）。