AbstractThe authors describe an ethylene glycol assisted precipitation method for synthesis of Er(III)/Yb(III)-doped BiF3 nanoparticles (NPs) at room temperature. Under 980-nm light irradiation, the NPs emit upconversion (UC) emission of Er(III) ions as a result of a two-photon absorption process. The temperature-dependent green emissions (peaking at 525 and 545 nm) are used to establish an unambiguous relationship between the ratio of fluorescence intensities and temperature. The NPs have a maximum sensitivity of 6.5 × 10−3 K−1 at 619 K and can be applied over the 291–691 K temperature range. The results indicate that these NPs are a promising candidate for optical thermometry. Graphical abstractSchematic of the room-temperature preparation of Er(III)/Yb(III)-doped BiF3 nanoparticles with strongly temperature-dependent upconversion emission.

中文翻译：

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用于光学测温的 Er(III)/Yb(III) 掺杂 BiF3 上转换纳米粒子的合成

摘要作者描述了一种在室温下合成 Er(III)/Yb(III) 掺杂的 BiF3 纳米粒子 (NPs) 的乙二醇辅助沉淀方法。在 980 nm 光照射下，由于双光子吸收过程，NPs 发出 Er(III) 离子的上转换 (UC) 发射。与温度相关的绿色发射（在 525 和 545 nm 处达到峰值）用于建立荧光强度与温度之比之间的明确关系。NPs 在 619 K 时的最大灵敏度为 6.5 × 10−3 K−1，可应用于 291–691 K 温度范围。结果表明，这些 NPs 是光学测温的有希望的候选者。具有强烈温度依赖性上转换发射的 Er(III)/Yb(III) 掺杂 BiF3 纳米粒子的室温制备示意图。