Abstract Non-contact thermometry operating at the sub-micrometer level based on self-referencing upconversion (UC) micro-nanomaterial is an attractive pursuit for optical thermometers. Here, a novel accordion-like Y2O3:Er3+ nanothermometer with green/red UC luminescence is obtained from the solvent-free grinding and the following temperature-programmed calcination of the Er3+-doped Y-containing metal-organic framework (MOF) precursor. Upon 980 nm laser irradiation, the as-prepared Y2O3:Er3+ exhibits dual-emitting green and red emissions originating from Er3+ ions with a two-photon UC process, and the intensities are strongly dependent on temperature. The optical thermometry behaviours of Y2O3:Er3+ nanothermometer using the fluorescence intensity ratio (FIR) technique are studied in the temperature range of 298–393 K within the physiological temperature, in which the thermally coupled levels of two green emissions and another pair of coupled levels with red and green emissions are comparatively investigated. A relative large calculated energy gap ΔE (951 cm−1) for the thermally couple levels of 2H11/2 and 4S3/2 and a maximum absolute sensitivity (Sa) of 0.0027 K−1 at 393 K are determined, respectively. This novel accordion-like Y2O3:Er3+ nanothermometer exhibits excellent optical sensing stability and high temperature resolution, demonstrating its great potential as reliable and promising optical thermometers.

中文翻译：

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用于比例温度传感应用的手风琴状 Y2O3:Er3+ 纳米温度计的简便合成

摘要 基于自参考上转换 (UC) 微纳米材料的亚微米级非接触式温度测量是光学温度计的一个有吸引力的追求。在这里，一种新型的手风琴状 Y2O3:Er3+ 纳米温度计具有绿色/红色 UC 发光，是通过无溶剂研磨和以下程序升温煅烧 Er3+ 掺杂的含 Y 的金属有机框架 (MOF) 前体获得的。在 980 nm 激光照射下，制备的 Y2O3:Er3+ 表现出源自 Er3+ 离子的双光绿色和红色发射，其强度与温度密切相关。Y2O3的光学测温行为：Er3+ 纳米温度计采用荧光强度比 (FIR) 技术在生理温度范围内的 298-393 K 温度范围内进行研究，其中两种绿色发射的热耦合水平和另一对红色和绿色发射的耦合水平比较调查。分别确定了 2H11/2 和 4S3/2 热偶能级的相对较大的计算能隙 ΔE (951 cm-1) 和 393 K 时 0.0027 K-1 的最大绝对灵敏度 (Sa)。这种新型手风琴状 Y2O3:Er3+ 纳米温度计具有出色的光学传感稳定性和高温分辨率，显示出其作为可靠和有前途的光学温度计的巨大潜力。其中比较研究了两种绿色排放的热耦合水平和另一对红色和绿色排放的耦合水平。分别确定了 2H11/2 和 4S3/2 热偶能级的相对较大的计算能隙 ΔE (951 cm-1) 和 393 K 时 0.0027 K-1 的最大绝对灵敏度 (Sa)。这种新型手风琴状 Y2O3:Er3+ 纳米温度计具有出色的光学传感稳定性和高温分辨率，显示出其作为可靠和有前途的光学温度计的巨大潜力。其中比较研究了两种绿色排放的热耦合水平和另一对红色和绿色排放的耦合水平。分别确定了 2H11/2 和 4S3/2 热偶能级的相对较大的计算能隙 ΔE (951 cm-1) 和 393 K 时 0.0027 K-1 的最大绝对灵敏度 (Sa)。这种新型手风琴状 Y2O3:Er3+ 纳米温度计具有出色的光学传感稳定性和高温分辨率，显示出其作为可靠和有前途的光学温度计的巨大潜力。