Design and fabrication of contactless optical thermometer with rapid and accurate performance has become a research hotspot in recent years. Herein, CaSc₂O₄: Yb³⁺/Er³⁺ is employed as the intermediary for temperature sensing under the excitation of 980 nm, which is proven to afford an ultra‐sensitive and high‐resolution optical thermometry in multiple ways based on the fluorescence intensity ratio (FIR) technology. The optimal thermal sensing behaviors are realized by the FIR of Er³⁺:²H_11/2 → ⁴I_15/2 to ⁴S_3/2 → ⁴I_15/2 transition, which has a relative sensitivity of 1184/T² and a minimal resolution of 0.03 K along with a maximal absolute error of 0.96 K. Besides that, the FIR between the thermally coupled Stark sublevels of Er³⁺:⁴F_9/2 manifold (FIR_R) as well as that of Er³⁺: ⁴I_13/2 manifold (FIR_N) can also provide excellent optical thermometry. The relative sensitivity of FIR_R‐based and FIR_N‐based optical thermometers are calculated to be 402/T² and 366/T², respectively, with a same minimal resolution of 0.09 K, which possess the potential to be used for biomedicine due to the inherent advantage of their operating wavelengths located in the biological window. The results demonstrate that CaSc₂O₄: Yb³⁺/Er³⁺ is a promising candidate for temperature sensing with multipath, high sensitivity, and superior resolution.

中文翻译：

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CaSc2O4：Yb3 + / Er3 +中实现的多路径光学测温法具有高灵敏度和出色的分辨率

具有快速，准确性能的非接触式光学温度计的设计与制造已成为近年来的研究热点。在这里，CaSc ₂ O ₄：Yb ³⁺ / Er ³⁺被用作在980 nm激发下进行温度感测的媒介，事实证明，该方法可以基于多种方式提供超灵敏和高分辨率的光学测温法。荧光强度比（FIR）技术。最佳的热感应行为通过Er ³⁺的FIR实现：² H ₁₁ / ²  →  ⁴ I _15/2至⁴ S _3/2 →  ⁴我_15/2过渡，其具有1184 / T的相对灵敏度²和0.03的最小分辨率 ķ与0.96的最大绝对误差沿 ķ。除此之外，FIR Er构成的一热耦合斯塔克能级之间³⁺：⁴ ˚F _9/2歧管（FIR _{- [R} ），以及该铒³⁺：  ⁴我_13/2歧管（FIR _Ñ）还可以提供优异的光学测温法。基于FIR _R和FIR _N的相对灵敏度基于光学的温度计测得的分别为402 / T ²和366 / T ²，相同的最小分辨率为0.09  K，由于它们位于工作波长的固有优势，它们具有用于生物医学的潜力。生物窗口。结果表明，CaSc ₂ O ₄：Yb ³⁺ / Er ³⁺是具有多径，高灵敏度和优异分辨率的温度感测的有前途的候选者。