We propose what we believe is a novel optical thermometry strategy (FIR-Ex) based on the fluorescence intensity ratio (FIR) between two radiations associated with the same emission peak but different excitation wavelengths, in contrast to the traditional approach (FIR-Em), which depends on the FIR at varying emission wavelengths. The temperature-dependent FIR within the FIR-Ex strategy arises from the different charge/energy evolution routes, rather than the distribution of thermally coupled levels within the FIR-Em strategy. Considerable diversity in thermal behaviors and luminescence mechanisms was demonstrated by analyzing the 618 nm red emission in Pr3+-doped congruent LiNbO3 (Pr:CLN) under 360 and 463 nm excitations. The temperature sensitivity was further improved via Mg2+ codoping due to the optimization of charge dynamics and energy transfer processes. Given its wide detection scope, relatively high absolute sensitivity at low temperature, and high tunability of temperature sensitivity, the FIR-Ex strategy is promising for developing optical temperature-sensing materials with high performance.

中文翻译：

---

基于由共掺杂 LiNbO3 中不同激发驱动的荧光对比度开发的测温策略

与传统方法 (FIR-Em) 相比，我们提出了一种新的光学测温策略 (FIR-Ex)，该策略基于与相同发射峰但不同激发波长相关的两种辐射之间的荧光强度比 (FIR) ，这取决于不同发射波长下的 FIR。FIR-Ex 策略中的温度相关 FIR 源于不同的电荷/能量演化路线，而不是 FIR-Em 策略中热耦合水平的分布。通过分析 Pr3+ 掺杂的全等 LiNbO3 (Pr:CLN) 在 360 和 463 nm 激发下的 618 nm 红色发射，证明了热行为和发光机制的相当多的多样性。由于电荷动力学和能量转移过程的优化，通过 Mg2+ 共掺杂进一步提高了温度敏感性。FIR-Ex策略具有探测范围广、低温绝对灵敏度相对较高、温度灵敏度可调性高等特点，有望用于开发高性能光学温度传感材料。