温度是物理、化学、生命科学和工程技术领域极其重要的参量。抗干扰、高灵敏度、高空间分辨率和快速响应的温度传感具有重要科学意义和应用价值。基于热耦合能级的荧光强度比测温因其自校准优势，成为一种具有重要前景的温度传感手段，但现有机制受热耦合、加热效应和强度比过小等制约，其灵敏度难以进一步提升。拟从如下三方面突破这些局限性：(1) 探索把激发基态变成激发占据数剧烈依赖温度的低激发态的温度探测机制；(2) 探索突破4f(n)能级局限后，使得热耦合能级间隔大大增加同时热耦合上能级的跃速率相对下能级具有量级提升的离子（如Sm2+、Cr3+）和合适基质，大幅提高灵敏度；(3) 研究利用能量传递、多声子弛豫等动力学过程或阶梯能级辅助热耦合等的荧光温度探测机制和材料。预期在三个方面建立提升温度探测灵敏度的具体机制并得到一系列性能优异的测温材料，并通过实验验证其消热效应、抗干扰、高空间分辨和快速响应特性。

Temperature is a significant parameter for determining the state of matter in physics, chemistry, bioscience, as well as engineering and technical fields. It is of great significance to explore temperature sensing materials with high sensitivity, high spatial and time resolutions, and stable performance. The fluorescence intensity ratio (FIR) technique based on the thermally coupled energy levels is an appreciated way of measuring temperature, due to its advantage of self-calibration. However, the meaningful improvement for temperature sensitivity based on 4f-4f transition in temperature-measurement materials is greatly restricted, which is ascribed to thermal coupling principle, heating effect and weak FIR. .In order to realize a meaningful breakthrough, this research project focuses on the following three aspects: (1) To achieve temperature sensing with high sensitivity and negligible heating effect by utilizing the excitation of temperature dependent population of thermal excited states; (2) To explore the mechanism of non 4f-4f transition so as to increase the energy gap while maintaining the scale of intensity ratio (such as in some Sm2+ and Cr3+ activated materials); (3) To explore other mechanisms based on energy transfer, multiphonon process and ladder-level assisted thermal coupling. It is expected that some stable thermographic materials of high sensitivity, spatial and time resolution will be obtained based on those novel mechanisms. Throughout experimental characterization and verification will be performed on those materials to confirm their advantages.