Opt Lett. 2015 Aug 1;40(15):3607-10. doi: 10.1364/OL.40.003607.
Transparent bulk glass ceramic containing Cr3+:LiGa5O8 nanoparticles was fabricated as an alternative for monocrystal to explore the possible application in fluorescence lifetime-based temperature sensing. Such glass ceramic exhibited deep-red luminescence upon the excitation of the wide wavelength range of visible light. Impressively, the Cr3+ lifetime dramatically decreased from 2.45 to 0.22 ms with the temperature increasing from 293 to 563 K, owing to the competition of radiation transitions from the thermally coupled 2E and 4T2 excited states. A two-level kinetic model was adopted to interpret this temperature-dependent luminescence of Cr3+, which gave a highest temperature sensitivity of 1.15% K(-1).
透明块状玻璃陶瓷中含有 Cr3+:LiGa5O8 纳米粒子，可作为单晶的替代品，用于荧光寿命型温度传感的研究。这种玻璃陶瓷在可见光宽波长范围内激发时表现出深红光发射。令人印象深刻的是，Cr3+ 的寿命从 2.45 毫秒急剧降低到 0.22 毫秒，温度从 293 升高到 563 K，这归因于来自热耦合 2E 和 4T2 激发态的辐射跃迁的竞争。采用双能级动力学模型来解释 Cr3+ 的这种温度相关发光，其给出了 1.15% K(-1)的最高温度灵敏度。
