光子上转换
纳米探针
材料科学
灵敏度(控制系统)
光电子学
发光
纳米技术
纳米颗粒
电子工程
工程类
作者
Li He,J. S. Huang,Zhengce An,Haozhang Huang,Yu-Jun Zhao,Kai Zhong,Bo Zhou
标识
DOI:10.1016/j.jlumin.2023.120306
摘要
Upconversion-based optical thermometry has many merits, such as quick temperature response, higher thermal sensitivity and robust reliability. However, the previous works were mainly focused on the thermally coupled emisisons, limiting their thermal sensitivity due to the intrinsic constraint by small energy gaps (e.g., <2000 cm−1) according to Boltzmann distribution theory. Here, we report a design of NaYF4:Yb3+/Tm3+@NaYF4 core-shell nanostructure to achieve thermochromic upconversion and high thermal sensitivity by taking advantage of nonthermally coupled upconversion emisions of Tm3+. We show that the blue upconversion emission of Tm3+ at 475 nm (1G4‒3H6) exhibits a regular decrease with elevating temperature, while its deep-red emission at 696 nm (3F2,3‒3H6) presents an increase. Such a feature leads to a rapid rise of luminescence intensity ratio (I696 nm/I475 nm) and the optimal relative sensitivity (Sr) reaches 2.79 % K−1 (503 K). More interestingly, the sample gives rise to a gradual emission color change from blue to purplish-red with lifting temperature. Our results offer a new class of upconversion-based nonoprobe with high thermal sensitivity and observable emission color variation, showing a great potential for nanoprobe and information security.
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