Optical thermometry utilizing upconversion (UC) luminescence from lanthanides offers both high sensitivity and swift response times. This technique is grounded in the principle of UC luminescence, a process where low-energy photons (in the near-infrared, NIR spectrum) are transformed into high-energy photons (in the visible spectrum) via the anti-Stokes mechanism.
Firstly, the Yb3+ ions absorb low energy DOI: 10.1007/s12200-023-00083-2
The study was funded by the National Natural Science Foundation of China, the Open Project of Advanced Laser Technology Laboratory of Anhui Province, Major Science and Technology of Anhui Province, the University Natural Science Research Project of Anhui Province, the Natural Science Foundation of Tianjin, and the Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy.