With the rapid advancement of modern technology, particularly microelectronics and the Internet of Things (IoT), noncontact thermometry that offers high sensitivity and accuracy, especially under extreme conditions and across a wide temperature range, is desirable yet remains a challenge. In this study, we developed an innovative Ln-MOF-based thermometer integrating fluorescence and magnetism, achieving precise, noncontact temperature sensing across an ultrawide range of 2-483 K. Magnetic susceptibility dominates at low temperatures, while fluorescence intensity and lifetime govern high-temperature sensing, presenting high sensitivity (9.18%.K-1) and low uncertainty (0.04 K) across the entire temperature range. DFT calculations reveal that Eu3+ doping reconstructs the electronic structure, narrowing the bandgap and facilitating thermally activated energy transfer from Tb3+ to Eu3+. This underlies the temperature-dependent emission color shift from green to red. The Ln-MOF exhibits excellent thermal stability and sensing performance, offering a promising platform for remote temperature monitoring in extreme environments.
Gu et al. (Tue,) studied this question.