Rare Earth-Based Metal–Organic Frameworks with Photomagnetic Dual-Mode for Ultrawide Range Noncontact Temperature Sensing

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.