Tunable Anti-Thermal Quenching Luminescence of Eu³⁺-Doped Metal-Organic Framework and Temperature-Dependent Photonic Coding

Applications of luminescence at high temperature such as high-power lighting, lasing, thermophotovoltaics, and photonic coding, are severely prevented due to the notorious thermal quenching (TQ). Although anti-TQ luminescence (anti-TQL) is reported using highly oxygen-coordinated solid-state oxide as host in virtue of the rigid skeleton that resists lattice vibration at elevated temperatures, it is meaningful to extend anti-TQL to other hosts. Herein, taking advantage of the ligand-metal antenna effect and the negative thermal expansion feature of Eu3+ doped MIL-68-In (MIL-68-In/xEu), adjustable anti-TQL is realized for the first time, that is, anti-TQ, zero-TQ, and TQ at x = 5%, 10%, and 50%, respectively. Therefore, except for added novel mechanisms, this work has also expanded the hosts available for high-temperature luminescence and enabled advanced photonic coding in terms of facial synthesis, rich information, and visual changes of emission intensity instead of device-dependent analogous.