Coumarin 7 functionalized europium-based metal-organic-framework Luminescent composites for dual-mode optical thermometry

摘要: Developing a highly reliable non-contact optical thermometer probe with excellent sensitivity and multi-mode temperature sensing behaviours is always great challenge. Here, dual-emitting luminescent composites fabricated using europium-based metal–organic framework (Eu-MOF) surface-immobilized molecular dye (Coumarin 7) were successfully prepared by simple solvothermal method, followed post-modification strategy. Benefiting from the linear response in fluorescence intensity ratios (FIRs) of Eu3+ to Coumarin 7 molecules range 10 °C 90 °C, composite demonstrated maximum relative (Sr) 0.50% °C−1 at °C. Moreover, observed red-shift emission readout suggests dual-mode thermal mechanism dye-immobilized MOF composite. Their reusability mechanisms have been also investigated. These results demonstrate potential functionalized Eu-MOF as for applications.