Fluorescence intensity ratio temperature sensing of Dy1-xTbx-datrz MOF with dual characteristic emission

Abstract

A series of dual-lanthanide metal-organic frameworks (Dy_1-xTb_x-datrz MOFs) have been synthesized successfully via solvothermal method using DMF solution and confirmed by XRD and FT-IR patterns, which were further revealed as the structure composed of regular block crystals by SEM observation. Subsequently, the solid-state luminescence spectra of all the Dy_1-xTb_x-datrz MOFs showed the dual characteristic emission peaks of Dy³⁺ and Tb³⁺ under the excitation at 350 nm. Meanwhile, a concentration quenching effect was found like monometallic luminescence MOF, among which Dy_0.5Tb_0.5-datrz exhibited the strongest emission intensity. Notably, the ratio-metric fluorescence temperature sensing performance and thermal cycle stability of Dy_0.5Tb_0.5-datrz were investigated, of which the sensitivity value (Sr) ranged from 0.2737 %K⁻¹ to 0.4421 %K⁻¹ and δT value varied between 0.0300K and 0.0485K during 293K–473K, combined with a good thermal cycle stability. Therefore, Dy_0.5Tb_0.5-datrz with dual characteristic emission has the potential for ratio-metric fluorescence temperature sensing.