Tailoring the triplet level of isomorphic Eu/Tb mixed MOFs for sensitive temperature sensing

Abstract

Three different thermo-responsive fluorescent thermometers were constructed by regulating the triplet energy level of organic ligands in isostructural Eu/Tb mixed MOFs. Among them, a quite unusual and rarely reported temperature-dependent fluorescence behavior was observed in LnBDC-NH₂, and Eu_0.01Tb_0.99NDC is effective in the physiological range with the maximum relative sensitivity of 7.32% °C^-1.