An
important result of research on mixed-lanthanide metal–organic
frameworks (M′LnMOFs) is the realization of highly sensitive
ratiometric luminescent thermometers. Here, we report the design and
synthesis of the new M′LnMOF Tb0.80Eu0.20BPDA with high relative sensitivity in the physiological temperature
regime (298–318 K). The emission intensity and luminescence
lifetime were investigated and compared to those of existing materials.
It was found that the temperature-dependent luminescence properties
of Tb0.80Eu0.20BPDA are strongly associated
with the distribution of the energy levels of the ligand. Such a property
can be useful in the design of highly sensitive M′LnMOF thermometers.