DOI: 10.22184/1993-7296.FRos.2025.19.6.500.507

The luminescent complexes of terbium and europium with tetrafluoroterephthalic acid and phenanthroline were studied for application in thermometry. It was shown that in contrast to a mixture of individual complexes demonstrating various photodegradation rates, the bimetallic complex retains a stable intensity ratio of the Tb3+ and Eu3+ emission bandswith a general decrease in the luminescence intensity. The composite materials based on the synthesized complexes in polyimide and polystyrene matrices were developed with simultaneous combination of thermosensitive properties with mechanical stability. The results obtained offer opportunities for the development of stable luminescent thermometers for biological and microelectronic applications.