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The influence of the alkyl substituent in ligands and temperature on the luminescence of terbium complexes

Shmelkov K.D., Kharcheva A.V., Ivanov A.V., Borisova N.E., Patsaeva S.V.
Lomonosov Moscow State University, Moscow, Russia


The study of new luminescent compounds is an important task of modern optics and spectroscopy. Rare earth elements coordination compounds are important objects of research due to their narrow bands, long lifetime and high luminescence intensity. Terbium complexes emit light in the visible wavelength range with the most intense peak in the green region. The aim of this work was to study the effect of the alkyl substituent in ligands based on 2,2´-bipyridyl-6,6´-dicarboxamides and temperature on the luminescent properties of terbium complexes. The luminescence spectra of the terbium complexes were recorded on a Hitachi F-7000 luminescence spectrometer at room temperature and in liquid nitrogen. The luminescence emission spectra of terbium complexes contain trivalent terbium ion characteristic peaks corresponding to the 5D4 → 7F6, 5D4 → 7F5, 5D4 → 7F4, and 5D4 → 7F3 transitions. The luminescence excitation spectra contain bands corresponding to the absorption of light by the ligand, as well as direct absorption of light by terbium ions. Luminescence lifetimes of terbium complexes are determined at room temperature and in liquid nitrogen.

This research was funded by Russian Science Foundation, grant number 23-22-00103


Anastasiia V. Kharcheva
Lomonosov Moscow State University


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