Changes in Luminescence Characteristics of Terbium Hydroxybenzoates in Condensed Matter

Abstract

Changes in the luminescence characteristics of Tb³⁺ complexes with hydroxybenzoic acids in the series true solution–viscous medium of a water-soluble polymer (WSP)–WSP film have been studied. The existence of oxygen-containing functional groups in WSPs and the possibility of their coordination to Tb3+ ions, as well the viscous medium created by WSPs, are responsible for changes in characteristics of the complexes, such as luminescence intensity and lifetime. Interligand energy transfer (\({E_{{T_1}}}\left( {Lig} \right) \geqslant {E_{{T_1}}}\left( {WSP} \right)\)) in viscous media leads either to an increase or a decrease in luminescence intensity; however, it is increased multifold in films.