Zhuravlev K. P., Tsaryuk V. I.
Role of LMCT states in luminescence excitation processes in europium indolecarboxylates, Optics and Spectroscopy.
Optics and Spectroscopy
, 2022
, 132 (1).
С. 115-122.
ISSN 2782-6694
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Аннотация
The luminescence excitation energy transfer in europium and terbium indole-3-carboxylates, indole-3-acetates and indole-3-propionates as well as ternary indolecarboxylates containing 1,10-phenanthroline and 2,2'-bipyridine molecules have been studied. The luminescence excitation spectra, the lifetimes of the 5D0 (Eu3+) and 5D4 (Tb3+) states, and the luminescence intensity are analyzed. The decisive role of ligand-metal charge transfer (LMCT) states in the quenching of the luminescence of europium aromatic carboxylates containing a π-excessive pyrrole or indole fragment is demonstrated. Most europium compounds are characterized by quenching due to the depopulation of the 5D0 state of the Eu3+ ion through the low-energy LMCT state. But in some ternary compounds, the LMCT state being of higher energy participates in the nonradiative depopulation of the excited electronic states of the ligand.
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Role of LMCT states in luminescence excitation processes in europium indolecarboxylates, Optics and Spectroscopy. (deposited 25 Окт 2023 11:45)
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