Role of LMCT States in Luminescence Excitation Processes in Europium Indolecarboxylates

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 li...

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Bibliographic Details
Published in:Optics and spectroscopy 2023-10, Vol.131 (10), p.1103-1111
Main Authors: Tsaryuk, V. I., Zhuravlev, K. P.
Format: Article
Language:English
Subjects:
Acetates
Carboxylates
Charge transfer
Electron states
Energy transfer
Europium
Europium compounds
Excitation spectra
Lasers
Ligands
Luminescence
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Quenching
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Summary: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 5 D 0 (Eu 3+ ) and 5 D 4 (Tb 3+ ) 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 5 D 0 state of the Eu 3+ 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.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X23100259