Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5398792 | Journal of Luminescence | 2015 | 5 Pages |
Abstract
In this work we discuss the observed Tb3+ ion luminescence quenching, due to the relative ligand low lying triplet state energy, in the [Tb(tta)3 (H2O)2] compound at low and room temperature (tta=thenoyltrifluoroacetonate). Theoretical energy transfer rates, for both multipolar and exchange mechanisms, were calculated and discussed on the basis of selection rules and energy mismatch conditions from the [Tb(tta)3 (H2O)2] emission spectra. We have concluded that the exchange mechanism by far dominates, in the present case, and that the long first excited state 7F5 lifetime (in the millisecond scale) plays a crucial role in the Tb3+ luminescence quenching.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
A.S. Souza, L.A. Nunes, M.C.F.C. Felinto, H.F. Brito, O.L. Malta,