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Thermally Activated Photophysical Processes of Organolanthanide Complexes in Solution. | LitMetric

Thermally Activated Photophysical Processes of Organolanthanide Complexes in Solution.

J Phys Chem Lett

Department of Chemistry, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong S.A.R., P. R. China.

Published: June 2022

AI Article Synopsis

Article Abstract

The effect of temperature upon the lanthanide luminescence lifetime and intensity has been investigated in toluene solution for the complexes (Ln = Eu, Sm, Nd, Yb; Phen = 1,10-phenanthroline; TTA = thenoyltrifluoroacetonate). Thermally excited back-transfer to a charge transfer state was found to occur for Ln = Eu and can be explained by lifetime and intensity back-transfer models. The emission intensity and lifetime were also quenched with increasing temperature for Ln = Sm, and the activation energy for nonradiative decay is similar to that for the thermal population of Sm excited states. Unusual behavior for lifetime and intensity was found for both Ln = Nd, Yb. The usually assumed equivalence of τ/τ = / (where τ is lifetime and is intensity) does not hold for these cases. We infer that for these lanthanide systems the intensity decreases with temperature in the stage prior to population of the luminescent state. The lifetime changes are discussed.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9169037PMC
http://dx.doi.org/10.1021/acs.jpclett.2c01350DOI Listing

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