Revisiting ligand-to-ligand charge transfer phosphorescence emission from zinc(II) diimine bis-thiolate complexes: it is actually thermally activated delayed fluorescence

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dc.contributor.authorLüdtke, Nora
dc.contributor.authorKuhnt, Julia
dc.contributor.authorHeil, Tabea
dc.contributor.authorSteffen, Andreas
dc.contributor.authorMarian, Christel M.
dc.date.accessioned2024-01-11T10:16:15Z
dc.date.available2024-01-11T10:16:15Z
dc.date.issued2022-09-04
dc.description.abstractIn this work we revisit and re-evaluate the photophysical behavior of the prototypical complex [Zn(SC6H4-4-R)2(phen)] as the most in-depth studied type of Zn(II)-based triplet state emitters. Previous reports suggest population of ligand-to-ligand charge transfer (LLCT) states via phenanthroline localized ππ* states, with an energy barrier between the 3ππ* and the bk;1/3LLCT states requiring thermal activation. Besides very weak prompt fluorescence, the dominant radiative mechanism was attributed to phosphorescence. Our photophysical studies, including temperature-dependent quantum yield determination and time-resolved luminescence measurements, reveal a high radiative rate constant kr=3.5×105 s−1 at room temperature and suggest thermally activated luminescence as the major emission path. High-level DFT/MRCI calculations confirm this assignment and provide deeper insight into the excited-state kinetics, including rate constants for the (reverse) intersystem crossing processes. Thus, our study demonstrates that further optimization of the photophysical properties of this type of Zn(II) triplet exciton emitter bears great potential for future application in devices.en
dc.identifier.urihttp://hdl.handle.net/2003/42274
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-24111
dc.language.isoende
dc.relation.ispartofseriesChemPhotoChem;7(1)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/de
dc.subjectDensity functional calculationsen
dc.subjectExcited statesen
dc.subjectPhosphorescenceen
dc.subjectThermally amplified delayed fluorescenceen
dc.subjectZincen
dc.subject.ddc540
dc.titleRevisiting ligand-to-ligand charge transfer phosphorescence emission from zinc(II) diimine bis-thiolate complexes: it is actually thermally activated delayed fluorescenceen
dc.typeTextde
dc.type.publicationtypeResearchArticlede
dcterms.accessRightsopen access
eldorado.secondarypublicationtruede
eldorado.secondarypublication.primarycitationN. Lüdtke, J. Kuhnt, T. Heil, A. Steffen, C. M. Marian, ChemPhotoChem 2023, 7, e202200142.de
eldorado.secondarypublication.primaryidentifierDOI https://doi.org/10.1002/cptc.202200142de

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