Singlet Heterofission in Tetracene-Pentacene Thin-Film Blends.
blends
energy transfer
singlet fission
thin films
time-resolved spectroscopy
Journal
Angewandte Chemie (International ed. in English)
ISSN: 1521-3773
Titre abrégé: Angew Chem Int Ed Engl
Pays: Germany
ID NLM: 0370543
Informations de publication
Date de publication:
02 Nov 2020
02 Nov 2020
Historique:
received:
22
05
2020
revised:
31
07
2020
pubmed:
8
8
2020
medline:
8
8
2020
entrez:
8
8
2020
Statut:
ppublish
Résumé
Heterofission is a photophysical process of fundamental and applied interest whereby an excited singlet state is converted into two triplets on chemically distinct chromophores. The potential of this process lies in the tuning of both the optical band gap and the splitting between singlet and triplet energies. Herein, we report the time-domain observation of heterofission in mixed thin films of the prototypical singlet fission chromophores pentacene and tetracene using excitation wavelengths above and below the tetracene band gap. We found a time constant of 26 ps for endothermic heterofission of a singlet exciton on pentacene in blends with low pentacene fractions, which was outcompeted by pentacene homofission for increasing pentacene concentrations. Direct excitation of tetracene lead to fast energy transfer to pentacene and subsequent singlet fission, which prevented homo- or heterofission of a singlet exciton on tetracene.
Identifiants
pubmed: 32761935
doi: 10.1002/anie.202007412
pmc: PMC7820980
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
19966-19973Informations de copyright
© 2020 Wiley-VCH GmbH.
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