Cargando…

Singlet Heterofission in Tetracene–Pentacene Thin‐Film Blends

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 triple...

Descripción completa

Detalles Bibliográficos
Autores principales: Zeiser, Clemens, Moretti, Luca, Lepple, Daniel, Cerullo, Giulio, Maiuri, Margherita, Broch, Katharina
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7820980/
https://www.ncbi.nlm.nih.gov/pubmed/32761935
http://dx.doi.org/10.1002/anie.202007412
_version_ 1783639325405085696
author Zeiser, Clemens
Moretti, Luca
Lepple, Daniel
Cerullo, Giulio
Maiuri, Margherita
Broch, Katharina
author_facet Zeiser, Clemens
Moretti, Luca
Lepple, Daniel
Cerullo, Giulio
Maiuri, Margherita
Broch, Katharina
author_sort Zeiser, Clemens
collection PubMed
description 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.
format Online
Article
Text
id pubmed-7820980
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-78209802021-01-26 Singlet Heterofission in Tetracene–Pentacene Thin‐Film Blends Zeiser, Clemens Moretti, Luca Lepple, Daniel Cerullo, Giulio Maiuri, Margherita Broch, Katharina Angew Chem Int Ed Engl Research Articles 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. John Wiley and Sons Inc. 2020-09-30 2020-11-02 /pmc/articles/PMC7820980/ /pubmed/32761935 http://dx.doi.org/10.1002/anie.202007412 Text en © 2020 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Articles
Zeiser, Clemens
Moretti, Luca
Lepple, Daniel
Cerullo, Giulio
Maiuri, Margherita
Broch, Katharina
Singlet Heterofission in Tetracene–Pentacene Thin‐Film Blends
title Singlet Heterofission in Tetracene–Pentacene Thin‐Film Blends
title_full Singlet Heterofission in Tetracene–Pentacene Thin‐Film Blends
title_fullStr Singlet Heterofission in Tetracene–Pentacene Thin‐Film Blends
title_full_unstemmed Singlet Heterofission in Tetracene–Pentacene Thin‐Film Blends
title_short Singlet Heterofission in Tetracene–Pentacene Thin‐Film Blends
title_sort singlet heterofission in tetracene–pentacene thin‐film blends
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7820980/
https://www.ncbi.nlm.nih.gov/pubmed/32761935
http://dx.doi.org/10.1002/anie.202007412
work_keys_str_mv AT zeiserclemens singletheterofissionintetracenepentacenethinfilmblends
AT morettiluca singletheterofissionintetracenepentacenethinfilmblends
AT leppledaniel singletheterofissionintetracenepentacenethinfilmblends
AT cerullogiulio singletheterofissionintetracenepentacenethinfilmblends
AT maiurimargherita singletheterofissionintetracenepentacenethinfilmblends
AT brochkatharina singletheterofissionintetracenepentacenethinfilmblends