Robust singlet fission in pentacene thin films with tuned charge transfer interactions
Singlet fission, the spin-allowed photophysical process converting an excited singlet state into two triplet states, has attracted significant attention for device applications. Research so far has focused mainly on the understanding of singlet fission in pure materials, yet blends offer the promise...
Autores principales: | , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5838205/ https://www.ncbi.nlm.nih.gov/pubmed/29507287 http://dx.doi.org/10.1038/s41467-018-03300-1 |
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author | Broch, K. Dieterle, J. Branchi, F. Hestand, N. J. Olivier, Y. Tamura, H. Cruz, C. Nichols, V. M. Hinderhofer, A. Beljonne, D. Spano, F. C. Cerullo, G. Bardeen, C. J. Schreiber, F. |
author_facet | Broch, K. Dieterle, J. Branchi, F. Hestand, N. J. Olivier, Y. Tamura, H. Cruz, C. Nichols, V. M. Hinderhofer, A. Beljonne, D. Spano, F. C. Cerullo, G. Bardeen, C. J. Schreiber, F. |
author_sort | Broch, K. |
collection | PubMed |
description | Singlet fission, the spin-allowed photophysical process converting an excited singlet state into two triplet states, has attracted significant attention for device applications. Research so far has focused mainly on the understanding of singlet fission in pure materials, yet blends offer the promise of a controlled tuning of intermolecular interactions, impacting singlet fission efficiencies. Here we report a study of singlet fission in mixtures of pentacene with weakly interacting spacer molecules. Comparison of experimentally determined stationary optical properties and theoretical calculations indicates a reduction of charge-transfer interactions between pentacene molecules with increasing spacer molecule fraction. Theory predicts that the reduced interactions slow down singlet fission in these blends, but surprisingly we find that singlet fission occurs on a timescale comparable to that in pure crystalline pentacene. We explain the observed robustness of singlet fission in such mixed films by a mechanism of exciton diffusion to hot spots with closer intermolecular spacings. |
format | Online Article Text |
id | pubmed-5838205 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-58382052018-03-08 Robust singlet fission in pentacene thin films with tuned charge transfer interactions Broch, K. Dieterle, J. Branchi, F. Hestand, N. J. Olivier, Y. Tamura, H. Cruz, C. Nichols, V. M. Hinderhofer, A. Beljonne, D. Spano, F. C. Cerullo, G. Bardeen, C. J. Schreiber, F. Nat Commun Article Singlet fission, the spin-allowed photophysical process converting an excited singlet state into two triplet states, has attracted significant attention for device applications. Research so far has focused mainly on the understanding of singlet fission in pure materials, yet blends offer the promise of a controlled tuning of intermolecular interactions, impacting singlet fission efficiencies. Here we report a study of singlet fission in mixtures of pentacene with weakly interacting spacer molecules. Comparison of experimentally determined stationary optical properties and theoretical calculations indicates a reduction of charge-transfer interactions between pentacene molecules with increasing spacer molecule fraction. Theory predicts that the reduced interactions slow down singlet fission in these blends, but surprisingly we find that singlet fission occurs on a timescale comparable to that in pure crystalline pentacene. We explain the observed robustness of singlet fission in such mixed films by a mechanism of exciton diffusion to hot spots with closer intermolecular spacings. Nature Publishing Group UK 2018-03-05 /pmc/articles/PMC5838205/ /pubmed/29507287 http://dx.doi.org/10.1038/s41467-018-03300-1 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Broch, K. Dieterle, J. Branchi, F. Hestand, N. J. Olivier, Y. Tamura, H. Cruz, C. Nichols, V. M. Hinderhofer, A. Beljonne, D. Spano, F. C. Cerullo, G. Bardeen, C. J. Schreiber, F. Robust singlet fission in pentacene thin films with tuned charge transfer interactions |
title | Robust singlet fission in pentacene thin films with tuned charge transfer interactions |
title_full | Robust singlet fission in pentacene thin films with tuned charge transfer interactions |
title_fullStr | Robust singlet fission in pentacene thin films with tuned charge transfer interactions |
title_full_unstemmed | Robust singlet fission in pentacene thin films with tuned charge transfer interactions |
title_short | Robust singlet fission in pentacene thin films with tuned charge transfer interactions |
title_sort | robust singlet fission in pentacene thin films with tuned charge transfer interactions |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5838205/ https://www.ncbi.nlm.nih.gov/pubmed/29507287 http://dx.doi.org/10.1038/s41467-018-03300-1 |
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