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Singlet Fission, Polaron Generation and Intersystem Crossing in Hexaphenyl Film

The ultrafast dynamics of triplet excitons and polarons in hexaphenyl film was investigated by time-resolved fluorescence and femtosecond transient absorption techniques under various excitation photon energies. Two distinct pathways of triplet formation were clearly observed. Long-lived triplet sta...

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Autores principales: Ni, Wenjun, Li, Tianjiao, Kloc, Christian, Sun, Licheng, Gurzadyan, Gagik G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9412266/
https://www.ncbi.nlm.nih.gov/pubmed/36014308
http://dx.doi.org/10.3390/molecules27165067
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author Ni, Wenjun
Li, Tianjiao
Kloc, Christian
Sun, Licheng
Gurzadyan, Gagik G.
author_facet Ni, Wenjun
Li, Tianjiao
Kloc, Christian
Sun, Licheng
Gurzadyan, Gagik G.
author_sort Ni, Wenjun
collection PubMed
description The ultrafast dynamics of triplet excitons and polarons in hexaphenyl film was investigated by time-resolved fluorescence and femtosecond transient absorption techniques under various excitation photon energies. Two distinct pathways of triplet formation were clearly observed. Long-lived triplet states are populated within 4.5 ps via singlet fission-intersystem crossing, while the short-lived triplet states (1.5 ns) are generated via singlet fission from vibrational electronic states. In the meantime, polarons were formed from hot excitons on a timescale of <30 fs and recombined in ultrafast lifetime (0.37 ps). In addition, the characterization of hexaphenyl film suggests the morphologies of crystal and aggregate to wide applications in organic electronic devices. The present study provides a universally applicable film fabrication in hexaphenyl system towards future singlet fission-based solar cells.
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spelling pubmed-94122662022-08-27 Singlet Fission, Polaron Generation and Intersystem Crossing in Hexaphenyl Film Ni, Wenjun Li, Tianjiao Kloc, Christian Sun, Licheng Gurzadyan, Gagik G. Molecules Article The ultrafast dynamics of triplet excitons and polarons in hexaphenyl film was investigated by time-resolved fluorescence and femtosecond transient absorption techniques under various excitation photon energies. Two distinct pathways of triplet formation were clearly observed. Long-lived triplet states are populated within 4.5 ps via singlet fission-intersystem crossing, while the short-lived triplet states (1.5 ns) are generated via singlet fission from vibrational electronic states. In the meantime, polarons were formed from hot excitons on a timescale of <30 fs and recombined in ultrafast lifetime (0.37 ps). In addition, the characterization of hexaphenyl film suggests the morphologies of crystal and aggregate to wide applications in organic electronic devices. The present study provides a universally applicable film fabrication in hexaphenyl system towards future singlet fission-based solar cells. MDPI 2022-08-09 /pmc/articles/PMC9412266/ /pubmed/36014308 http://dx.doi.org/10.3390/molecules27165067 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ni, Wenjun
Li, Tianjiao
Kloc, Christian
Sun, Licheng
Gurzadyan, Gagik G.
Singlet Fission, Polaron Generation and Intersystem Crossing in Hexaphenyl Film
title Singlet Fission, Polaron Generation and Intersystem Crossing in Hexaphenyl Film
title_full Singlet Fission, Polaron Generation and Intersystem Crossing in Hexaphenyl Film
title_fullStr Singlet Fission, Polaron Generation and Intersystem Crossing in Hexaphenyl Film
title_full_unstemmed Singlet Fission, Polaron Generation and Intersystem Crossing in Hexaphenyl Film
title_short Singlet Fission, Polaron Generation and Intersystem Crossing in Hexaphenyl Film
title_sort singlet fission, polaron generation and intersystem crossing in hexaphenyl film
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9412266/
https://www.ncbi.nlm.nih.gov/pubmed/36014308
http://dx.doi.org/10.3390/molecules27165067
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