Cited by 39Organic Electronics and PhotovoltaicsPhotochemistry and Electron Transfer StudiesOrganic Light-Emitting Diodes Research

Twist Angle Plays an Important Role in Photophysical Properties of a Donor–Acceptor-Type Conjugated Polymer: A Combined Ensemble and Single-Molecule Study

Habuchi, Satoshi, Fujita, Hiroyuki, Michinobu, Tsuyoshi, Vacha, Martin·2011·The Journal of Physical Chemistry B

Abstract

We investigated photophysical properties of a donor-acceptor-type conjugated polymer by means of ensemble and single-molecule spectroscopy as well as density functional theory (DFT) calculation. The polymer is based on an alkyne-linked 1,8-carbazole (Cz) and possesses a benzothiadiazole (BT) as an electron acceptor moiety. A comparison with model compounds demonstrated that the dimer structure is the spectroscopic unit of the polymer. Single-molecule two-color excitation fluorescence and fluorescence lifetime experiments showed that the polymer molecules displayed broad distributions of fluorescence intensity ratio and fluorescence lifetime. Together with the DFT calculation, we demonstrated that the twist angle between the Cz and BT moieties played a central role in deciding those spectroscopic properties of the polymer. This result was further supported by single-molecule fluorescence spectral measurement. The spectral measurement also suggested intersegment interactions within the single chains. Furthermore, single-molecule defocused and polarization fluorescence imaging suggested efficient exciton migration and trapping occurring within the single polymer chain. These experiments also revealed changes of the lowest energy site within the single polymer molecules.

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Crossref · 10.1021/jp209405k

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Authors
Habuchi, S., Fujita, H., Michinobu, T., & Vacha, M.
Affiliations
  • Tokyo Institute of Technology (JP)
  • Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
Corresponding author
Habuchi, Satoshi
Venue
The Journal of Physical Chemistry B
Published
2011-11-16
Volume
115
Issue
49
Pages
14404-14415
ISSN
  • 1520-5207 (ISSN-L)
  • 1520-6106
OpenAlex
W2329617519
Cited by
39
References
88
Citations by year
2026: 2 · 2025: 1 · 2024: 1 · 2023: 2 · 2022: 3 · 2021: 2 · 2020: 2 · 2019: 5 · 2018: 3 · 2017: 2 · 2016: 3 · 2015: 2 · 2014: 2 · 2013: 4 · 2012: 5
FWCI
2.46
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Physical Chemistry B (publishedVersion)
  • PubMed (publishedVersion)
  • Tokyo Tech Research Repository (Tokyo Institute of Technology) (submittedVersion)
Funders
Japan Society for the Promotion of Science (20340109, 22750122)
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Electronics and Photovoltaics
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Light-Emitting Diodes Research
Keywords
donor-acceptor polymers, twist angle, benzothiadiazole, dimer structure, fluorescence lifetime distribution, fluorescence intensity ratio, exciton migration, exciton trapping, single-molecule fluorescence

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