Single chain spectroscopy of conformational dependence of conjugated polymer photophysics
Open accessAbstract
Single molecule confocal fluorescence microscopy was used to perform photoluminescence spectroscopy on single, isolated molecules of the conjugated polymer poly[2-methoxy,5-(2′-ethyl-hexyloxy)- p -phenylene-vinylene] (MEH-PPV). We show that the fluorescence from single chains of this electroluminescent polymer depends strongly on chain conformation. The time evolution of the spectra, emission intensity, and polarization all provide direct evidence that memory of the chain conformation in solution is retained after solvent evaporation. Chains cast from toluene solution are highly folded and show memory of the excitation polarization. Exciton funneling to highly aggregated low energy regions causes the chain to mimic the photophysical behavior of a single chromophore. Chains cast from chloroform, however, behave as multichromophore systems, and no sudden discrete spectral or intensity jumps are observed. These also exhibit different spectroscopy from the folded chromophores.
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The efficiency of energy funneling and thus the number of chromophores and fluorescence brightness of CPs depend significantly on the conformational states of chromophores.
“The efficiency of energy funneling and thus the number of chromophores and fluorescence brightness of CPs depend significantly on the conformational states of chromophores.161−163”
From The Pursuit of Shortwave Infrared-Emitting Nanoparticles with Bright Fluorescence through Molecular Design and Excited-State Engineering of Molecular Aggregates (2022) · cites this paper as [162]
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- Authors
- Huser, T., Yan, M., & Rothberg, L. J.
- Affiliations
- Lawrence Livermore National Laboratory (US)
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2000-10-10
- Volume
- 97
- Issue
- 21
- Pages
- 11187-11191
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC17175
- OpenAlex
- W2051644553
- Cited by
- 322
- References
- 26
- Citations by year
- 2026: 4 · 2025: 6 · 2024: 1 · 2023: 6 · 2022: 3 · 2021: 3 · 2020: 8 · 2019: 12 · 2018: 6 · 2017: 12 · 2016: 12 · 2015: 9 · 2014: 11 · 2013: 12 · 2012: 11
- FWCI
- 17.30
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- PUB – Publications at Bielefeld University (Bielefeld University) (submittedVersion)
- Publikationen an der Universität Bielefeld (Universität Bielefeld) (submittedVersion)
- Funders
- U.S. Department of Energy (W-7405, W‐7405‐ENG‐48)
- University of Connecticut
- University of Rochester
- National Taiwan University
- Laboratory Directed Research and Development
- Lawrence Livermore National Laboratory
- 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
- MEH-PPV, conjugated polymers, single-molecule fluorescence, chain conformation, photoluminescence, exciton funneling, solvent evaporation, chromophore aggregation, excitation polarization, electroluminescent polymers, polymer thin films
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