Discrete Intensity Jumps and Intramolecular Electronic Energy Transfer in the Spectroscopy of Single Conjugated Polymer Molecules
Abstract
Single - molecule fluorescence spectroscopy of a multichromophoric conjugated polymer (molecular weight ∼20,000) revealed surprising single-step photobleaching kinetics and acute jumps in fluorescence intensity. These jumps were shown not to result from spectral diffusion and were attributed to fluctuations in the quantum yield of emission for the molecules. The data indicate efficient intramolecular electronic energy transfer along the polymer chain to a localized fluorescence-quenching polymer defect. The defects are created by reversible photochemistry of the polymer. These findings have implications for the use of conjugated polymers in light-emitting diode displays and sensors.
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Single-molecule fluorescence spectroscopy experiments on a poly(phenylenevinylene) derivative revealed that only a small number of chromophores emit fluorescence, although each CP chain contains more than a hundred chromophores.
“Single-molecule fluorescence spectroscopy experiments on a poly(phenylenevinylene) derivative revealed that only a small number of chromophores emit fluorescence, although each CP chain contains more than a hundred chromophores.159”
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 [159]
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- Authors
- Bout, D. A. V., Yip, W.-T., Hu, D., Fu, D.-K., Swager, T. M., & Barbara, P. F.
- Affiliations
- University of Minnesota (US)
- D. A. Vanden Bout, W.-T. Yip, D. Hu, P. F. Barbara, Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.
- Corresponding author
- Barbara, Paul F.
- Venue
- Science
- Published
- 1997-08-22
- Volume
- 277
- Issue
- 5329
- Pages
- 1074-1077
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2069275401
- Cited by
- 521
- References
- 26
- Citations by year
- 2026: 3 · 2025: 8 · 2024: 4 · 2023: 11 · 2022: 5 · 2021: 15 · 2020: 14 · 2019: 10 · 2018: 13 · 2017: 12 · 2016: 26 · 2015: 19 · 2014: 19 · 2013: 7 · 2012: 20
- FWCI
- 14.41
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Science (publishedVersion)
- Topics
- Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Advanced Fluorescence Microscopy Techniques
- Physical Sciences › Materials Science › Materials Chemistry › Luminescence and Fluorescent Materials
- Keywords
- conjugated polymers, single-molecule fluorescence, photobleaching kinetics, polymer defects, fluorescence quenching, spectral diffusion, light-emitting diodes, sensors
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