Stangl, Thomas and Bange, Sebastian and Schmitz, Daniela and Wuersch, Dominik and Hoeger, Sigurd and Vogelsang, Jan and Lupton, John M. (2013) Temporal Switching of Homo-FRET Pathways in Single-Chromophore Dimer Models of pi-Conjugated Polymers. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 135 (1). pp. 78-81. ISSN 0002-7863,
Full text not available from this repository. (Request a copy)Abstract
A set of if-conjugated oligomer dimers templated in molecular scaffolds is presented as a model system for studying the interactions between chromophores in conjugated polymers (CPs). Single-molecule spectroscopy was used to reveal energy transfer dynamics between two oligomers in either a parallel or oblique-angle geometry. In particular, the conformation of single molecules embedded in a host matrix was investigated via polarized excitation and emission fluorescence microscopy in combination with fluorescence correlation spectroscopy. While the intramolecular interchromophore conformation was found to have no impact on the fluorescence quantum yield, lifetime, or photon statistics (antibunching), the long-term nonequilibrium dynamics of energy transfer within these bichromophoric systems was accessible by studying the linear dichroism in emission at the single-molecule level, which revealed reversible switching of the emission between the two oligomers. In bulk polymer films, interchromophore coupling promotes the migration of excitation energy to quenching sites. Realizing the presence and dynamics of such interactions is crucial for understanding limitations on the quantum efficiency of larger CP materials.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MOLECULE SPECTROSCOPY; ENERGY-TRANSFER; BIPHENYL; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Apr 2020 07:37 |
| Last Modified: | 28 Apr 2020 07:37 |
| URI: | https://pred.uni-regensburg.de/id/eprint/17295 |
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