Wilhelm, Philipp and Vogelsang, Jan and Hoeger, Sigurd and Lupton, John M. (2019) Homo-FRET in pi-Conjugated Polygons: Intermediate-Strength Dipole-Dipole Coupling Makes Energy Transfer Reversible. NANO LETTERS, 19 (8). pp. 5483-5488. ISSN 1530-6984, 1530-6992
Full text not available from this repository. (Request a copy)Abstract
The concept of homo-FRET is often used to describe energy transfer between like chromophores of molecular aggregates such as in pi-conjugated polymers. Homo-FRET is revealed by a dynamic depolarization in fluorescence but strictly only applies to the limit of weak dipole-dipole coupling, where energy transfer occurs on time scales much longer than those of nuclear relaxation. By considering the polarization anisotropy of photoluminescence emission and excitation of model multichromophoric aggregates on the single-molecule level, we demonstrate the transition of energy-transfer dynamics from the case of weak coupling to that of strong coupling, revealing the elusive regime of intermediate-strength coupling where energy transfer between degenerate donor and acceptor chromophores becomes reversible so that information on the excitation route of the emitting chromophore is lost.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSFER PATHWAYS; CONFORMATION; POLYMER; Single-molecule spectroscopy; excitation energy transfer; dipole-dipole coupling; linear dichroism; pi-conjugated materials; organic electronics |
| 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: | 02 Apr 2020 04:32 |
| Last Modified: | 02 Apr 2020 04:32 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26522 |
Actions (login required)
 |
View Item |
