Schedlbauer, Jakob and Scherf, Ullrich and Vogelsang, Jan and Lupton, John M. (2020) Dynamic Quenching of Triplet Excitons in Single Conjugated-Polymer Chains. JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 11 (13). pp. 5192-5198. ISSN 1948-7185,
Full text not available from this repository. (Request a copy)Abstract
By measuring the fluorescence photon statistics of single chains of a conjugated polymer, we determine the lifetime of the metastable dark state, the triplet exciton. The single molecule emits single photons one at a time, giving rise to photon antibunching. These photons appear bunched in time over longer time scales because of excursions to the triplet dark state. Remarkably, this triplet intermittency in the fluorescence is spontaneously suppressed over time scales of seconds, implying that either triplet formation is inhibited or that triplets are selectively quenched without the singlet fluorescence being affected. Such discrete switching in the strength of photon bunching is only seen in highly ordered and rigid chains of a ladder-type conjugated polymer. It does not occur in single dye molecules. We propose that trapped photogenerated charges on the chain selectively quench triplets but not singlets, presumably because the effective diffusion length of triplets is longer along the highly rigid ladder-type backbone.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM JUMPS; MAGNETIC-RESONANCE; ENERGY-TRANSFER; MOLECULES; FLUORESCENCE; EMITTERS; LIFETIME; |
| 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: | 18 Mar 2021 11:28 |
| Last Modified: | 18 Mar 2021 11:28 |
| URI: | https://pred.uni-regensburg.de/id/eprint/44246 |
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