Hofmann, Felix J. and Vogelsang, Jan and Lupton, John M. (2016) Impact of charge carrier injection on single-chain photophysics of conjugated polymers. APPLIED PHYSICS LETTERS, 108 (26): 263301. ISSN 0003-6951, 1077-3118
Full text not available from this repository. (Request a copy)Abstract
Charges in conjugated polymer materials have a strong impact on the photophysics and their interaction with the primary excited state species has to be taken into account in understanding device properties. Here, we employ single-molecule spectroscopy to unravel the influence of charges on several photoluminescence (PL) observables. The charges are injected either stochastically by a photochemical process or deterministically in a hole-injection sandwich device configuration. We find that upon charge injection, besides a blue-shift of the PL emission and a shortening of the PL lifetime due to quenching and blocking of the lowest-energy chromophores, the non-classical photon arrival time distribution of the multichromophoric chain is modified towards a more classical distribution. Surprisingly, the fidelity of photon antibunching deteriorates upon charging, whereas one would actually expect the opposite: the number of chromophores to be reduced. A qualitative model is presented to explain the observed PL changes. The results are of interest to developing a microscopic understanding of the intrinsic charge-exciton quenching interaction in devices. Published by AIP Publishing.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRONIC-ENERGY TRANSFER; MOLECULE FLUORESCENCE; PHOTON STATISTICS; ROOM-TEMPERATURE; SPECTROSCOPY; DYNAMICS; EXCITONS; DEVICES; FIELD; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Apr 2019 11:06 |
| Last Modified: | 04 Apr 2019 11:06 |
| URI: | https://pred.uni-regensburg.de/id/eprint/3747 |
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