Albert-Seifried, S;
Hodgkiss, JM;
Laquai, F;
Bronstein, HA;
Williams, CK;
Friend, RH;
(2010)
Pressure-induced delocalization of photoexcited states in a semiconducting polymer.
Physical Review Letters
, 105
(19)
, Article 195501. 10.1103/PhysRevLett.105.195501.
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Abstract
We present broadband transient absorption spectroscopy on the fluorescent copolymer poly(9,9-dioctylfluorene-co-benzothiadiazole) under hydrostatic pressure of up to 75 kbar. We observe a strong reduction of the stimulated emission intensity under pressure, coupled with slower decay kinetics and reduced fluorescence intensity. These observations indicate increased delocalization of photogenerated singlet excitons, facilitated by an increased dielectric constant at high pressure. Spin triplet excitons, generated via an iridium complex-F8BT oligomer, show reduced lifetimes under pressure.
| Type: | Article |
|---|---|
| Title: | Pressure-induced delocalization of photoexcited states in a semiconducting polymer. |
| Location: | US |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.105.195501 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.105.195501 |
| Language: | English |
| Additional information: | © 2010 The American Physical Society |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1392220 |
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