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Pressure-induced delocalization of photoexcited states in a semiconducting polymer.

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. Green open access

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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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