Pressure-induced delocalization of photoexcited states in a semiconducting polymer

Sebastian Albert-Seifried*, Justin M. Hodgkiss, Frédéric Laquai, Hugo A. Bronstein, Charlotte K. Williams, Richard H. Friend

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

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.

Original languageEnglish (US)
Article number195501
JournalPhysical Review Letters
Volume105
Issue number19
DOIs
StatePublished - Nov 2 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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