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

19 Scopus citations


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
Issue number19
StatePublished - Nov 2 2010
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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