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Updated: Jun 5, 2026

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering
Published on: December 21, 2017
Pressure-induced delocalization of photoexcited states in a semiconducting polymer
Sebastian Albert-Seifried1, Justin M Hodgkiss, Frédéric Laquai
1Cavendish Laboratory, Department of Physics, University of Cambridge, CB3 0HE, United Kingdom. sa468@cam.ac.uk
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.
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