Optical Spectroscopy of a Polyfluorene Copolymer at High Pressure: Intra- and Intermolecular Interactions

Johanna P. Schmidtke, Ji-Seon Kim, Johannes Gierschner, Carlos Silva, and Richard H. Friend
Phys. Rev. Lett. 99, 167401 – Published 19 October 2007

Abstract

We present optical spectroscopy studies of the conjugated polymer poly(9,9-di-n-octylfluorene-alt-benzothiadiazole) (F8BT) at high pressure. The photoluminescence spectrum of F8BT in a dilute solid-state solution in polystyrene redshifts by 320 meV over 7.4 GPa, while that of a F8BT thin film redshifts 460 meV over a comparable pressure range. We attribute the redshift in solution to intrachain pressure effects, principally conformational planarization. The additional contribution from interchain π-electron interactions accounts for the larger redshift of thin films.

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  • Received 8 March 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.167401

©2007 American Physical Society

Authors & Affiliations

Johanna P. Schmidtke1,*, Ji-Seon Kim1, Johannes Gierschner2, Carlos Silva3, and Richard H. Friend1

  • 1Cavendish Laboratory, University of Cambridge, J. J. Thompson Avenue, Cambridge CB3 0HE, United Kingdom
  • 2Laboratory for Chemistry of Novel Materials, Center for Research in Molecular Electronics and Photonics, University of Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium
  • 3Département de physique, Regroupement québécois sur les matériaux de pointe, Université de Montréal, C. P. 6128, Succ. centre-ville, Montréal, Québec H3C 3J7, Canada

  • *jpschmidtke@gmail.com

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Vol. 99, Iss. 16 — 19 October 2007

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