Energy transfer in a conjugated polymer with reduced inter-chain coupling

A Ruseckas, M Theander, L Valkunas, MR Andersson, O Inganas, Sundstrom

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66 Citations (Scopus)

Abstract

Energy transfer in spin-coated films and solutions of poly(dioctylphenylthiophene) with bulky side chains has been studied by femtosecond pump-probe spectroscopy, polarisation anisotropy and excitation annihilation. A red shift of stimulated emission spectra with time and a gradual decay of anisotropy are observed in him and solution and attributed to excitation migration towards lower-energy sites. At high-excitation intensities singlet-singlet annihilation with time-independent rate dominates the decay of excited-state population in the film for short times. It is concluded that energy migration in film, which results in effective excitation trapping and nonradiative decay, is a three-dimensional process, while in solution a one-dimensional intra-chain energy migration is much more limited. (C) 1998 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)474-477
Number of pages4
JournalJournal of Luminescence
Volume76-7
Publication statusPublished - Feb 1998
Event11th International Conference on Dynamical Processes in Excited States of Solids - MITTELBERG, Austria
Duration: 20 Jul 199724 Jul 1997

Keywords

  • energy transfer
  • conjugated polymers
  • EXCITON
  • POLY(3-OCTYLTHIOPHENE)
  • SPECTROSCOPY
  • ANNIHILATION
  • ABSORPTION
  • RELAXATION
  • DYNAMICS

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