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  • Ruseckas, A, et al. (author)
  • Ultrafast depolarization of the fluorescence in a conjugated polymer
  • 2005
  • In: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 72:11, s. 1-115214
  • Journal article (peer-reviewed)abstract
    • The effect of the extent of electron conjugation on the primary photophysics in semiconducting polymers is reported. A rapid depolarization of photoluminescence and transient absorption, which indicates a reorientation of the transition dipole moment by ~30° on a sub-100 fs time scale, is observed in the fully conjugated polymer poly[2-(2'-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] (MEH-PPV). In contrast, partially conjugated polymers exhibit a much slower depolarization. The results reveal rapid changes of exciton delocalization in the fully conjugated MEH-PPV driven by structural relaxation.
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