Ultrafast depolarization of the fluorescence in a conjugated polymer

A Ruseckas, P Wood, I D W Samuel, G R Webster, W J Mitchell, P L Burn, V Sundstrom

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108 Citations (Scopus)

Abstract

The effect of the extent of pi 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 similar to 30 degrees 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.

Original languageEnglish
Number of pages5
JournalPhysical Review. B, Condensed matter and materials physics
Volume72
DOIs
Publication statusPublished - Sept 2005

Keywords

  • PHENYLENE VINYLENE OLIGOMERS
  • MEH-PPV
  • BROKEN CONJUGATION
  • OPTICAL-PROPERTIES
  • LOW-TEMPERATURE
  • ENERGY-TRANSFER
  • SPECTRA
  • ABSORPTION
  • SPECTROSCOPY
  • PHOTOPHYSICS

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