Excited state spectral and dynamics studies of MEH-PPV

A. Dogariu, D. Vacar, A. J. Heeger

Research output: Contribution to journalConference article

3 Scopus citations

Abstract

Femtosecond spectroscopy studies of several thin conjugated polymer films and solutions were performed in order to examine the gain/loss in the excited state. The excited state shows bimolecular interaction at distances higher than 10 nm between excitations. The ultrafast dynamics are consistent with bimolecular dipole-dipole interaction, but a quantum delocalization of at least 5 nm has to be assumed. We show how the photoinduced absorption affects the emission of light in long as opposed to short (thin film) optical path configurations: the photoluminescence from thick sample spectrally overlaps the net gain (stimulated emission minus photoinduced absorption). The results show that the observed spectral narrowing occurs through amplified spontaneous emission.

Original languageEnglish (US)
Pages (from-to)202-203
Number of pages2
JournalSynthetic Metals
Volume101
Issue number1
DOIs
StatePublished - May 1999
Externally publishedYes
EventProceedings of the 1998 International Conference on Science and Technology of Synthetic Metals (ICSM-98) - Montpellier
Duration: Jul 12 1998Jul 18 1998

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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