Femtosecond dynamics of excitons in π-conjugated oligomers: The role of intrachain two-exciton states in the formation of interchain species

Victor I Klimov, Duncan W. McBranch, Nikolay N. Barashkov, John P. Ferraris

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

We report femtosecond transient absorption results for solutions and thin films of a substituted oligomer of poly(paraphenylene vinylene) performed over wide spectral and pump-intensity ranges. Solutions and films exhibit a photoinduced absorption (PA) band with dynamics matching those of the stimulated emission, demonstrating unambiguously that these features originate from intrachain singlet excitons. Thin films exhibit an additional short-wavelength PA band with pump-independent dynamics, indicating the formation of non-emissive interchain excitons. Correlations in the dynamics of the two PA features, as well as the intensity-dependence, provide strong evidence that the formation of interchain excitons is mediated by intrachain two-exciton states.

Original languageEnglish
Pages (from-to)109-117
Number of pages9
JournalChemical Physics Letters
Volume277
Issue number1-3
Publication statusPublished - Oct 3 1997

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

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