Optical spectra and excitations in phenylene vinylene oligomers

H. S. Woo, O. Lhost, S. C. Graham, D. D.C. Bradley, R. H. Friend, C. Quattrocchi, J. L. Brédas, R. Schenk, K. Müllen

Research output: Contribution to journalArticlepeer-review

169 Scopus citations

Abstract

Experimental results of optical absorption spectra, photoluminescence spectra due to singlet exciton emission and photoinduced absorption spectra due to triplet-triplet transitions of triplet excitons for several oligomers of poly(p-phenylene vinylene) are reported. From the red-shift of the peaks with increasing chain length, the effective conjugation length for long-chain precursor-route samples of the polymer are estimated to be about 10 to 17 repeat units. Theoretical studies, using the valence-effective Hamiltonian (VEH) technique, of the effects of ring torsions upon the electronic properties are also reported. Comparison between absorption and luminescence spectra in solution and in the solid state shows a blue-shift for the solution spectra; this is modelled in terms of a greater degree of ring torsion for these oligomers in solution. © 1993.
Original languageEnglish (US)
Pages (from-to)13-28
Number of pages16
JournalSynthetic Metals
Volume59
Issue number1
DOIs
StatePublished - Jan 1 1993
Externally publishedYes

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Optical spectra and excitations in phenylene vinylene oligomers'. Together they form a unique fingerprint.

Cite this