Electroabsorption in poly(paraphenylene vinylene) and PtI: Exciton vs band descriptions

Z. Shuai*, D. Beljonne, Jean-Luc Bredas, A. Saxena, A. R. Bishop

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We contrast the electroabsorption (EA) spectra calculated within an exciton model (Pariser-Parr-Pople Hamiltonian) with that in a band description. The former model combined with small lattice relaxation of excited states is found to give a very good EA description for poly(paraphenylene vinylene) (PPV). A band picture gives qualitatively different EA behavior. As an illustration, we consider a two-band charge-density-wave model, for which we find three kinds of linewidth broadening behavior: (1) For weak fields, the broadening decreases with electric field; (2) for intermediate field strength, the broadening is dominated by damping effects and is independent of the field; (3) for strong fields the traditional Franz-Keldysh law holds. The EA spectrum calculated using the two-band model is in very good agreement with experiments on PtI, a halogen-bridged mixed-valence metal linear-chain complex.

Original languageEnglish (US)
Pages (from-to)1063-1067
Number of pages5
JournalSolid State Communications
Volume97
Issue number12
DOIs
StatePublished - Jan 1 1996

Keywords

  • A. organic crystals
  • D. optical properties

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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