Dielectric switching of the nature of excited singlet state in a donor-acceptor-type polyfluorene copolymer

Annamaria Petrozza, Frederic Laquai, Ian A. Howard, Ji Seon Kim*, Richard H. Friend

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The spectral evolution of an intrachain neutral singlet exciton toward a charge-transfer (CT) state in solvents of increasing polarity has been monitored by time-resolved photoluminescence and ultrafast transient-absorption spectroscopy in a model conjugated random copolymer composed of electron donor and electron acceptor units. In polar solvents, a charge-like absorption superimposes the region of stimulated emission and leads to a dramatic reduction in gain implying that CT states can be detrimental for light amplification and lasing.

Original languageEnglish (US)
Article number205421
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number20
DOIs
StatePublished - May 12 2010

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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