Influence of the degree of conjugation on excited state lifetimes in phenylene-based materials

U. Rant, U. Scherf, M. Rehahn, P. Galda, J. L. Brédas, E. Zojer

Research output: Contribution to journalConference articlepeer-review

11 Scopus citations


Phenylene-based materials are of particular interest for applications in organic luminescent devices. To gain deeper insight into the emissive properties of this class of materials, we have systematically studied the relation between the degree of conjugation and singlet exciton lifetimes. Two classes of phenylenes are investigated by time resolved frequency domain spectroscopy: oligo-para-phenylenes (OPPs) with n-alkyl substitutions at the central phenylene ring of the molecule and ladder-type-oligo-para-phenylenes (LOPPs) featuring rigid backbones with fixed interring twist angles. Additional quantum yield (QY) measurements allow to assess the intrinsic lifetime of the radiative decay. The experimental data are compared to the results of quantum-chemical calculations yielding an excellent agreement for both the classes of materials.

Original languageEnglish (US)
Pages (from-to)241-245
Number of pages5
JournalSynthetic Metals
Issue number1-3
StatePublished - Mar 26 2002
Externally publishedYes
EventNovel Organic Material and Technological Advances for Photonic E-MRS 2001 - Strasbourg, France
Duration: Jun 5 2001Jun 8 2001


  • Dipole moment
  • Frequency domain spectroscopy
  • Lifetime
  • Oligo phenylene
  • Quantum yield

ASJC Scopus subject areas

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


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