Special Papers

Journal of Fluorescence

, Volume 8, Issue 1, pp 37-44

Electronic deactivation and energy transfer in doped oligophenylenevinylene nanoparticles

  • J. GierschnerAffiliated withInstitut für Physikalische und Theoretische Chemie, UniversitÄt Tübingen
  • , H.-J. EgelhaafAffiliated withInstitut für Physikalische und Theoretische Chemie, UniversitÄt Tübingen
  • , D. OelkrugAffiliated withInstitut für Physikalische und Theoretische Chemie, UniversitÄt Tübingen
  • , K. MüllenAffiliated withMax-Planck-Institut für Polymerforschung

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Abstract

Suspensions of oligophenylenevinylene (nPV) nanoparticles withn = 2 vinylene units are doped with nPVs of longer chainlengths,n = 3–5. Absorption and fluorescence spectroscopy and steady-state and time-resolved fluorescence anisotropy measurements are used to determine the photo-physical properties of the suspensions. Undoped nanoparticles form highly oriented H-aggregates with low fluorescence quantum yields (ΦF ≈ 0.1). Introduction of bulky substituents into the particle constituting molecules perturbs the intermolecular orientation. Upon doping, efficient energy transfer to the dopants is found, changing the color and leading to enhancement of the fluorescence quantum yields up to ΦF = 0.6. The intermolecular orientation is not changed upon doping.

Key words

Oligo(phenylenevinylene) films nanoparticles energy transfer time-resolved fluorescence anisotropy