Electronic deactivation and energy transfer in doped oligophenylenevinylene nanoparticles
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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 wordsOligo(phenylenevinylene) films nanoparticles energy transfer time-resolved fluorescence anisotropy
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