title: Blinking suppression and intensity recurrences in single CdSe-oligo(phenylene vinylene) nanostructures: experiment and kinetic model.
abstract: We report time-resolved single molecule fluorescence imaging of individual CdSe quantum dots that are functionalized with oligomeric conjugated organic ligands. The fluorescence intensity trajectories from these composite nanostructures display both a strong degree of blinking suppression and intensity fluctuations with characteristic recurrence times on the order of 10-60 s. In addition, fluorescence decay rate measurements of individual hybrid nanostructures indicate significantly modified non-radiative quantum dot decay rates relative to conventional ZnS-capped CdSe quantum dots. We show that a modified diffusive reaction coordinate model with slow fluctuations in quantum dot electron energies (1S(e), 1P(e)) can reproduce the experimentally observed behaviour.
authors: George H Richason, Jr Chemistry Research Laboratory, Department of Chemistry, University of Massachusetts, Amherst, MA 01003, USA.
authors: K T
authors: KT
authors: Early
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authors: McCarthy
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authors: Hammer
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authors: Tangirala
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authors: Emrick
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authors: Barnes