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Optica Publishing Group
  • Frontiers in Optics 2007/Laser Science XXIII/Organic Materials and Devices for Displays and Energy Conversion
  • OSA Technical Digest (CD) (Optica Publishing Group, 2007),
  • paper LTuL3
  • https://doi.org/10.1364/LS.2007.LTuL3

Probing Photophysics of Individual Quantum Dot/Organic Hybrid Nanostructures

Open Access Open Access


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 interesting intensity fluctuations with recurrence times on the order of 10-60 seconds (quantified by Fourier transform analysis). In addition, Time-Tagged-Time-Resolved (TTTR) fluorescence measurements of the fluorescence decay rate of individual hybrid nanostructures indicate significantly modified non-radiative decay rates relative to conventional ZnS-capped CdSe quantum dots. Modelling of fluorescence intensity trajectories using a diffusive reaction coordinate model shows that slow fluctuations in electron energies (1Se, 1Pe) can give rise to the recurrences via modified Auger-assisted hole-trapping rates. We briefly discuss a possible ligand-induced mechanism for this observed behavior.

© 2007 APS

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