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Coverage-mediated suppression of blinking in solid state quantum dot conjugated organic composite nanostructures
Nathan I Hammer1, Kevin T Early, Kevin Sill
1The George Richason, Jr. Chemistry Research Laboratory, Department of Chemistry, University of Massachusetts, Amherst, MA 01003, USA.
The Journal of Physical Chemistry. B
|July 21, 2006
Summary
Functionalizing cadmium selenide (CdSe) quantum dots with oligo(phenylene vinylene) (OPV) ligands suppresses blinking. This modification, driven by ligand coverage, opens new avenues for optoelectronic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Photophysics
Background:
- Quantum dots (QDs) exhibit fluorescence intermittency (blinking), limiting their application.
- Surface functionalization is a key strategy to control QD properties.
Purpose of the Study:
- To investigate the effect of oligo(phenylene vinylene) (OPV) ligand coverage on the fluorescence intermittency of CdSe quantum dots.
- To explore the potential of CdSe-OPV nanostructures in optoelectronic systems.
Main Methods:
- Single-molecule fluorescence measurements were performed on CdSe quantum dots with varying degrees of OPV ligand functionalization.
- Blinking statistics and fluorescence decay dynamics were analyzed as a function of ligand coverage and integration time.
Main Results:
- Complete suppression of blinking was observed for fully covered CdSe-OPV nanostructures (approx. 25 ligands) at a 1-second integration time.
- Partial blinking was observed on finer timescales (100 ms), with shorter dark-state persistence times compared to ZnS-capped QDs.
- Evidence suggests charge transfer from photoexcited OPV ligands to QD surface trap sites.
Conclusions:
- Ligand coverage significantly impacts QD blinking behavior, with full coverage effectively suppressing it.
- The observed blinking suppression is attributed to charge transport mechanisms involving the OPV ligands.
- CdSe-OPV composite systems show promise for advanced optoelectronic devices.
