Continuous distribution of emission states from single CdSe/ZnS quantum dots.
basic_science · Level V
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Abstract
The photoluminescence dynamics of colloidal CdSe/ZnS/streptavidin quantum dots were studied using time-resolved single-molecule spectroscopy. Statistical tests of the photon-counting data suggested that the simple "on/off" discrete state model is inconsistent with experimental results. Instead, a continuous emission state distribution model was found to be more appropriate. Autocorrelation analysis of lifetime and intensity fluctuations showed a nonlinear correlation between them. These results were consistent with the model that charged quantum dots were also emissive, and that time-dependent charge migration gave rise to the observed photoluminescence dynamics.
Medical subject headings
- Cadmium Compounds
- Luminescent Measurements
- Models, Chemical
- Quantum Dots
- Selenium Compounds
- Sulfides
- Zinc Compounds