Fluorescence Spectroscopy of Single Lead Sulfide Quantum Dots
Top Cited Papers
- 21 February 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 6 (3) , 510-514
- https://doi.org/10.1021/nl0525756
Abstract
We report the observation of fluorescence from single PbS quantum dots (QDs) using confocal microscopy in an inert atmosphere. Single PbS QDs exhibit a narrowing of the fluorescence line width (relative to the ensemble) and fluorescence intermittency (“blinking”), consistent with the properties of other single QDs. However, single-particle line widths averaged 100 meV, indicating a significant homogeneous component to the ensemble line width. In addition, the duration of an on/off blinking event has a probability density that decays according to an inverse power law, indicating a broad distribution of kinetic rates to multiple on/off states.Keywords
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