Overview
ABSTRACT
Fluorescent semiconductor nanocrystals (quantum dots-QDs) exhibit very interesting optical properties : no photobleaching of their fluorescence over time (even under continuous excitation), narrow spectral width, easily tunable emission wavelength according to their size and chemical composition. However, their use remains limited : at a single particle level, their fluorescence fluctuates with time (blinking). A new type of quantum dots has been synthesized, with a strongly reduced blinking. This article presents the mechanisms of fluorescence and blinking of QDs, the general methods of synthesis, and the study of non-blinking nanocrystals with 100 % quantum yield at low temperature.
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Read the articleAUTHORS
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Michel NASILOWSKI: PhD student, University of Paris VI, LPEM/ESPCI, 10, rue Vauquelin, 75005 Paris, France
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Benoît DUBERTRET: Research Director, CNRS, LPEM/ESPCI, 10, rue Vauquelin, 75005 Paris, France
INTRODUCTION
Box 1 – History
The scientific community has been interested in semiconductor nanocrystals for some thirty years. Since their discovery in the early 1980s by Ekimov and Henglein , and their theoretical study by Efros and Brus , the synthesis protocols were improved and, in 1993, the first synthesis of size-controlled colloidal semiconductor nanocrystals was achieved. . Since this key synthesis, the field has undergone significant development, particularly since 2000, when new precursors that are less hazardous for synthesis were developed.
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KEYWORDS
State of the art | single particle spectroscopy | synthesis of colloidal nanoparticles | luminophores in display devices | fluorescent markers for biomedical imaging | quantum dots | blinking | quantum yield
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