Article | REF: RE233 V1

Non-blinking fluorescent nanocrystals : one step closer to the perfect fluorophore

Authors: Michel NASILOWSKI, Benoît DUBERTRET

Publication date: July 10, 2014

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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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AUTHORS

  • Michel NASILOWSKI: PhD student, University of Paris VI, LPEM/ESPCI, 10, rue Vauquelin, 75005 Paris, France

  • 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. . Since then, nanocrystals have been engineered: the band alignments of the various materials, the core/shell systems, etc., have all been designed and engineered. ... have made it possible to obtain materials with finely controllable physico-chemical properties, whose applications are now emerging on an industrial scale.

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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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Non-flashing fluorescent nanocrystals: towards the perfect fluorophore