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Synthèse et caractérisation de nanocristaux colloïdaux de semiconducteurs II-VI à structure coeur/coque. Contrôle de la cristallinité et des propriétés d'émission.

Abstract : We have developed synthesis protocols of core/shell semiconductors nanocrystals in CdSe/CdS and CdSe/CdS/ZnS. The perfectly crystalline shell improve the fluorescence properties of the nanocrystals as well as their resistance to environment modifications. We have shown that the crystal structure can be choose and controlled during synthesis by a judicious choice of the surface ligands. Moreover, we show that the fluorescence blinking of such nanocrystals can be strongly reduced or even suppressed if we synthesize core/shell CdSe/CdS nanocrystals with a sufficiently thick CdS shell. These objects are studied in single particle experiments. Fluorescence and lifetime measurements allow us to identify the blinking reduction mechanism. The nature and thickness of the shell induce a significant increase of the Auger lifetime, leading to a suppression of the dark state. Finally, CdSe/CdS/ZnS nanocrystals are used to develop fluorescent and transparent composite materials (polymer or sol-gel) exhibiting a high refractive index.
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https://pastel.archives-ouvertes.fr/pastel-00534683
Contributor : Benoit Mahler <>
Submitted on : Wednesday, November 10, 2010 - 12:08:23 PM
Last modification on : Wednesday, October 14, 2020 - 3:42:56 AM
Long-term archiving on: : Friday, December 2, 2016 - 9:57:43 AM

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  • HAL Id : pastel-00534683, version 1

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Benoit Mahler. Synthèse et caractérisation de nanocristaux colloïdaux de semiconducteurs II-VI à structure coeur/coque. Contrôle de la cristallinité et des propriétés d'émission.. Matériaux. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨pastel-00534683⟩

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