General Method for the Synthesis of Ultrastable Core/Shell Quantum Dots by Aluminum Doping

Semiconductor quantum dots (QDs) have attracted extensive attention in various applications because of their unique optical and electronic properties. However, long-term photostability remains a challenge for their practical application. Here, we present a simple method to enhance the photostability...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2015-10, Vol.137 (39), p.12430-12433
Main Authors: Li, Zhichun, Yao, Wei, Kong, Long, Zhao, Yixin, Li, Liang
Format: Article
Language:English
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Summary:Semiconductor quantum dots (QDs) have attracted extensive attention in various applications because of their unique optical and electronic properties. However, long-term photostability remains a challenge for their practical application. Here, we present a simple method to enhance the photostability of QDs against oxidation by doping aluminum into the shell of core/shell QDs. We demonstrate that Al in the coating shell can be oxidized to Al2O3, which can serve as a self-passivation layer on the surface of the core/shell QDs and effectively stop further photodegradation during long-term light irradiation. The prepared CdSe/CdS:Al QDs survived 24 h without significant degradation when they were subjected to intense illumination under LED light (450 nm, 0.35 W/cm2), whereas conventional CdSe/CdS QDs were bleached within 3 h.
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.5b05462