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Proceedings Paper

Photoluminescence quantum yield of CdSe-ZnS/CdS/ZnS core-multishell quantum dots approaches 100% due to enhancement of charge carrier confinement
Author(s): Pavel Samokhvalov; Pavel Linkov; Jean Michel; Michael Molinari; Igor Nabiev
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Paper Abstract

Quantum dots (QDs) with the highest possible photoluminescence quantum yields are necessary for modern nanotechnology applications to biosensing and optoelectronics. To date, core-shell QDs are the best. We suggest and demonstrate a novel approach to enhancement of charge-carrier confinement in the core of CdSe QDs by creating a ZnS/CdS/ZnS shell with staggered potential barrier. The CdS interlayer breaks the ZnS-shell structure continuity, which allows combining the benefits of a single ZnS-monolayer inner shell, creating the highest possible confinement potential, with a sufficient overall shell thickness and suitability for common surface modification techniques. This approach allows the preparation of CdSe-ZnS/CdS/ZnS QDs with photoluminescence quantum yields approaching 100% and small photoluminescence peak width.

Paper Details

Date Published: 24 March 2014
PDF: 7 pages
Proc. SPIE 8955, Colloidal Nanoparticles for Biomedical Applications IX, 89550S (24 March 2014); doi: 10.1117/12.2040196
Show Author Affiliations
Pavel Samokhvalov, National Research Nuclear Univ. MEPhI (Russian Federation)
Pavel Linkov, National Research Nuclear Univ. MEPhI (Russian Federation)
Jean Michel, Univ. de Reims Champagne-Ardenne (France)
Michael Molinari, Univ. de Reims Champagne-Ardenne (France)
Igor Nabiev, National Research Nuclear Univ. MEPhI (Russian Federation)
Univ. de Reims Champagne-Ardenne (France)

Published in SPIE Proceedings Vol. 8955:
Colloidal Nanoparticles for Biomedical Applications IX
Wolfgang J. Parak; Marek Osinski; Kenji I. Yamamoto, Editor(s)

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