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Bright White-Light Emission from Semiconductor Nanocrystals: by Chance and by Design

Authors

  • S. Sapra,

    1. Photonics and Optoelectronics Group, Physics Department and Center for Nanoscience (CeNS), Ludwig-Maximilians Universität München, Amalienstr. 54, 80799 Munich, Germany
    2. Current address: Physical Chemisty/Electrochemistry Group, Technische Universität Dresden, Bergstr. 66b, 01062 Dresden, Germany
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  • S. Mayilo,

    1. Photonics and Optoelectronics Group, Physics Department and Center for Nanoscience (CeNS), Ludwig-Maximilians Universität München, Amalienstr. 54, 80799 Munich, Germany
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  • T. A. Klar,

    1. Photonics and Optoelectronics Group, Physics Department and Center for Nanoscience (CeNS), Ludwig-Maximilians Universität München, Amalienstr. 54, 80799 Munich, Germany
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  • A. L. Rogach,

    1. Photonics and Optoelectronics Group, Physics Department and Center for Nanoscience (CeNS), Ludwig-Maximilians Universität München, Amalienstr. 54, 80799 Munich, Germany
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  • J. Feldmann

    1. Photonics and Optoelectronics Group, Physics Department and Center for Nanoscience (CeNS), Ludwig-Maximilians Universität München, Amalienstr. 54, 80799 Munich, Germany
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  • We acknowledge the financial support from Gottfried Wilhelm Leibniz Preis of the DFG and the Alexander von Humboldt foundation (to S.S.), and thank Anna Helfrich and Werner Stadler for excellent technical assistance. We are also grateful to Thomas Franzl, Robert Kraus, and Klaus Becker for fruitful discussions. Supporting Information is available online from Wiley InterScience or from the author.

Abstract

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The synthesis and characterization of two bright white-light-emitting semiconductor nanocrystal (NC)-based systems is reported. CdS NCs emit white light because of the presence of surface states over the entire range of the visible spectrum, whereas CdSe/ZnS/CdSe/ZnS core/shell/shell/shell NCs are designed to emit white light as a result of the combination of blue and orange emissions from the shell and the core, respectively (see figure).

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