Photoluminescence anti-blinking of single CdZnSe/ZnSe nanocrystals

ORAL

Abstract

We have synthesized soft-confinement nanocrystals (NCs) of CdZnSe/ZnSe that on the single particle level exhibit complete elimination of photoluminescence (PL) blinking. These continuously emitting NCs have a very short PL decay lifetime of 5 ns. Moreover, single CdZnSe/ZnSe PL spectra are highly unusual with three distinct peaks. These unique and remarkable optical properties are collectively explained by the radiative recombination of a trion due to suppressed Auger processes in a NC. Upon deformation of the soft-confinement potential, the PL intensity of a single CdZnSe/ZnSe NC switches between two bright states, but still never turns off. Possible mechanisms for this PL anti-blinking behavior will be discussed.

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Authors

  • Xiaoyong Wang

    Department of Chemistry, University of Rochester

  • Xiaofan Ren

    Eastman Kodak Company

  • Keith Kahen

    Eastman Kodak Company

  • Megan Hahn

    Department of Chemistry, University of Rochester

  • Manju Rajeswaran

    Eastman Kodak Company

  • Sara Maccagnano-Zacher

    School of Applied and Engineering Physics, Cornell University

  • John Silcox

    School of Applied and Engineering Physics, Cornell University

  • George Cragg

    Naval Research Laboratory

  • Alexander Efros

    Naval Research Laboratory, Center for Computational Materials Science,Naval Research Laboratory, Washington DC 20375, Center for Computational Material Science, Naval Research Laboratory, Washington DC, USA

  • Todd Krauss

    Department of Chemistry, University of Rochester