Two types of luminescence blinking revealed by spectroelectrochemistry of single quantum dots

Christophe Galland, Yagnaseni Ghosh, Andrea Steinbrück, Milan Sykora (), Jennifer A. Hollingsworth, Victor I. Klimov () and Han Htoon ()
Additional contact information
Christophe Galland: Los Alamos National Laboratory
Yagnaseni Ghosh: Materials Physics & Applications: Center for Integrated Nanotechnologies, Los Alamos National Laboratory
Andrea Steinbrück: Materials Physics & Applications: Center for Integrated Nanotechnologies, Los Alamos National Laboratory
Milan Sykora: Los Alamos National Laboratory
Jennifer A. Hollingsworth: Materials Physics & Applications: Center for Integrated Nanotechnologies, Los Alamos National Laboratory
Victor I. Klimov: Los Alamos National Laboratory
Han Htoon: Los Alamos National Laboratory

Nature, 2011, vol. 479, issue 7372, 203-207

Abstract: Blinking mechanism revealed The phenomenon of fluorescence intermittency (blinking between ON/OFF states) has been observed for both naturally occurring fluorophores (such as organic dyes and biomolecules) and artificial nanostructures (such as carbon nanotubes and semiconducting nanocrystal quantum dots). This study aims to resolve the long-standing controversy surrounding the origin of photoluminescent blinking in semiconductor nanocrystals, also known as quantum dots. Researchers usually evoke the Auger, or A-type, mechanism in which a separation of charges yields to the OFF state, but recent observations have raised doubts about this explanation. Galland et al. describe a second mechanism (called B-type) in which an excited, or hot, electron becomes trapped in the shell for a time before being released to the emitting core. By controlling various parameters, such as applied voltage potential and shell thickness, the authors can control the frequency of blinking, or suppress it completely.

Date: 2011
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DOI: 10.1038/nature10569

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