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

Author

Listed:
  • Christophe Galland

    (Los Alamos National Laboratory
    Center for Advanced Solar Photophysics, 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
    Center for Advanced Solar Photophysics, Los Alamos National Laboratory)

  • Han Htoon

    (Los Alamos National Laboratory
    Center for Advanced Solar Photophysics, Los Alamos National Laboratory
    Materials Physics & Applications: Center for Integrated Nanotechnologies, Los Alamos National Laboratory)

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.

Suggested Citation

  • Christophe Galland & Yagnaseni Ghosh & Andrea Steinbrück & Milan Sykora & Jennifer A. Hollingsworth & Victor I. Klimov & Han Htoon, 2011. "Two types of luminescence blinking revealed by spectroelectrochemistry of single quantum dots," Nature, Nature, vol. 479(7372), pages 203-207, November.
    • Handle: RePEc:nat:nature:v:479:y:2011:i:7372:d:10.1038_nature10569
    DOI: 10.1038/nature10569
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    Cited by:

    1. Hayeon Baek & Sungsu Kang & Junyoung Heo & Soonmi Choi & Ran Kim & Kihyun Kim & Nari Ahn & Yeo-Geon Yoon & Taekjoon Lee & Jae Bok Chang & Kyung Sig Lee & Young-Gil Park & Jungwon Park, 2024. "Insights into structural defect formation in individual InP/ZnSe/ZnS quantum dots under UV oxidation," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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