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Controlling the influence of Auger recombination on the performance of quantum-dot light-emitting diodes

Author

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  • Wan Ki Bae

    (Los Alamos National Laboratory
    Photo-Electronic Hybrid Research Center, Korea Institute of Science and Technology)

  • Young-Shin Park

    (Los Alamos National Laboratory)

  • Jaehoon Lim

    (School of Electrical Engineering and Computer Science, Inter-university Semiconductor Research Center, Seoul National University)

  • Donggu Lee

    (School of Electrical Engineering and Computer Science, Inter-university Semiconductor Research Center, Seoul National University)

  • Lazaro A. Padilha

    (Los Alamos National Laboratory
    Instituto de Fisica “Gleb Wataghin”, Universidade Estadual de Campinas)

  • Hunter McDaniel

    (Los Alamos National Laboratory)

  • Istvan Robel

    (Los Alamos National Laboratory)

  • Changhee Lee

    (School of Electrical Engineering and Computer Science, Inter-university Semiconductor Research Center, Seoul National University)

  • Jeffrey M. Pietryga

    (Los Alamos National Laboratory)

  • Victor I. Klimov

    (Los Alamos National Laboratory)

Abstract

Development of light-emitting diodes (LEDs) based on colloidal quantum dots is driven by attractive properties of these fluorophores such as spectrally narrow, tunable emission and facile processibility via solution-based methods. A current obstacle towards improved LED performance is an incomplete understanding of the roles of extrinsic factors, such as non-radiative recombination at surface defects, versus intrinsic processes, such as multicarrier Auger recombination or electron-hole separation due to applied electric field. Here we address this problem with studies that correlate the excited state dynamics of structurally engineered quantum dots with their emissive performance within LEDs. We find that because of significant charging of quantum dots with extra electrons, Auger recombination greatly impacts both LED efficiency and the onset of efficiency roll-off at high currents. Further, we demonstrate two specific approaches for mitigating this problem using heterostructured quantum dots, either by suppressing Auger decay through the introduction of an intermediate alloyed layer, or by using an additional shell that impedes electron transfer into the quantum dot to help balance electron and hole injection.

Suggested Citation

  • Wan Ki Bae & Young-Shin Park & Jaehoon Lim & Donggu Lee & Lazaro A. Padilha & Hunter McDaniel & Istvan Robel & Changhee Lee & Jeffrey M. Pietryga & Victor I. Klimov, 2013. "Controlling the influence of Auger recombination on the performance of quantum-dot light-emitting diodes," Nature Communications, Nature, vol. 4(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3661
    DOI: 10.1038/ncomms3661
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