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

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

Research output: Contribution to journalArticle

362 Citations (Scopus)

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.

Original languageEnglish
Article number2661
JournalNature communications
Volume4
DOIs
Publication statusPublished - Dec 1 2013

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Bae, W. K., Park, Y. S., Lim, J., Lee, D., Padilha, L. A., McDaniel, H., Robel, I., Lee, C., Pietryga, J. M., & Klimov, V. I. (2013). Controlling the influence of Auger recombination on the performance of quantum-dot light-emitting diodes. Nature communications, 4, [2661]. https://doi.org/10.1038/ncomms3661