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 and Victor I. Klimov ()
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Wan Ki Bae: Los Alamos National Laboratory
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
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

Nature Communications, 2013, vol. 4, issue 1, 1-8

Abstract: 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.

Date: 2013
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DOI: 10.1038/ncomms3661

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