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

By W. Bae, Young‐Shin Park, Jaehoon Lim, Donggu Lee, L. Padilha, Hunter McDaniel, I. Robel, Changhee Lee, J. Pietryga, V. Klimov. Nature Communications, 2013

658 citations recorded by the source corpus.

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. Auger recombination is a loss process that considerably reduces the efficiency of many quantum-dot light-emitting diodes. Here the authors demonstrate that designs such as heterostructure quantum dots can considerably suppress Auger decay in light-emitting diodes.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/b305fca232795cff14556957c14bc8718db498b0

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Citations in the corpus

Metal halide perovskites for light-emitting diodes (2020, positive): “It has been reported that Auger recombination can result in significant efficiency roll-off at high current densities in LEDs 37 .”
Prospects of nanoscience with nanocrystals. (2015, positive): “threshold current of efficiency rolloff (Figure 12c,d).(361) These studies”