Bae, Wan Ki Park, Young-Shin Lim, Jaehoon Lee, Donggu Padilha, Lazaro A. McDaniel, Hunter Robel, Istvan Lee, Changhee Pietryga, Jeffrey M. Klimov, Victor I. 2024-01-20T11:31:36Z 2024-01-20T11:31:36Z 2021-09-05 2013-10 2041-1723 https://pubs.kist.re.kr/handle/201004/127612 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. English NATURE PUBLISHING GROUP SEMICONDUCTOR NANOCRYSTALS OPTICAL GAIN ELECTROLUMINESCENCE SUPPRESSION DEVICES Controlling the influence of Auger recombination on the performance of quantum-dot light-emitting diodes Article 10.1038/ncomms3661 1 NATURE COMMUNICATIONS, v.4 NATURE COMMUNICATIONS 4 scie scopus 000326473300002 2-s2.0-84892418299 Multidisciplinary Sciences Science & Technology - Other Topics Article SEMICONDUCTOR NANOCRYSTALS OPTICAL GAIN ELECTROLUMINESCENCE SUPPRESSION DEVICES Auger Recombination Efficiency Roll-Off Droop Quantum Dot Light-Emitting Diode Core/Shell *투고완료-Los Alamos National Lab.(USA) 소속일때