Controlling the influence of Auger recombination on the performance of quantum-dot light-emitting diodes.
Controlling the influence of Auger recombination on the performance of quantum-dot light-emitting diodes.
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DOI：
10.1038/ncomms3661
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发表时间：
2013
影响因子：
16.6
通讯作者：
Klimov, Victor I.
中科院分区：
文献类型：
--
作者：
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.
基于胶体量子点的发光二极管（LED）的开发是由这些荧光团的吸引人的特性驱动的，例如光谱窄、可调谐发射和通过基于溶液的方法的容易加工性。目前改善LED性能的障碍是对诸如表面缺陷处的非辐射复合之类的外在因素与诸如多载流子俄歇复合或由于施加的电场引起的电子-空穴分离之类的内在过程的作用的不完全理解。在这里，我们解决这个问题的研究，相关的激发态动力学的结构工程量子点与它们的发光性能在LED。我们发现，由于量子点与额外的电子的显着充电，俄歇复合极大地影响了LED效率和高电流下的效率滚降的开始。此外，我们展示了两种具体的方法来缓解这个问题，使用异质结构的量子点，通过抑制俄歇衰变通过引入中间合金层，或通过使用一个额外的壳，阻止电子转移到量子点，以帮助平衡电子和空穴注入。 俄歇复合是一种损耗过程，它大大降低了许多量子点发光二极管的效率。在这里，作者证明了异质结构量子点等设计可以大大抑制发光二极管中的俄歇衰减。
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.
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影响因子：
3.7
作者：
Klimov, V. I.;McGuire, J. A.;Rupasov, V. I.
通讯作者：
Rupasov, V. I.
影响因子：
56.9
作者：
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Bawendi, MG
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作者：
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通讯作者：
Bulovic, Vladimir
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作者：
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通讯作者：
Wood, Vanessa
影响因子：
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作者：
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通讯作者：
Kim, Jong Min