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首页> 外文期刊>RSC Advances >Enhancing the performance of blue quantum-dot light-emitting diodes through the incorporation of polyethylene glycol to passivate ZnO as an electron transport layer
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Enhancing the performance of blue quantum-dot light-emitting diodes through the incorporation of polyethylene glycol to passivate ZnO as an electron transport layer

机译：通过将聚乙二醇掺入钝化ZnO作为电子传输层来增强蓝量子点发光二极管的性能

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The balance between charge transport and charge injection is always a key factor in enhancing the performance of quantum-dot light-emitting diodes (QD-LEDs), particularly for the blue QDs due to their large optical band gap and relatively low valence band level compared with their green and red counterparts. High performance blue QD-LEDs have been demonstrated by blending polyethylene glycol (PEG) into solution-processed ZnO nanocrystals as the electron transport layer. PEG can effectively tune the electron mobility of ZnO and simultaneously passivate its surface defect states. As a result, the maximum current efficiency (CE) and external quantum efficiency (EQE) of the blue QD-LEDs increased from 4.33 cd A ~(?1) and 9.98% for pure ZnO to 8.03 cd A ~(?1) and 14.84% for 4% PEG blended into ZnO, respectively. Furthermore, operational lifetime of the device is also significantly improved from 8.95 h to 25.06 h. This result indicates that PEG is a promising material for regulating the charge balance of the blue QD-LEDs.
机译：电荷运输和电荷注入之间的平衡始终是增强量子点发光二极管（QD-LED）性能的关键因素，特别是对于它们的大光带隙而具有相对低的价带水平，对于蓝色QDS比较用他们的绿色和红色的同行。通过将聚乙二醇（PEG）混合到作为电子传输层的溶液加工的ZnO纳米晶体中来证明高性能蓝QD-LED。 PEG可以有效地调谐ZnO的电子迁移率并同时钝化其表面缺陷状态。结果，蓝色QD-LED的最大电流效率（CE）和外部量子效率（EQE）从4.33cd a〜（Δ1）和9.98％的纯ZnO至8.03cd a〜（？1）和将4％PEG分别混合到ZnO中的14.84％。此外，装置的操作寿命从8.95小时到25.06小时也显着提高。该结果表明，PEG是用于调节蓝QD-LED的电荷平衡的有希望的材料。

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