Performance Enhancement of InP Quantum Dot Light-Emitting Diodes via a Surface-Functionalized ZnMgO Electron Transport Layer,ACS Energy Letters

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Performance Enhancement of InP Quantum Dot Light-Emitting Diodes via a Surface-Functionalized ZnMgO Electron Transport Layer
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-06-08 , DOI: 10.1021/acsenergylett.2c01065
Suk-Young Yoon ₁ , Young-Ju Lee ₁ , Hyungmin Yang ₁ , Dae-Yeon Jo ₁ , Hyun-Min Kim ₁ , Yuri Kim ₁ , Seong Min Park ₁ , Seoyeon Park ₁ , Heesun Yang ₁

Affiliation

Most state-of-the-art quantum dot light-emitting diodes (QLEDs) adopt metal oxide nanoparticles (NPs) as the electron transport layer (ETL). However, such ETL materials usually entail not only charge unbalance in the quantum dot (QD) emitting layer (EML) but also exciton quenching at the EML/ETL interface. To solve the above troubles, herein, the surface modification of ZnMgO NPs is implemented with an acrylate functional species. The acrylate functionalization is found to not only mitigate the emission quenching at the EML/ETL interface but also upshift the energetic positions of ETL in favor of charge balance. The red QLED with ZnMgO NPs functionalized with an optimal content of surface acrylate produces markedly enhanced electroluminescent performance (specifically, 16 954 cd/m² in luminance and 12.0% in external quantum efficiency) relative to the control device with pristine ZnMgO NPs. The applicability of acrylate-functionalized ZnMgO NPs to green InP QLEDs is further tested, verifying the universal validity of the present surface modification of ETL materials over red and green devices.

中文翻译：

通过表面功能化的 ZnMgO 电子传输层增强 InP 量子点发光二极管的性能

大多数最先进的量子点发光二极管 (QLED) 采用金属氧化物纳米粒子 (NPs) 作为电子传输层 (ETL)。然而，这种 ETL 材料通常不仅会导致量子点 (QD) 发射层 (EML) 中的电荷不平衡，还会导致 EML/ETL 界面处的激子猝灭。为了解决上述问题，本文采用丙烯酸酯官能团对 ZnMgO NPs 进行表面改性。发现丙烯酸酯官能化不仅可以减轻 EML/ETL 界面处的发射猝灭，还可以提高 ETL 的能量位置，有利于电荷平衡。具有最佳表面丙烯酸酯含量的 ZnMgO NPs 功能化的红色 QLED 产生显着增强的电致发光性能（具体而言，16 954 cd/m ²相对于具有原始 ZnMgO NPs 的控制装置，亮度和外部量子效率为 12.0%。进一步测试了丙烯酸酯功能化 ZnMgO NPs 对绿色 InP QLED 的适用性，验证了目前 ETL 材料表面改性在红色和绿色器件上的普遍有效性。

更新日期：2022-06-08

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