Dipole-assisted hole injection for efficient blue quantum dot light-emitting diodes

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-09-10 DOI:10.1063/5.0226368

Youwei Zhang, Xiangtian Xiao, Ruiqiang Xu, Jingrui Ma, Fumin Lu, Yifan Ye, Xiaoli Zhang, Kai Wang, Xiao Wei Sun

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引用次数: 0

Abstract

Quantum dot light-emitting diodes (QLEDs) present commercial potential and application prospects in both lighting and display technologies. Blue quantum dots (QDs) possess a substantial bandgap and a profound valence band. The significant potential barrier between blue quantum dots and the hole transport layer leads to an imbalance in charge transfer, thereby adversely impacting the device performance. Self-assembled monolayers are attractive for carrier transport. Here, a dynamic self-assembly method is introduced, doping [2-(9H-carbazol-9-yl)ethyl]phosphonic acid (2PACz) into Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) to form electric dipoles at interfaces, realizing better energy level alignment and hole injection rate. The maximum external quantum efficiency rises from 8.77% to 17.26% with 2PACz: PEDOT:PSS strategy, representing a twofold enhancement. This result demonstrates that small molecules undergo dynamic self-assembled bilateral motions during crystallization process, aligning energy levels and passivating interfacial trap states, thereby endowing blue QLEDs with high brightness and high efficiency. This work offers a viable pathway for broader applications of blue QLEDs.

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用于高效蓝色量子点发光二极管的偶极子辅助空穴注入技术

量子点发光二极管（QLED）在照明和显示技术方面都具有商业潜力和应用前景。蓝色量子点（QDs）具有很大的带隙和很深的价带。蓝色量子点与空穴传输层之间的巨大势垒导致电荷转移失衡，从而对器件性能产生不利影响。自组装单层对载流子传输很有吸引力。本文介绍了一种动态自组装方法，即在聚(3,4-亚乙二氧基噻吩)-聚(苯乙烯磺酸)(PEDOT:PSS)中掺入[2-(9H-咔唑-9-基)乙基]膦酸（2PACz），从而在界面上形成电偶极子，实现更好的能级排列和空穴注入率。2PACz 的最大外部量子效率从 8.77% 提高到 17.26%：PEDOT:PSS 策略，最大外部量子效率从 8.77% 提高到 17.26%，提高了两倍。这一结果表明，小分子在结晶过程中会发生动态的自组装双边运动，对齐能级并钝化界面陷阱态，从而赋予蓝色 QLED 高亮度和高效率。这项工作为蓝色 QLED 的更广泛应用提供了一条可行的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.