Enhanced Electron Charging Induces Positive Aging of QD-LEDs: An Electrically Excited Transient Absorption Study

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2026-10-12 DOI:10.1021/acs.nanolett.6c03813

Zhijie Yan,Bo Li,Wenjing Zhang,Yaqi Guo,Leilei Zhao,Qing Xue,Yu Yan,Xingzhi Wang,Huaiyu Xu,Xiaosuo Wang,Huaibin Shen,Fengjia Fan

{"title":"Enhanced Electron Charging Induces Positive Aging of QD-LEDs: An Electrically Excited Transient Absorption Study","authors":"Zhijie Yan,Bo Li,Wenjing Zhang,Yaqi Guo,Leilei Zhao,Qing Xue,Yu Yan,Xingzhi Wang,Huaiyu Xu,Xiaosuo Wang,Huaibin Shen,Fengjia Fan","doi":"10.1021/acs.nanolett.6c03813","DOIUrl":null,"url":null,"abstract":"Quantum dot light-emitting diodes (QD-LEDs) require encapsulation to extend their storage and operational lifetime. However, acidic encapsulants commonly used usually induce an anomalous positive aging phenomenon─the device performance improves rather than decreases in the initial days. These uncontrollable gains hinder the commercialization of QD-LEDs, yet no study to date has directly probed the in situ evolution of charge carriers during this process. Here, we employ electrically excited transient absorption (EETA) spectroscopy to investigate how encapsulants influence charge carrier dynamics in QD-LEDs. Taking red QD-LEDs as a model system, we demonstrate that positive aging is accompanied by enhanced electron charging in the quantum dot (QD) layer and accelerated electron injection into the emissive layer. Furthermore, we show that acid-induced progressive passivation of surface defects on ZnMgO nanoparticles improves electron injection efficiency. This work reveals that enhanced electron charging induces positive aging in QD-LEDs.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"69 1","pages":""},"PeriodicalIF":9.1000,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nano Letters","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1021/acs.nanolett.6c03813","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Quantum dot light-emitting diodes (QD-LEDs) require encapsulation to extend their storage and operational lifetime. However, acidic encapsulants commonly used usually induce an anomalous positive aging phenomenon─the device performance improves rather than decreases in the initial days. These uncontrollable gains hinder the commercialization of QD-LEDs, yet no study to date has directly probed the in situ evolution of charge carriers during this process. Here, we employ electrically excited transient absorption (EETA) spectroscopy to investigate how encapsulants influence charge carrier dynamics in QD-LEDs. Taking red QD-LEDs as a model system, we demonstrate that positive aging is accompanied by enhanced electron charging in the quantum dot (QD) layer and accelerated electron injection into the emissive layer. Furthermore, we show that acid-induced progressive passivation of surface defects on ZnMgO nanoparticles improves electron injection efficiency. This work reveals that enhanced electron charging induces positive aging in QD-LEDs.

Abstract Image

查看原文本刊更多论文

增强电子充电诱导qd - led的正老化：电激发瞬态吸收研究

量子点发光二极管（qd - led）需要封装以延长其存储和使用寿命。然而，通常使用的酸性封装剂通常会引起异常的正老化现象，器件的性能在最初的几天内不是下降而是提高。这些不可控的增益阻碍了qd - led的商业化，但迄今为止还没有研究直接探讨在这一过程中载流子的原位演化。在这里，我们采用电激发瞬态吸收（EETA）光谱来研究封装剂如何影响qd - led中的载流子动力学。以红色QD- led为模型系统，我们证明了正老化伴随着量子点（QD）层中电子充电的增强和发射层中电子注入的加速。此外，我们发现酸诱导的ZnMgO纳米颗粒表面缺陷的逐步钝化提高了电子注入效率。这项工作揭示了增强的电子充电诱导了qd - led的正老化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.