Manipulating Crystallization and Deprotonation Reaction through Surface Engineering of ZnO for Bright and Stable Near-Infrared Perovskite LEDs

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2026-10-14 Epub Date: 2026-10-01 DOI:10.1021/acs.nanolett.6c03636

Pengpeng Teng, Haifeng Zhao, Wenbin Wang, Dongqin Yuan, Xingjiao Feng, Yatao Zou, Xiyu Luo, Zhongcheng Yuan, Tiankai Zhang, Lian Duan, Tao Yu, Chunxiong Bao, Weidong Xu, Jie Yang, Sai Bai, Xiaodong Shen

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引用次数: 0

Abstract

Perovskite light-emitting diodes (LEDs) have attracted significant attention owing to their rapidly increasing external quantum efficiencies (EQEs). However, achieving bright and operationally stable perovskite LEDs remains a great challenge. Here, we reveal that the most commonly used surface modifier of zinc-oxide (ZnO) electron-transport layer, polyethylenimine ethoxylate (PEIE), inhibits the perovskite nucleation by inducing in situ chemical reactions of perovskite precursor components, forming thermally unstable interfacial species and reducing long-term operational stability of resultant devices. We develop a surface-engineering strategy by using an ether-based polymer modifier to regulate perovskite crystallization kinetics and simultaneously suppress ZnO-induced deprotonation during long-term device operation. As a result, the optimized near-infrared (NIR) perovskite LEDs exhibit a maximum EQE of 24% and a peak radiance of 539 W sr^–1 m^–2, along with significantly enhanced operational stability. Furthermore, partial substitution of FA with Cs confirms the generality of this strategy, yielding bright NIR devices with an operational half-lifetime of 561 h at 20 mA cm^–2.

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利用ZnO表面工程控制近红外稳定钙钛矿led的结晶和去质子化反应

钙钛矿发光二极管（led）由于其快速提高的外量子效率（EQEs）而引起了人们的广泛关注。然而，实现明亮且运行稳定的钙钛矿led仍然是一个巨大的挑战。本文揭示了氧化锌（ZnO）电子传递层最常用的表面改性剂聚乙烯亚胺乙氧基酸酯（PEIE）通过诱导钙钛矿前驱体组分的原位化学反应抑制钙钛矿成核，形成热不稳定的界面物质并降低所合成器件的长期操作稳定性。我们开发了一种表面工程策略，通过使用醚基聚合物改性剂来调节钙钛矿结晶动力学，同时在设备长期运行期间抑制zno诱导的去质子化。结果表明，优化后的近红外（NIR）钙钛矿led的最大EQE为24%，峰值亮度为539 W sr-1 m-2，同时显著增强了工作稳定性。此外，用Cs部分取代FA证实了这一策略的普遍性，产生了在20 mA cm-2下工作半衰期为561 h的明亮近红外器件。

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

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.