High-Brightness Perovskite Light-Emitting Diodes with Suppressed Efficiency Roll-off Using the Green Solvent γ-Valerolactone

IF 16 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

ACS Nano Pub Date : 2025-02-26 DOI:10.1021/acsnano.4c1776510.1021/acsnano.4c17765

Jingjing Cao, Wenji Zhan, Meng Ren, Yao Wang, Haifei Wang, Ni Zhang, Yuetian Chen, Tianfu Wang*, Yanfeng Miao* and Yixin Zhao*,

{"title":"High-Brightness Perovskite Light-Emitting Diodes with Suppressed Efficiency Roll-off Using the Green Solvent γ-Valerolactone","authors":"Jingjing Cao, Wenji Zhan, Meng Ren, Yao Wang, Haifei Wang, Ni Zhang, Yuetian Chen, Tianfu Wang*, Yanfeng Miao* and Yixin Zhao*, ","doi":"10.1021/acsnano.4c1776510.1021/acsnano.4c17765","DOIUrl":null,"url":null,"abstract":"The application of promising perovskite light-emitting diodes (PeLEDs) faces a significant challenge known as efficiency roll-off, which refers to the decline in external quantum efficiency (EQE) at high current densities. This issue arises mainly from high trap densities in perovskite films and imbalanced carrier injection, which limit improvements in brightness and stability of PeLEDs. Here, we develop a green solvent strategy using γ-valerolactone (GVL) to suppress efficiency roll-off in PeLEDs. This strategy effectively slows down the crystallization kinetics, yielding cubic-phase formamidinium lead triiodide (α-FAPbI3) films with reduced trap states, enhanced charge carrier injection, and suppressed Auger recombination. As a result, we achieve a record radiance of 1411 W sr–1 m–2 for GVL-based PeLEDs. These PeLEDs exhibit a substantially reduced efficiency roll-off, maintaining an EQE above 20% even at a high current density of 900 mA cm–2. Our findings highlight the potential of the green solvent approach for developing high-brightness, high-efficiency PeLEDs for practical applications.","PeriodicalId":21,"journal":{"name":"ACS Nano","volume":"19 9","pages":"9053–9060 9053–9060"},"PeriodicalIF":16.0000,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Nano","FirstCategoryId":"88","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsnano.4c17765","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

The application of promising perovskite light-emitting diodes (PeLEDs) faces a significant challenge known as efficiency roll-off, which refers to the decline in external quantum efficiency (EQE) at high current densities. This issue arises mainly from high trap densities in perovskite films and imbalanced carrier injection, which limit improvements in brightness and stability of PeLEDs. Here, we develop a green solvent strategy using γ-valerolactone (GVL) to suppress efficiency roll-off in PeLEDs. This strategy effectively slows down the crystallization kinetics, yielding cubic-phase formamidinium lead triiodide (α-FAPbI₃) films with reduced trap states, enhanced charge carrier injection, and suppressed Auger recombination. As a result, we achieve a record radiance of 1411 W sr^–1 m^–2 for GVL-based PeLEDs. These PeLEDs exhibit a substantially reduced efficiency roll-off, maintaining an EQE above 20% even at a high current density of 900 mA cm^–2. Our findings highlight the potential of the green solvent approach for developing high-brightness, high-efficiency PeLEDs for practical applications.

Abstract Image

查看原文本刊更多论文

绿色溶剂γ-内酯抑制滚落的高亮度钙钛矿发光二极管

钙钛矿发光二极管（PeLEDs）的应用面临着效率滚降的重大挑战，这是指在高电流密度下外量子效率（EQE）的下降。这个问题主要是由钙钛矿薄膜中的高陷阱密度和不平衡的载流子注入引起的，这限制了ped亮度和稳定性的提高。在这里，我们开发了一种绿色溶剂策略，使用γ-戊内酯（GVL）来抑制发光二极管的效率滚降。该策略有效地减缓了结晶动力学，生成了三相甲脒型三碘化铅（α-FAPbI3）薄膜，其陷阱态降低，载流子注入增强，俄歇复合受到抑制。因此，我们实现了1411 W sr-1 m-2的基于gpl的pled的创纪录辐射。这些ped的效率滚降大大降低，即使在900 mA cm-2的高电流密度下，EQE也保持在20%以上。我们的发现突出了绿色溶剂方法在实际应用中开发高亮度、高效率等离子体发光二极管的潜力。

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

ACS Nano 工程技术-材料科学：综合

CiteScore

26.00

自引率

4.10%

发文量

1627

审稿时长

1.7 months

期刊介绍： ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.