Unravelling the Electrical Field Induced Ion Migration in Flexible OLEDs with PEDOT:PSS Electrodes

IF 8.3 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY ACS Applied Materials & Interfaces Pub Date : 2024-11-05 DOI:10.1021/acsami.4c1346010.1021/acsami.4c13460
Chenxi Liu, Mengze Li, Yifan Wang, Zijie Hou, Jian Chen, Kun Cao, Lihui Liu* and Shufen Chen*, 
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Abstract

The development of flexible organic light-emitting didoes (FOLEDs) has spurred the research on flexible transparent electrodes (FTEs). Poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) is one of the most attractive FTEs due to its adjustable conductivity and compatibility with low-cost and large-scale solution processing techniques. Significantly, highly efficient FOLEDs have been achieved with modified PEDOT:PSS FTEs. However, the intrinsic mechanisms that contribute to device degradation of FOLEDs utilizing PEDOT:PSS FTEs have not yet been fully elucidated. In this work, three ionic liquids (ILs) are used to enhance the electrical conductivity and mechanical flexibility of PEDOT:PSS FTEs. Simultaneously, the influence of the electric field induced ion migration from PEDOT:PSS FTEs on the operational stability of FOLEDs is unraveled. We find that the ILs with larger ionic radii and higher steric hindrance are beneficial to suppressing the electrical field induced ion migration and improving the operational stability of FOLEDs. Finally, large-area and high-performance FOLEDs are achieved based on the IL of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide modified PEDOT:PSS FTEs, which demonstrate a high current efficiency of 98.1 cd/A and a longer lifetime of 66.7 min. This finding may promote the practical application of PEDOT:PSS FTEs in flexible optoelectronics.

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揭示带有 PEDOT:PSS 电极的柔性有机发光二极管中电场诱导的离子迁移
柔性有机发光二极管(FOLED)的发展推动了对柔性透明电极(FTE)的研究。聚(3,4-亚乙二氧基噻吩):聚苯乙烯磺酸盐(PEDOT:PSS)因其可调节的导电性以及与低成本和大规模溶液加工技术的兼容性,成为最具吸引力的 FTEs 之一。利用改性 PEDOT:PSS FTE 实现高效 FOLED 的效果显著。然而,导致使用 PEDOT:PSS FTE 的 FOLED 器件降解的内在机制尚未完全阐明。在这项工作中,使用了三种离子液体 (IL) 来增强 PEDOT:PSS FTE 的导电性和机械柔韧性。同时,我们还揭示了电场诱导离子从 PEDOT:PSS FTEs 迁移对 FOLED 工作稳定性的影响。我们发现,具有较大离子半径和较高立体阻碍的 IL 有利于抑制电场诱导的离子迁移,提高 FOLED 的工作稳定性。最后,基于 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide 修饰的 PEDOT:PSS FTEs 的 IL 实现了大面积、高性能的 FOLED,其电流效率高达 98.1 cd/A,寿命长达 66.7 min。这一发现可能会促进 PEDOT:PSS FTEs 在柔性光电子领域的实际应用。
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来源期刊
ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces 工程技术-材料科学:综合
CiteScore
16.00
自引率
6.30%
发文量
4978
审稿时长
1.8 months
期刊介绍: ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.
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