Multifunctional FA-Triflate Treatment for Efficiency and Reliability Enhancements of Quasi-2D Perovskite Light-Emitting Di odoes

IF 18.5 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Do-Hyun Kwak, Seung-Beom Cho, Chang-Xu Li, Yu-Na Choi, Il-Kyu Park
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Abstract

The quasi-2D perovskite family, PEA₂(FA0.7Cs0.3) n-1PbnBr₃n+1 (n = 2, 3, …, ∞), has emerged as an efficient emission layer for next-generation perovskite light-emitting diodes (PeLEDs) due to its self-aligned multi-quantum well structure of mixed phases, facilitating efficient energy transfer from lower to higher n-phases compared to bulk perovskites. However, despite their advantageous energy transfer characteristics, quasi-2D perovskites have suffered from efficiency and stability issues. During the formation of quasi-2D perovskite films, internal defects arise, and the predominant presence of lower n-phase domains in the internal phase distribution leads to susceptibility to external environmental conditions, which are crucial for stability. Here, an approach is proposed to simultaneously enhance the emission efficiency and stability of quasi-2D perovskites by introducing formamidinium trifluoromethanesulfonate (FA-Triflate). FA-Triflate effectively suppresses the formation of lower n-phases, passivates intrinsic defects, and enhances humidity resistance by improving hydrophobicity. This approach increased the photoluminescence quantum yield of quasi-2D perovskite films from 52.2% to 70.4%. PeLEDs with FA-Triflate-treated quasi-2D perovskites show an improvement in external quantum efficiency from 6.4% to 16.6%, along with a device lifetime extension of over 3 000%. These findings demonstrate that FA-Triflate treatment significantly enhances the overall emission efficiency and stability of quasi-2D perovskite films for optoelectronic applications.

Abstract Image

多功能fa -三氟酸盐处理增强准二维钙钛矿发光二极管的效率和可靠性
准二维钙钛矿族PEA₂(FA0.7Cs0.3) n- 1pbnbr₃n+1 (n = 2,3,…,∞)由于其混合相的自排列多量子阱结构,与块体钙钛矿相比,可以从低n相高效地转移到高n相,从而成为下一代钙钛矿发光二极管(PeLEDs)的高效发射层。然而,尽管具有良好的能量转移特性,准二维钙钛矿仍然存在效率和稳定性问题。在准二维钙钛矿薄膜的形成过程中,会产生内部缺陷,并且在内部相分布中主要存在低n相畴,导致外部环境条件的敏感性,这对稳定性至关重要。本文提出了一种通过引入三氟甲脒甲磺酸盐(FA-Triflate)来同时提高准二维钙钛矿发射效率和稳定性的方法。FA-Triflate有效抑制了低n相的形成,钝化了固有缺陷,并通过改善疏水性提高了耐湿性。该方法将准二维钙钛矿薄膜的光致发光量子产率从52.2%提高到70.4%。使用fa - triflate处理的准二维钙钛矿的pled显示出外部量子效率从6.4%提高到16.6%,器件寿命延长超过3000%。这些发现表明,FA-Triflate处理显著提高了准二维钙钛矿薄膜光电应用的整体发射效率和稳定性。
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来源期刊
Advanced Functional Materials
Advanced Functional Materials 工程技术-材料科学:综合
CiteScore
29.50
自引率
4.20%
发文量
2086
审稿时长
2.1 months
期刊介绍: Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.
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