Exciton Dissociation and Long-Lived Delayed Components in High-Efficiency Quasi-Two-Dimensional Green Perovskite Light-Emitting Diodes

IF 9.8 1区 物理与天体物理 Q1 OPTICS Laser & Photonics Reviews Pub Date : 2024-11-05 DOI:10.1002/lpor.202400732
Guanwei Sun, Sheng Liao, Guo-Xi Yang, Chenyang Shen, Ling Hong, Denghui Liu, Junrong Pu, Weidong Qiu, Zijian Chen, Zhihai Yang, Fei Huang, Ming-De Li, Shi-Jian Su
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Abstract

Quasi-two-dimensional (quasi-2D) perovskites, consisting of multi-quantum wells (MQWs) separated by organic intercalating cations, exhibit high luminescence efficiency while the photophysical processes involved remain partially obscure due to the uncertainty of the MQWs structure. Herein, a synergetic dual-additive strategy is adopted to prepare quasi-2D perovskite films, where 18-crown-6 and tris(4-fluorophenyl)phosphine oxide are utilized to suppress the formation of low-dimensional perovskites, diminish defect density, and enhance photoluminescence quantum yield to 93.7%. Notably, a long-lived delayed component, spanning hundreds of microseconds, is identified for the first time in perovskite emitters, which correlates with exciton dissociation and recombination, and the differences in temperature-dependent radiative lifetime of the delayed components match with the luminescence properties. Finally, benefiting from lower trap density and more efficient energy-funneling, green PeLEDs treated with dual additives have achieved a high external quantum efficiency of 28.9% and a commendable operating half-lifetime of 17.8 h at an initial brightness of 500 cd m−2. The observation of the long-lived delayed components, coupled with insights into exciton dissociation, provides a profound and comprehensive understanding of the fundamental carrier behavior in perovskite emitters and establishes a direct correlation between the properties of perovskite emitters and their photophysical processes.

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高效准二维绿色过氧化物发光二极管中的激子解离和长寿命延迟成分
由有机插层阳离子隔开的多量子阱(MQWs)组成的准二维(quasi-2D)包晶石具有很高的发光效率,但由于 MQWs 结构的不确定性,其中涉及的光物理过程仍然部分模糊不清。本文采用协同双加成策略制备了准二维包晶薄膜,其中利用 18-冠醚-6 和三(4-氟苯基)氧化膦抑制了低维包晶的形成,降低了缺陷密度,并将光致发光量子产率提高到 93.7%。值得注意的是,在包晶发光体中首次发现了一种长寿命的延迟成分,时间跨度达数百微秒,它与激子解离和重组相关,延迟成分随温度变化的辐射寿命差异与发光特性相匹配。最后,得益于更低的阱密度和更高效的能量通道,使用双添加剂处理的绿色 PeLED 的外部量子效率高达 28.9%,在初始亮度为 500 cd m-2 时的工作半衰期为 17.8 h。对长寿命延迟成分的观察,加上对激子解离的深入了解,使我们对包晶石发光体中的基本载流子行为有了深刻而全面的认识,并建立了包晶石发光体特性与其光物理过程之间的直接联系。
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来源期刊
CiteScore
14.20
自引率
5.50%
发文量
314
审稿时长
2 months
期刊介绍: Laser & Photonics Reviews is a reputable journal that publishes high-quality Reviews, original Research Articles, and Perspectives in the field of photonics and optics. It covers both theoretical and experimental aspects, including recent groundbreaking research, specific advancements, and innovative applications. As evidence of its impact and recognition, Laser & Photonics Reviews boasts a remarkable 2022 Impact Factor of 11.0, according to the Journal Citation Reports from Clarivate Analytics (2023). Moreover, it holds impressive rankings in the InCites Journal Citation Reports: in 2021, it was ranked 6th out of 101 in the field of Optics, 15th out of 161 in Applied Physics, and 12th out of 69 in Condensed Matter Physics. The journal uses the ISSN numbers 1863-8880 for print and 1863-8899 for online publications.
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