Vacuum‐Assisted Preparation of High‐Quality Quasi‐2D Perovskite Thin Films for Large‐Area Light‐Emitting Diodes

材料科学 钙钛矿(结构) 光电子学 电致发光 薄膜 量子效率 发光二极管 解耦(概率) 结晶 二极管 纳米技术 化学工程 工程类 控制工程 图层(电子)
作者
Chaoran Chen,Linxiang Zeng,Zhengyan Jiang,Zhenhua Xu,Yijun Chen,Zhen Wang,Shi Chen,Baomin Xu,Yaohua Mai,Fei Guo
出处
期刊:Advanced Functional Materials [Wiley]
卷期号:32 (4) 被引量:37
标识
DOI:10.1002/adfm.202107644
摘要

Abstract Recent years have witnessed marked progress in the electroluminescence efficiency of perovskite‐based light emitting diodes (PeLEDs). Nevertheless, the majority of highly efficient devices feature only several square millimeters with the perovskite emitting layers deposited by nonscalable methods, which hinders their intriguing application in large‐area lightings and displays. Here, a robust crystallization protocol is devised for the deposition of high‐quality perovskite emitting layers by blade coating. Central to this method is the deployment of a vacuum process to the freshly coated precursor film, thereby achieving controllable crystallization kinetics by decoupling precursor deposition and the subsequent thermal annealing. Accordingly, dense and uniform perovskite thin films with efficient energy funneling among the evenly distributed 2D and 3D phases are obtained. PeLED devices based on the vacuum‐processed quasi‐2D cesium lead tribromide layers achieve high external quantum efficiencies of 8.24% and 6.12% on active areas of 0.12 and 1 cm 2 , respectively. The scalability of the technology is further demonstrated by fabricating a 3.5 × 3.5 cm 2 device with bright and uniform emitting characteristic. This work offers a viable approach for further advancing the performance of large‐area PeLEDs by scalable methods.
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