期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202107644
关键词
blade coating; crystallization kinetics; large-area LEDs; light emitting diodes; perovskite
类别
资金
- National Natural Science Foundation of China [61705090, 62004089]
- Natural Science Foundation of Guangdong Province [2020A1515010853]
- Fundamental Research Funds for the Central Universities [21620441]
- Shenzhen Science and Technology Innovation Committee [KQTD2015033110182370]
- Shenzhen Development and Reform Committee [2019-126]
- Opening Project of Key Laboratory of Materials Processing and Mold, Zhengzhou University
A blade coating method with vacuum processing is developed for high-quality perovskite emitting layer deposition, achieving high external quantum efficiencies in PeLEDs. The scalability of the technology is demonstrated with the fabrication of a large-area device showing bright and uniform emitting characteristics.
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 x 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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