Regulation of nucleation and crystallization for blade-coating large-area CsPbBr_(3)perovskite light-emitting diodes  

刮涂法制备大面积CsPbBr_(3)钙钛矿发光二极管的成核与结晶调控

作　　者：Guoyi Chen Shuxin Wang Zhiqiu Yu Chaomin Dong Peng Jia Dexin Pu Kailian Dong Hongsen Cui Hongyi Fang Chen Wang Ruimin Gao Fang Yao Weijun Ke Gang Li Guojia Fang 陈国毅;王舒欣;余知秋;董超敏;贾朋;蒲德馨;董开连;崔鸿森;方鸿翼;王晨;高瑞敏;姚方;柯维俊;李刚;方国家

机构地区：[1]Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education,School of Physics and Technology,Wuhan University,Wuhan 430072,China [2]School of Mathematics and Statistics,Huazhong University of Science and Technology,Wuhan 430074,China [3]School of Electronic and Electrical Engineering,Wuhan Textile University,Wuhan 430200,China [4]Shenzhen Research Institute,Wuhan University,Shenzhen 518055,China [5]Department of Electronic and Information Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,China

出　　处：《Science Bulletin》2025年第2期212-222,共11页科学通报(英文版)

基　　金：the support of the National Natural Science Foundation of China(12134010,62074117,and 12174290);the support of the Key R&D Program from Hubei Province(2023BAB102);the support of Guangdong Basic and Applied Basic Research Foundation(2023A1515110636);the Wuhan University mainland-Hongkong Joint Scientific Research Platform Seed Fund Program(202232);Hong Kong Research Grants Council(General Research Fund 15310024);Hong Kong Innovation and Technology Commission(MHKJFS MHP/020/23)。

摘　　要：Metal halide perovskite light-emitting diodes(PeLEDs)and large-area perovskite color conversion layers for liquid crystal display exhibit great potential in the field of illumination and display.Blade-coating method stands out as a highly suitable technique for fabricating large-scale films,albeit with challenges such as uneven nucleation coverage and non-uniformity crystallization process.In this work,we developed an in-situ characterization measurement system to monitor the perovskite nucleation,and crystallization process.By incorporating formamidine acetate(FAAc)into perovskite precursor solutions,the nucleation rate and nuclei density of perovskite were increased,leading to more uniform nucleation.In addition,we inserted a layer of[2-(9H-carbazol-9-yl)ethyl]phosphonic acid above the poly(9-vinylcarbazole)hole transport layer.This layer acts as an anchor for the perovskite nano-crystal nuclei formed in the precursor,enhancing the steric hindrance of the solute and subsequently slowing down the crystal growth rate,thereby improving crystal quality.Based on these improvements,large-area perovskite nano-polycrystalline films with significantly improved uniformity and enhanced photoluminescence quantum yield were obtained.A small-area PeLED(2 mm×2 mm)with a maximum external quantum efficiency of 25.91%was realized,marking the highest record of PeLED prepared by bladecoating method to date.An ultra-large-area PeLED(5 cm×7 cm)was also prepared,which is the largest PeLED prepared by the solution method reported so far.

关 键 词：Perovskite light-emitting diodes Blade-coating method Large-area LED Nucleation and crystallization regulation 

分 类 号：O61[理学—无机化学]