Hybrid Perovskite Light‐Emitting Diodes Based on Perovskite Nanocrystals with Organic–Inorganic Mixed Cations |
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| Authors: | Xiaoli Zhang He Liu Weigao Wang Jinbao Zhang Bing Xu Ke Lin Karen Yuanjin Zheng Sheng Liu Shuming Chen Kai Wang Xiao Wei Sun |
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| Affiliation: | 1. Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055 China;2. School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, SingaporeE‐mail: , ,;3. School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore;4. Physical Chemistry, Centre of Molecular Devices, Department of Chemistry, ?ngstr?m Laboratory, Uppsala University, Uppsala, SE‐75120 Sweden;5. School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072 China;6. Institute of Materials Research and Engineering (IMRE), A*STAR, Fusionopolis Way, 138634 Singapore, Singapore;7. Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055 ChinaE‐mail: , , |
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| Abstract: | Organic–inorganic hybrid perovskite materials with mixed cations have demonstrated tremendous advances in photovoltaics recently, by showing a significant enhancement of power conversion efficiency and improved perovskite stability. Inspired by this development, this study presents the facile synthesis of mixed‐cation perovskite nanocrystals based on FA(1?x )Csx PbBr3 (FA = CH(NH2)2). By detailed characterization of their morphological, optical, and physicochemical properties, it is found that the emission property of the perovskite, FA(1?x )Csx PbBr3, is significantly dependent on the substitution content of the Cs cations in the perovskite composition. These mixed‐cation perovskites are employed as light emitters in light‐emitting diodes (LEDs). With an optimized composition of FA0.8Cs0.2PbBr3, the LEDs exhibit encouraging performance with a highest reported luminance of 55 005 cd m?2 and a current efficiency of 10.09 cd A?1. This work provides important instructions on the future compositional optimization of mixed‐cation perovskite for obtaining high‐performance LEDs. The authors believe this work is a new milestone in the development of bright and efficient perovskite LEDs. |
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| Keywords: | LEDs mixed‐cation perovskites organic– inorganic |
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