title: Hybrid Perovskite Light-Emitting Diodes Based on Perovskite Nanocrystals with Organic-Inorganic Mixed Cations.
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)CsxPbBr3(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)CsxPbBr3, 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-2and 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.
authors.affiliation: Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.|School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Zhang
authors.affiliation: School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore.
authors.forename: He
authors.initials: H
authors.lastname: Liu
authors.affiliation: Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
authors.forename: Weigao
authors.initials: W
authors.lastname: Wang
authors.affiliation: Physical Chemistry, Centre of Molecular Devices, Department of Chemistry, Ångström Laboratory, Uppsala University, Uppsala, SE-75120, Sweden.
authors.forename: Jinbao
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.|School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Xu
authors.affiliation: Institute of Materials Research and Engineering (IMRE), A*STAR, Fusionopolis Way, 138634, Singapore, Singapore.
authors.forename: Ke Lin
authors.initials: KL
authors.lastname: Karen
authors.affiliation: School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore.
authors.forename: Yuanjin
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Liu
authors.affiliation: Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
authors.forename: Shuming
authors.initials: S
authors.lastname: Chen
authors.affiliation: Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Wang
authors.affiliation: Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
authors.forename: Xiao Wei
authors.initials: XW
authors.lastname: Sun
keywords: LEDs; mixed-cation perovskites; organic-inorganic