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DOI	10.1016/j.scib.2020.06.024
	Green perovskite light-emitting diodes with simultaneous high luminance and quantum efficiency through charge injection engineering
	Zhang T.; Long M.; Pan L.; Ngai K.; Qin M.; Xie F.; Lu X.; Chen J.; Xu J.
发表日期	2020
ISSN	20959273
起始页码	1832
结束页码	1839
卷号	65 期号:21
英文摘要	Metal halide perovskite light emitting diodes (PeLEDs) have recently experienced rapid development due to the tunable emission wavelengths, narrow emission linewidth and low material cost. To achieve state-of-the-art performance, the high photoluminescence quantum yield (PLQY) of the active emission layer, the balanced charge injection, and the optimized optical extraction should be considered simultaneously. Multiple chemical passivation strategies have been provided as controllable and efficient methods to improve the PLQY of the perovskite layer. However, high luminance under large injection current and high external quantum efficiency (EQE) can hardly be achieved due to Auger recombination at high carrier density. Here, we decreased the electron injection barrier by tuning the Fermi-level of the perovskite, leading to a reduced turn on voltage. Through molecular doping of the hole injection material, a more balanced hole injection was achieved. At last, a device with modified charge injection realizes high luminance and quantum efficiency simultaneously. The best device exhibits luminance of 55,000 cd m−2, EQE of 8.02% at the working voltage of 2.65 V, current density of 115 mA cm−2, and shows EQE T50 stability around 160 min at 100 mA cm−2 injection current density. © 2020 Science China Press
关键词	Balanced charge injection High luminance Molecular doping Perovskite LED Structure design
英文关键词	Efficiency; Electron injection; Light emitting diodes; Luminance; Metal halides; Perovskite; Quantum theory; Auger recombination; Balanced charge injection; Chemical passivation; Electron-injection barrier; Hole injection materials; Injection current density; Photoluminescence quantum yields; State-of-the-art performance; Quantum efficiency
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207299
作者单位	Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong, 999077, Hong Kong; Department of Physics, The Chinese University of Hong Kong, Hong Kong, 999077, Hong Kong; Instrumental Analysis and Research Center, Sun Yat-sen University, Guangzhou, 510275, China
推荐引用方式 GB/T 7714	Zhang T.,Long M.,Pan L.,et al. Green perovskite light-emitting diodes with simultaneous high luminance and quantum efficiency through charge injection engineering[J],2020,65(21).
APA	Zhang T..,Long M..,Pan L..,Ngai K..,Qin M..,...&Xu J..(2020).Green perovskite light-emitting diodes with simultaneous high luminance and quantum efficiency through charge injection engineering.Science Bulletin,65(21).
MLA	Zhang T.,et al."Green perovskite light-emitting diodes with simultaneous high luminance and quantum efficiency through charge injection engineering".Science Bulletin 65.21(2020).