DOI: 10.1016/j.scib.2020.06.024
论文题名: Green perovskite light-emitting diodes with simultaneous high luminance and quantum efficiency through charge injection engineering
作者: Zhang T. ; Long M. ; Pan L. ; Ngai K. ; Qin M. ; Xie F. ; Lu X. ; Chen J. ; Xu J.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期: 21 起始页码: 1832
结束页码: 1839
语种: 英语
中文关键词: 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
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170154
Appears in Collections: 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
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]. Science Bulletin,2020-01-01,65(21)