DOI: 10.1016/j.scib.2021.04.033
论文题名: Stabilizing electroluminescence color of blue perovskite LEDs via amine group doping
作者: Zhang F. ; Song J. ; Cai B. ; Chen X. ; Wei C. ; Fang T. ; Zeng H.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
语种: 英语
中文关键词: Amine-group doping
; Color stability
; Hydrogen bond
; Light-emitting diodes
; Perovskites
; Quantum dots
英文摘要: Voltage loading-induced change in the electroluminescence (EL) wavelength of mixed halide perovskite light-emitting diodes (PeLEDs), so-called color-shift, has become an inevitable phenomenon, which is seriously unfavorable to their applications in lighting and display. Here, we achieve color-stable blue PeLEDs via a hydrogen-bonded amine-group doping strategy. Selecting guanidine (GA) or formamidinium (FA) as amine-group (−NH2) doping source for CsPbBrxCl3−x quantum dots (QDs), experimental and theoretical results reveal that the strong N−H⋯X (X = Br/Cl) bonding can be produced between −NH2 dopants and Pb−X lattices, thereby increasing the migration barrier of halide anions. Resultantly, color-stable sky-blue devices were realized with emission peaks fixed at 490.5 (GA) and 492.5 (FA) nm without any obvious shift as the voltage increases, in sharp contrast devices without N−H⋯X producing a 15 nm red-shift from 487 to 502 nm. Not only that, maximum external quantum efficiency is improved to 3.02% and 4.14% from the initial 1.3%. This finding offers a convenient boulevard to achieve color-stable PeLEDs with high efficiency. © 2021 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170495
Appears in Collections: 气候变化与战略
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作者单位: School of Materials Science and Engineering, MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, Nanjing University of Science and Technology, Nanjing, 210094, China
Recommended Citation:
Zhang F.,Song J.,Cai B.,et al. Stabilizing electroluminescence color of blue perovskite LEDs via amine group doping[J]. Science Bulletin,2021-01-01