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Conjugated Alkylamine by Two‐Step Surface Ligand Engineering in CsPbBr 3 Perovskite Nanocrystals for Efficient Light‐Emitting Diodes
Author(s) -
Zhang Li,
Zhang Qiong,
Xing Xiangyu,
Jiang Yuanzhi,
He Tingwei,
Huang Yanmin,
Ma Zhiwei,
Yang Jien,
Yuan Mingjian
Publication year - 2019
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201800498
Subject(s) - perovskite (structure) , light emitting diode , quantum yield , materials science , photoluminescence , nanocrystal , ligand (biochemistry) , optoelectronics , diode , quantum efficiency , conjugated system , chemistry , fluorescence , nanotechnology , crystallography , optics , polymer , physics , biochemistry , receptor , composite material
Abstract Long alkyl‐chain capped ligands are prerequisites for preserving high photoluminescence quantum yield (PLQY) in perovskite nanocrystals (NCs). Unfortunately, the insulating feature of surface ligands potentially hinders carrier transport in light‐emitting diode (LED) devices, which will degenerate the LED performance. To overcome this shortcoming, we introduce a conjugated molecule, 3‐phenyl‐2‐propen‐1‐amine (PPA), into CsPbBr 3 NCs through a two‐step surface ligand engineering process. Owing to excellent electrical conductivity of PPA, PPA‐capped CsPbBr 3 NCs LEDs exhibit a maximum current efficiency of 23.53 cd A −1 , and a maximum luminance of 26,475 cd m −2 at the wavelength of 517 nm. This work offers a new strategy to improve the quality of CsPbBr 3 NCs and LEDs by introducing conjugation molecular ligands into the all‐inorganic perovskite nanocrystals.