Facet-induced coordination competition for highly ordered CsPbBr_(3) nanoplatelets with strong polarized emission  

作　　者：Dandan Yang Xiaoming Li Yuelei Li Bo Cai Lin Su Shengli Zhang Zhili Juan Cuifang Meng Dongling Geng Jiaxin Chen Feng Xu Haibo Zeng 

机构地区：[1]MIIT Key Laboratory of Advanced Display Materials and Devices,Institute of Optoelectronics&Nanomaterials,College of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China [2]SEU-FEI Nano-Pico Center,Key Laboratory of MEMS of Ministry of Education,Southeast University,Nanjing 210096,China

出　　处：《Nano Research》2022年第1期502-509,共8页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.61874054,51902160,61725402,and 51972058);Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX20_0271);the Natural Science Foundation of Jiangsu Province(No.BK20180489);Young Elite Scientists Sponsorship Program by CAST(No.2018QNRC001);Fundamental Research Funds for the Central Universities(No.30918011208).

摘　　要：Controllable anisotropic growth of perovskite nanocrystals(NCs)is challenging since it is difficult to separate the nucleation and growth processes.Here,a two-step nucleation strategy is proposed to control the binding interaction between surface ligands and NCs,resulting in facet-induced coordination competition.Oleic acid as surface activated ligand leads to the formation of defective lead bromine octahedron,and the binding interaction between 4-dodecylbenzenesulfonic acid and lead atoms promotes the formation of two kinds of binding interactions.Based on this strategy,the anisotropic growth of CsPbBr_(3) nanoplatelet(NPLs)with adjusted length from 11.4 to 24 nm,and the evolution of NPLs from stacked to tongue-shaped have been realized.Elemental line scan reveals the sulfur atoms mainly distribute at the edge of NPLs.Furthermore,binding energy calculation and experimental results illustrate the coordination competition of different binding interaction on specific facets induces the anisotropic growth of NPLs.Importantly,strong emission anisotropy of highly ordered NPLs with polarization ratio up to 0.58 is illustrated.This work not only deepens our understanding of the controllable synthesis of perovskite NCs,but also provides a reference for the regulation of light emitting diode and soler cells.

关 键 词：CsPbBr_(3)nanoplatelet(NPLs) anisotropic growth benzenesulfonic acid group facet-induced coordination competition polarized emission 

分 类 号：O62[理学—有机化学] TB383[理学—化学]