Unveiling non-radiative center control in CsPbBr_(3) nanocrystals:A comprehensive comparative analysis of hot injection and ligandassisted reprecipitation approaches  

作　　者：Daocheng Hong Yuchen Zhang Shuhan Pan Hanyu Liu Wei Mao Wanli Zhang Yuhui Ye Zhihong Wei Xuxing Lu Xiaoyong Wang Zhenda Lu Yuxi Tian 

机构地区：[1]Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province,Yancheng Institute of Technology,Yancheng 224051,China [2]Laboratory of Mesoscopic Chemistry of MOE,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China [3]College of Engineering and Applied Sciences,Nanjing University,Nanjing 210023,China [4]National Laboratory of Solid State Microstructures,School of Physics,Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China [5]School of Electronic,Electrical Engineering and Physics,Fujian University of Technology,Fuzhou 350118,China

出　　处：《Nano Research》2024年第5期4525-4534,共10页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22073046,62011530133);the Fundamental Research Funds for the Central Universities(Nos.020514380256,020514380278);the Double-Innovation Doctor Program of Jiangsu Province,China(No.JSSCBS20211151);the Funding for School-level Research Projects of Yancheng Institute of Technology(No.xjr2021062).

摘　　要：Metal-halide perovskite nanocrystals(NCs)have gained significant attention in the field of optoelectronic and photonic devices due to their promising applications.Despite their exceptional optical properties,the impact of different synthetic strategies on the fundamental nature of NCs,such as nonradiative recombination centers,remains poorly understood.In this study,we investigated the photophysical properties of CsPbBr_(3) NCs synthesized using two distinct methods,hot injection and ligand-assisted reprecipitation,at the individual particle level.We observed different blinking behaviors under specific photoexcitation power densities and proposed,through intensity-lifetime analysis and Monte-Carlo simulations,that these different synthetic strategies can fabricate NCs with similar crystal structures but distinct surface quenchers with varying energy levels,which significantly affected the photo-induced blinking-down and blinking-up behaviors in individual NCs.Our findings indicate a practical and feasible approach for controlling defect engineering in perovskite NCs,with significant implications for their use in optoelectronic and other technological applications.

关 键 词：metal-halide perovskite nanocrystals photophysical properties nonradiative recombination centers hot injection method ligand-assisted reprecipitation 

分 类 号：TB383[一般工业技术—材料科学与工程]