15.13%Sr-doped CsPbI_(3) quantum dots with near-unity quantum yield via surface ligand compensation  

作　　者：Yi Peng Wanzhong Gu Yuhui Dong Yucong Ji Danni Yan Ziyun Lin Li Zhang Yousheng Zou Haibo Zeng 

机构地区：[1]MIIT Key Laboratory of Advanced Display Materials and Devices,Jiangsu Province Engineering Research Center of Quantum Dot Display,School of Materials Science and Engineering,Institute of Optoelectronics and Nanomaterials,Nanjing University of Science and Technology,Nanjing 210094,China

出　　处：《Nano Research》2025年第4期534-543,共10页纳米研究(英文版)

基　　金：the National Natural Science Foundation of China(Nos.62374089,61904081,and 51672132);the Natural Science Foundation of Jiangsu Province(No.BK20190449);the Postdoctoral Research Funding Program of Jiangsu Province(No.2020Z144);the Fundamental Research Funds for the Central Universities(No.30923010928).

摘　　要：Sr-doping of perovskite quantum dots(QDs)is a promising strategy to reduce Pb content and improve optical performance and stability.However,excessive Sr introduces new defects that degrade photoluminescence quantum yield(PLQY).Therefore,it is a challenge to balance high optical performance with high doping concentration for the preparation of environmentally friendly perovskite QDs.In this study,we report the highest Sr/Pb ratios Sr-doped CsPbI_(3) QDs(15.13%)with a near-unity PLQY.The balance between high PLQY and high Sr-doping rate is achieved through the introduction of oleylammonium iodide(OAmI)ligand compensation during the anti-solvent purification process,which can form an iodine-enriched environment and effectively passivates the surface defects of QDs caused by excessive Sr-doping.Moreover,the Sr-doped CsPbI_(3) QDs exhibit superior stability in environments with high temperature and humidity or direct contact with water.This strategy provides a novel approach for the preparation of lead-less and lead-free QDs with superior optical performance and stability,offering a potential solution for environmentally friendly applications.

关 键 词：CsPbI_(3)quantum dots Sr-doping ligand compensation photoluminescence quantum yield environmental stability 

分 类 号：O469[理学—凝聚态物理]