液晶与显示2026，Vol.41Issue(7)：932-941,10.DOI:10.37188/CJLCD.2026-0086
自组装界面膜驱动的无传统两亲性表面活性剂反向微乳液法制备高稳定QD@SiO2
Self-assembled interface film-driven reverse microemulsion method without traditional amphiphilic surfactants for preparation of highly stable QD@SiO2
摘要
Abstract
The efficient silica coating of quantum dots(QDs)has long been hindered by the fluorescence quenching problem caused by traditional surfactants.The fundamental reason lies in the competitive adsorption of the hydrophobic chains of surfactants and the surface ligands of QDs,resulting in ligand detachment and the formation of surface defect states.This paper proposes a"soap-free"reverse microemulsion method(Surfactant-Free Reverse Microemulsion,SFRM),completely eliminating traditional amphiphilic surfactants and using isopropanol/ethylene glycol as dual cosolvents to form a stable interface film at the oil-water interface.A nano-reactor without traditional amphiphilic surfactants is constructed,successfully achieving efficient silica coating of CdSe/ZnS quantum dots.Systematic studies show that the photoluminescence quantum yield(PLQY)of QD@SiO2 composites remains at 78.7%～80.6%(average 79.6±0.78%),which is much higher than 26%of the traditional Triton X-100 method.Transmission electron microscopy(TEM)shows that the thickness of the SiO2 shell layer is uniform(14.7 nm)and the particle dispersion is excellent.Based on the initial power(1.0 mW at t=0),the green light power retention rate after 250 h anti-blue light aging test is 93%,significantly better than 55%of the traditional method.This study clarifies the formation mechanism of the nano-reactor without traditional amphiphilic surfactants from the perspective of interface thermodynamics and kinetics,and the protection mechanism of the optical properties of quantum dots.It provides a new path for the controllable synthesis of high-brightness and long-life quantum dot composite materials.关键词
量子点/二氧化硅包覆/表面活性剂/反向微乳液法/荧光稳定性/核壳结构Key words
quantum dots/silica coating/surfactant/reverse microemulsion method/fluorescence stability/core-shell structure分类
数理科学引用本文复制引用
曾智聪,谢莹莹,陈结峰,金磊,张志宽..自组装界面膜驱动的无传统两亲性表面活性剂反向微乳液法制备高稳定QD@SiO2[J].液晶与显示,2026,41(7):932-941,10.基金项目
深圳市科技计划项目重点产业研发计划(No.ZDCY20250901095902003)Supported by Key Industry R&D Plan of Shenzhen Science and Technology Program(No.ZDCY20250901095902003) （No.ZDCY20250901095902003）
