title: The off-stoichiometry effect on the optical properties of water-soluble copper indium zinc sulfide quantum dots.
abstract: CuInZnS quantum dots (CIZS QDs) were prepared via reflux method in aqueous solution using CuCl2·2H2O, InCl3·4H2O, Zn(OAc)2·2H2O and Na2S·9H2O as raw materials, l-glutathione (GSH) and sodiumcitrate (SC) as stabilizing agents, respectively. The effects of off-stoichiometry (Cu/In and Zn/Cu ratios) on the crystal structure and morphology were systematically studied by means of X-ray diffraction (XRD) and high-resolution transmission electron microscope (HRTEM), and the relative optical properties were also investigated by absorption and fluorescence spectra. The as-prepared water-dispersible CIZS QDs were around 3-4nm and possessed the tetragonal chalcopyrite crystal structure. The photoluminescence (PL) intensity of QDs was significantly increased with decreasing the Cu/In ratio. Compared with the Cu/In ratio variation, changing Zn/Cu ratio was an effective strategy to realize a more uniform irradiation and a wide range of emission wavelength tunability.
authors.affiliation: School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China.
authors.forename: Yanqiao
authors.initials: Y
authors.lastname: Xu
authors.affiliation: School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China; National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen 333001, China. Electronic address: chenting@jci.edu.cn.
authors.forename: Ting
authors.initials: T
authors.lastname: Chen
authors.affiliation: School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Hu
authors.affiliation: National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen 333001, China; State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
authors.forename: Wan
authors.initials: W
authors.lastname: Jiang
authors.affiliation: National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen 333001, China; State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China. Electronic address: wanglj@dhu.edu.cn.
authors.forename: Lianjun
authors.initials: L
authors.lastname: Wang
authors.affiliation: School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China; National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen 333001, China.
authors.forename: Weihui
authors.initials: W
authors.lastname: Jiang
authors.affiliation: National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen 333001, China.
authors.forename: Jianmin
authors.initials: J
authors.lastname: Liu
keywords: Aqueous synthesis; CIZS quantum dots; Off-stoichiometry; Photoluminescence