The off-stoichiometry effect on the optical properties of water-soluble copper indium zinc sulfide quantum dots

Yanqiao Xu; Ting Chen; Xiaobo Hu; Wan Jiang; Lianjun Wang; Weihui Jiang; Jianmin Liu

doi:10.1016/j.jcis.2017.02.049

The off-stoichiometry effect on the optical properties of water-soluble copper indium zinc sulfide quantum dots

J Colloid Interface Sci. 2017 Jun 15:496:479-486. doi: 10.1016/j.jcis.2017.02.049. Epub 2017 Feb 22.

Authors

Yanqiao Xu¹, Ting Chen², Xiaobo Hu¹, Wan Jiang³, Lianjun Wang⁴, Weihui Jiang⁵, Jianmin Liu⁶

Affiliations

¹ School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China.
² 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.
³ 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.
⁴ 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.
⁵ School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China; National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen 333001, China.
⁶ National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen 333001, China.

PMID: 28257967
DOI: 10.1016/j.jcis.2017.02.049

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.

Keywords: Aqueous synthesis; CIZS quantum dots; Off-stoichiometry; Photoluminescence.

Publication types

Research Support, Non-U.S. Gov't