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

Author(s) Xu, Y.; Chen, T.; Hu, X.; Jiang, W.; Wang, L.; Jiang, W.; Liu, J.
Journal J Colloid Interface Sci
Date Published 2017 06 15
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.

DOI 10.1016/j.jcis.2017.02.049
ISSN 1095-7103
Citation Xu Y, Chen T, Hu X, Jiang W, Wang L, Jiang W, et al. The off-stoichiometry effect on the optical properties of water-soluble copper indium zinc sulfide quantum dots. J Colloid Interface Sci. 2017;496:479-486.

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