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

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 J Colloid Interface Sci. 2017;496:479486.

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