XU Yanqiao ¹, CHEN Ting ^1,2, JIANG Wan ², JIANG Weihui ^1,2, HU Xiaobo ¹, ZHANG Xiaojun¹ , LIU Jianmin²
(1. Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 2. National Engineering Research Center for Domestic &
Building Ceramics, Jingdezhen 333001, Jiangxi, China) 

Abstract: Cu–In–Zn–S (CIZS) quaternary quantum dots (QDs) were prepared via one-pot method in aqueous solution by using glutathione (GSH) and sodium citrate (SC) as dual ligands. The effects of the addition amount of two ligands on the preparation and the PL property of CIZS QDs were studied. The phase, microscopic morphology and photoluminescence (PL) property were measured by means of XRD,TEM and PL spectra, respectively. The bonding mechanism of ligands and the phase composition of QDs were studied by FT-IR and Raman spectra. The results showed that the In₂S₃ phase was observed with the GSH/Cu+ ratio at 5, but this phase separation could be avoided by increasing the addition amount of GSH. Increasing the addition amount of GSH or SC, CIZS QDs were agglomerated significantly, and the size was increased from 2 nm to 4 nm, resulting in a red shift of the PL spectra. The FT-IR results showed that GSH and SC were mainly coordinated with QDs by –SH, –NHR and –C–O–, respectively. Raman spectrum confirmed that chalcopyrite (CH) phase and Cu-Au (CA)ordered phase coexisted in the CIZS QDs.

Key words: quantum dots; aqueous solutions; ligand; photoluminescence