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以乙酸锌为锌源、硫酸高铈为铈源、硫代乙酰胺为硫源、淀粉为分散剂,微波辅助合成了ZnS∶Ce纳米晶。通过X射线衍射仪、红外光谱仪、荧光分光光度计和激光粒度分析仪对其物相结构、原子键价结构、光学性能和颗粒粒径大小进行了表征分析。研究了不同Ce离子掺杂量对产品结构和光学性能的影响。结果表明:所制备的ZnS∶Ce纳米晶体具有闪锌矿立方相结构,其晶粒大小分布范围为3.5~4.5nm;颗粒大小范围为100~600nm,D50=290nm。激发波长为230nm时,其荧光发射峰在408nm处;掺杂Ce离子浓度增加,ZnS∶Ce纳米晶材料的荧光强度降低,其原因是发生了浓度淬灭现象。
ZnS: Ce nanocrystals were synthesized with zinc acetate as the zinc source, ceric sulfate as the cerium source, thioacetamide as the sulfur source and starch as the dispersant. The phase structure, atomic valence structure, optical properties and size of particles were characterized by X-ray diffraction, infrared spectroscopy, fluorescence spectrophotometer and laser particle size analyzer. The effects of different doping amount of Ce ion on the structure and optical properties of the product were studied. The results show that the prepared ZnS: Ce nanocrystals have a cubic phase of sphalerite with a grain size distribution of 3.5-4.5 nm, a particle size range of 100-600 nm and a D50 of 290 nm. When the excitation wavelength is 230 nm, the fluorescence emission peak is at 408 nm. The concentration of doped Ce ions increases and the fluorescence intensity of the ZnS: Ce nanocrystalline material decreases due to concentration quenching.