中文摘要：

以二乙基二硫代氨基甲酸锌（ZDC）为ZnS的前驱体材料、三辛基膦（TOP）为主要配体,在温度不高于200℃的条件下合成了广谱发光的核壳结构CuInS2/ZnS（CIS/ZnS）量子点.研究了ZDC用量、壳层包裹温度和配体对CIS/ZnS光学特性及荧光量子产率的影响.结果表明,使用ZDC可在相对较低的温度下实现ZnS的包裹过程,并且随着包裹温度的提高,ZnS的包裹速度明显加快.吸收光谱、荧光光谱及X射线衍射分析结果表明,使用TOP为配体合成的CIS/ZnS量子点的明显吸收峰为其激发吸收峰.使用荧光分光光度计、高分辨透射电子显微镜、X射线光电子能谱仪和傅里叶变换红外光谱仪对使用不同配体进行壳层包裹得到的样品进行了表征.结果表明,在ZnS的包裹过程中,配体TOP和十二硫醇作为有机层包覆在颗粒表面也会影响量子点的光学性能和晶体生长速度.使用TOP能够加速ZnS的包裹速度,形成的颗粒尺寸均一,其荧光波长可蓝移至550nm.

英文摘要：

CuInS2/ ZnS（ CIS / ZnS） quantum dots（ QDs） were synthesized below 200 ℃ with zinc diethyl dithiocarbamate（ ZDC） as ZnS precursor materials and trioctylphosphine（ TOP） as the main capping ligands.The influence of ZDC amount,shell growth temperature and ligands on the optical properties and quantum yield of CIS / ZnS quantum dots were investigated. The results showed that the growth of ZnS shell could happen above 150 ℃ and ZnS growth speed was accelerated by increasing temperature. The absorption peak of prepared CIS / ZnS using TOP as ligands was defined as exctionic absorption through photoluminescence（ PL）spectromety and X-ray diffraction analysis. The samples were characterized by PL spectrometer,high resolution transmission electron microscope,energy dispersive X-ray spectrometer and Fourier transform infrared spectrometer. The results showed that ligands of TOP and dodecanethiol were overcoated on the surface of nanoparticles as organic layer,which would affect optical properties and crystal growth speed. TOP could increase the shell growth speed and the CIS / ZnS QDs with uniform size were obtained. The PL emission wavelength could be extended to 550 nm.