【摘要】 采用外延生长法在低于ZnS晶体成核温度(120℃)的条件下,通过在ZnSe量子点表面生长ZnS,制备出结晶良好的ZnSe/ZnS核壳型量子点。通过X射线衍射(XRD),透射电镜分析(TEM)证实了核壳结构的生成。通过荧光光谱和紫外-可见光吸收光谱分析证实,核壳结构的形成改善了ZnSe量子点的荧光特性。通过改变反应温度、反应时间、反应物的用量等实验参数,可得到不同厚度ZnS壳层包覆的核壳型量子点。所制备的ZnSe/ZnS量子点具有良好的水溶性,可以分散形成稳定、澄清的水溶液。在紫外灯的照射下,溶液呈现明亮的蓝绿色荧光。更多还原

【Abstract】 High quality ZnSe/ZnS(core/shell) quantum dots were synthesized via a epitaxial growth method under the lower temperature than the ZnS crystallization(120 ℃).The core/shell structure was characterized by X-ray diffraction(XRD) and transmission electron microscopy(TEM).Photoluminescence(PL) spectra and absorbance spectra analysis were used to prove that the formation of the core/shell structure can improve the luminescence quality of the bare ZnSe quantum dots.By adapting the reaction temperature,reaction time and the amount of the reactants,the ZnSe/ZnS quantum dots with different shell thickness can be achieved.The as formed ZnSe/ZnS can be well dispersed in water to form stable and clear solutions,which show strong visible blue emission under UV excitation.更多还原