碲化锌修饰掺铜硒化锌量子点的合成

以巯基丙酸（mercaptopropionic acid,MPA）作为稳定剂，在水相中合成Cu离子掺杂的ZnSe量子点（quantum dots,QDs），并以ZnTe修饰其表面（ZnSe:Cu/ZnTe QDs）.采用X射线衍射（X-ray diffraction,XRD）、高分辨透视电子显微镜（high resolution transmission electronic microscopy,HRTEM）、紫外可见吸收光谱（ultraviolent-visible spectroscopy,UV-VIS）和光致发光(photoluminescence,PL)荧光光度计对其结构、相貌和光学特性进行表征.结果表明，合成所得荧光量子点的大小为4～6 nm；当激发波长325 nm时，荧光发射峰约为510 nm；经160 ℃热处理后，荧光发射峰会红移至540 nm左右，初步说明ZnTe的修饰会改变ZnSe:Cu量子点荧光发射峰的位置.

Synthesis of ZnTe Modified Cu Ion Doped ZnSe Quantum Dots

This paper studies synthesis of ZnSe quantum dots (QDs) doped with Cu ion in an aqueous solution by using 3-mercaptopropionic acid (MPA) as ligand, and then modified its surface by ZnTe (ZnSe:Cu/ZnTe). The structure, morphology and optical properties of QDs are characterized with X-ray diffraction (XRD), high resolution transmission electronic microscopy (HRTEM), ultraviolent-visible spectroscopy (UV-VIS) and photoluminescence (PL) spectroscopy. The sizes of QDs obtained were 4～6 nm. Under an excitation wavelength of 325 nm, peaks of ZnSe:Cu/ZnTe at 510 nm were observed. Especially, the peaks moved to 540 nm after a heat processing at 160 ℃. The facts indicate that the fluorescence emission peak’s positions of ZnSe:Cu QDs capped by ZnTe surface modification can be changed.