水热合成ZnTe纳米粉的发光性能

利用Zn粉和Te粉为原材料,通过水热法在160℃下合成了ZnTe纳米粉,并用X射线衍射仪、x射线能谱仪、透射电子显微镜和显微Raman光谱对其进行了表征.X射线衍射谱表明合成的ZnTe具有闪锌矿结构.X射线能谱给出的结果表明合成的ZnTe中主要元素是Zn和Te,并含有杂质O.透射电子显微镜照片显示出合成的ZnTe纳米粉...

Photoluminescence Properties of ZnTe Nanopowder Synthesized by Hydrothermal Method

ZnTe nanopowder was synthesized at 160 ℃ by hydrothermal method, in which the zinc and tellurium powders were used as the precursors. The powder was characterized by X-ray diffraction, X-ray energy dispersive spectroscopy, transmission electron microscopy and micro-Raman spectroscopy. The X-ray diffraction pattern indicates that the synthesized ZnTe particles are zinc blend structure. The X-ray energy dispersive spectrum exhibits that the main elements in the ZnTe nanopowder are zinc and tellurium and the impurity is oxygen. The image of transmission electron microscopy shows that the particles in the powder are diversified in size ranging from about 8 to 160 nm and the small particles aggregate easily. Raman spectrum shows there are three longitudinal optical phonon vibration modes of ZnTe centered at about 206,411,615 cm^-1. The photoluminescence of ZnTe nanopowders was investigated at room temperature. The photoluminescence spectrum shows the weak recombination emission of donor-acceptor pairs presented at about 535.6 nm and the strong emission bands related to the complex defects containing Zn vacancies and impurity as well as isoelectronic oxygen trap at about 581,699 nm, respectively. The recombination emission of donor-acceptor pairs at room temperature is reasonably explained by the related theory.