纳米ZnO和钇铝石榴石的水热法制备及特性表征

发布时间：2018-05-19 00:30

本文选题：纳米ZnO + 钇铝石榴石　；参考：《烟台大学》2010年硕士论文

【摘要】：氧化锌(ZnO)是一种重要的直接宽带隙化合物半导体材料,具有优良的压电、热电、光电特性,其禁带宽度为3.37eV,室温下激子束缚能高达60meV,远高于其它半导体材料。现在诸多研究者已成功生长出了如纳米线、纳米管、纳米带、纳米环等新奇的ZnO纳米结构。这些纳米结构显现出许多不同于体材的优异特性,在制备纳米光电子器件和纳米电子器件方面将发挥重要作用。钇铝石榴石(YAG)单晶属等轴晶系,具有光学均匀性,无双折射效应,是广泛使用的激光和发光基础材料。铈掺杂钇铝石榴石是制备白光LED的首选荧光粉,白光LED将成为替代白炽灯、荧光灯和高强度气体放电灯之后的第四代光源,具有广阔的应用前景。但白光LED的性能距离照明用标准还有一定差距,因此作为LED上游基础材料的一个重要组成部分,YAG:Ce荧光粉的性能仍需要改善提高。本论文的工作有如下几个部分: 1、用水热法制备了硫掺杂比例不同的纳米ZnO粉体,通过X射线衍射(XRD)和扫描电子显微镜(SEM)等手段对样品进行了表征; 2、对纳米ZnO粉体的变温光致发光(PL)现象进行了详细的分析; 3、对纳米ZnO粉体的紫外吸收光谱进行了研究; 4、用水热法制备了铈掺杂钇铝石榴石的纳米粉体,并对其光致发光谱进行了分析。
[Abstract]:Zinc oxide (ZnO) is an important direct wide band gap compound semiconductor material with excellent piezoelectric, thermoelectric and optoelectronic properties. Its band gap is 3.37 EV, exciton binding energy is up to 60 MEV at room temperature, which is much higher than that of other semiconductor materials. Many researchers have successfully grown novel ZnO nanostructures such as nanowires, nanotubes, nanobelts, nanometers and so on. These nanostructures exhibit many excellent properties different from bulk materials and will play an important role in the preparation of nano-optoelectronic devices and nano-electronic devices. Yttrium aluminum garnet single crystal belongs to equiaxed crystal system with optical homogeneity and no birefringence effect. YAGG single crystal is widely used as the basic material of laser and luminescence. Ce doped yttrium aluminum garnet is the preferred phosphor for preparing white LED. White LED will be the fourth generation light source after incandescent lamp fluorescent lamp and high intensity gas discharge lamp. However, the performance of white LED is still far from the standard of lighting. Therefore, as an important component of upstream basic material of LED, the performance of YG: ce phosphor still needs to be improved. The work of this thesis is as follows: 1. Nanocrystalline ZnO powders with different sulfur doping ratios were prepared by hydrothermal method and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). 2. The photoluminescence (PL) phenomenon of nanometer ZnO powder was analyzed in detail. 3. The UV absorption spectra of nanometer ZnO powders were studied. 4. The nanometer powders of cerium doped yttrium aluminum garnet were prepared by hydrothermal method and their photoluminescence spectra were analyzed.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TB383.1

【引证文献】