掺杂浓度对ZnO:Ag纳米棒结构和光致发光性能的影响

Effect of Dopant Concentration on Structure and Photoluminescence of ZnO:Ag Nanorods

摘要: 本文利用水热生长法在掺铝氧化锌(AZO)种子层上以Ag掺杂制备出ZnO:Ag纳米棒，采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和光致发光谱(PL)对所制备样品的晶体结构、表面形貌以及光致发光性能进行了分析。结果表明，随着Ag掺杂比例的增加，ZnO:Ag纳米棒的晶格常数先增大后减小。近紫外发光峰都发生蓝移，在Zn:Ag = 1:0.03时，近紫外发光峰的强度最强，不但出现了明显的“蓝移”，而且Ag离子的掺入也使深能级发光加强。经分析得出在一定的范围内，随着Ag掺杂比例增加，ZnO:Ag纳米棒的近紫外光的强度有明显的增强。

Abstract: ZnO:Ag nanorods were deposited on AZO seed layer by the hydrothermal method in different proportions of Ag doping. The structural, surface morphological and optical properties of the samples were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescence (PL) spectrum. Experimental results show that the lattice constants of ZnO:Ag nanorods increase first then decrease with the rising of Ag doping concentration. And all of the NBE-peaks show blue-shift. The sample deposited at Zn:Ag = 1:0.03 has the highest NBE-peak with apparent blue-shift and a higher deep-level emission peak. So in a certain range, the NBE-peaks of ZnO:Ag nanorods increase obviously with the rising of Ag doping concentration.