ZnO:Er/Yb不同形貌纳米颗粒的制备与上转换发光性质研究

分别采用沉淀法、碱腐蚀法、模板法等3种不同的实验方法制备了不同形貌的氧化锌掺杂稀土元素纳米粉末,对所得到的样品进行了上转换光学性质分析.用X射线衍射仪对样品进行了结构分析,用扫描电子显微镜观察了粉末形貌并估算颗粒大小,用荧光光谱仪测试样品的上转换发光光谱并进行了机理分析.结果表明,纳米粉末粒径的大小影响了材料发光的性能.粒径较小的空心球结构颗粒其光学性能优于粒径较大的实心球颗粒.对于空心球结构,当粒径相对较小时,有利于红光上转换发射;而粒径较大时,有利于增强绿光上转换发射.

Investigation on the different morphologies of nanoparticles preparation and upconversion luminescence properties of ZnO doped with Er3+ and Yb3+ ions

Rare-earth-doped zinc oxide nanoparticles have been prepared with three different experimental methods, including precipitation method, alkali corrosion method and template method. The produced samples were analyzed on the upconversion optical properties. The structure analysis was performed on the samples by X-ray diffraction (XRD); the scanning electron microscope (SEM) was used to observe the powder''s morphology and to estimate the particle size; the upconversion spectrum of sample was tested by fluorescence spectrometer and then the mechanism analysis was carried out. The results show that, the optical properties of nanoparticles are related to the size of particles. It has been proved that the smaller hollow spheres have better optical performance than that of the larger solid spheres. For hollow spheres, it is in favor of red upconversion when the size is smaller. On the contrary, it is in favor of green upconversion.