稀土离子与Si注入ZnO晶体的荧光加强特性研究

项目名称： 稀土离子与Si注入ZnO晶体的荧光加强特性研究

项目编号： No.11475105

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 卢霏

作者单位： 山东大学

项目金额： 86万元

中文摘要： 以离子注入的方法对ZnO晶体进行掺杂是近年来探索制备ZnO发光器件和自旋电子器件的重要方法，掺杂的目的包括对ZnO电学极性的改变、以ZnO为载体的稀土离子(RE)发光中心的掺杂，以及掺入过渡金属离子改变材料磁学性质等。其中采用RE掺杂ZnO实现可见和近红外发光的努力一直在不断地进行，但掺杂后材料的荧光性质始终没能取得令人满意的结果。其主要的原因是RE3+电荷性质与Zn2+不同,RE离子在ZnO中的溶解度及光学活性较低。这使得RE3+在ZnO材料中的荧光效率受到限制。本项目将采取稀土离子与Si离子共注的方式，在RE掺杂的ZnO中引入Si纳米结构。其作用有三方面:以Si纳米晶粒作为媒介增加RE离子的有效吸收截面;借助Si纳米结构的量子效应加强ZnO材料与RE离子之间的能量传递;破坏RE3+离子周围环境的对称性，有利于ER3+内4f能态的电子跃迁。最终实现提高RE掺杂ZnO晶体荧光效率的目。

中文关键词： 离子注入；光致发光；金属纳米颗粒；光波导

英文摘要： Doping ZnO crystal by ion implantation is a very important method in recent exploration of fabricating ZnO-based light emitting and spintronics devices. The purpose of doping ZnO with extrinsic ions includes:modifying the electrical polarity in ZnO, doping rare earth(RE) ions in host material ZnO as luminescent centers and the incorporation of transition metal ions to change the magnetic properties of ZnO material etc. The efforts of using RE-doped ZnO as the visible and near-infrared light-emitting materials have been constantly conducted in recent years; However, few satisfactory results on luminescence properties of RE-doped ZnO was obtained till now. The main reason can be attributed to the difference on charge property of RE3 + and Zn2 + ions, which results in a low solubility and poor optical active property of RE ions in the ZnO crystal. These bring limitation to RE3 + luminescence efficiency in ZnO. In this project we will introduce Si nanostructures in the RE -doped ZnO crystal by co-implanting RE+ and Si+ ions. The role of this approach is threefold : Si nano-crystals act as a medium to increase the effective absorption cross section of RE ions; strengthen energy transfer between the RE ion and ZnO host material with the aid of quantum effects in Si nanostructures; disturb the symmetry of RE3 + ions surrounding environment and conducive 4f-transitions in ER3 + ions. The aim of this project is to achieve improved luminescence efficiency in RE -doped ZnO crystals.

英文关键词： ion implantation;photoluminescence;metal nano-cluster;surface modification