铒镱锂掺杂AZO陶瓷的制备及发光性能研究

发布时间：2018-04-26 01:19

  本文选题：高温固相 + Li+离子掺杂　； 参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：当今世界能源紧缺,太阳能作为可持续能源,有望成为未来的主要能源,AZO作为一种新型太阳电池电极,具有优秀的光电性能,太阳能电池只能吸收可见光,本文主要采用高温固相法制备Er3+、Yb3+掺杂AZO陶瓷,使其具有上转换发光性能,将红外光转换成可见光,并通过在陶瓷中引入Li+离子,进一步加强其上转换发光。设计了AZO陶瓷制备的工艺流程,在不同预烧以及成瓷温度下制备出AZO陶瓷,并通过XRD、SEM、电阻率、霍尔系数、上转换发光等手段,测试AZO结构、形貌、电阻率以及发光的变化,确定了最佳预烧温度为700℃,最佳成瓷温度为1300℃。根据AZO陶瓷制备流程,制备出不同Er3+、Yb3+浓度掺杂的AZO陶瓷,在980nm激光器激发下,得到了明显的红光和较弱绿光,并分别研究Er3+以及离子Yb3+浓度对上转换发光强度的影响,随着Er3+离子和Yb3+离子浓度的增加,荧光强度均出现先增强后减弱的现象。对稀土掺杂AZO陶瓷进行了XRD、电阻率、紫外吸收测试,分析了稀土离子对AZO结构,离子占位以及电阻率的影响,红光功率曲线测定表明红光发射为2光子过程,并在此基础上分析上转换发光机制,红光对应Er3+离子的4F9/2?4I15/2能级跃迁,绿光对应Er3+离子2H11/2/4S3/2?4I15/2能级跃迁。Li+离子的掺入,占据AZO晶格间隙位,改变了晶格对称性,晶体对称性的改变减少了稀土离子的无辐射跃迁,加强上转换发光,同时,随Li+离子变化,荧光颜色由红光向绿光方向移动,测试Li+掺杂AZO红光和绿光的功率曲线,其红绿光都为2光子过程,Li+离子并不会改变AZO中稀土离子的发光机理。通过无交互正交试验得出Er3+为3mol%,Yb3+为2mol%,Li+为4mol%时,红光发射最强,此时荧光单色性较好。
[Abstract]:Nowadays, the world is short of energy. Solar energy, as a sustainable energy, is expected to become the main energy source in the future. AZO, as a new type of solar cell electrode, has excellent photoelectric performance. Solar cells can only absorb visible light. In this paper, Er3 Yb 3 doped AZO ceramics were prepared by high temperature solid state method, which have the properties of up-conversion luminescence. The infrared light was converted into visible light, and the up-conversion luminescence was further enhanced by introducing Li ion into the ceramics. The preparation process of AZO ceramics was designed. The AZO ceramics were prepared at different pre-sintering temperatures. The changes of AZO structure, morphology, resistivity and luminescence were measured by means of XRD-SEM, resistivity, Hall coefficient and up-conversion luminescence. The optimum prefiring temperature is 700 鈩，

本文编号：1803845