Er^(3+)-Yb^(3+)-Mo^(6+)共掺杂ZrO_2-Al_2O_3固溶体的上转换发光  

Upconversion Emission from Er^(3+)-Yb^(3+)-Mo^(6+) Co-Doped ZrO_2-Al_2O_3Composites

作　　者：肖宇[1] 丛妍[1] 杨杞[1] 张智红[1] 刘朋祖 

机构地区：[1]大连民族学院物理与材料工程学院,辽宁大连116600

出　　处：《光谱学与光谱分析》2013年第11期2913-2916,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(61205178);辽宁省博士启动基金项目(20121073);中央高校基本科研业务费专项资金项目(DC120101172,DC13010105);大连民族学院大学生创新创业训练计划项目(G2012010)资助

摘　　要：采用共沉淀法制备了一系列Al2O3含量由低到高的ZrO2-Al2O3固溶体,并研究了固溶体的晶相结构以及稀土Er3+在固溶体中的上转换发光增强机制。XRD结果表明固溶体为四方晶相ZrO2结构,Al2O3的最高固溶度约为20mol%。上转换发光光谱分析表明,Er3+掺杂ZrO2室温下具有绿色上转换荧光发射,通过共掺杂Yb3+和Mo6+离子,使得Er3+掺杂ZrO2的绿色上转换发光强度增强了约20倍,获得了明亮的黄绿色上转换发光。基质ZrO2通过与Al2O3固溶形成复合氧化物,由于产生的大量氧空位缺陷的能级与Er3+的4 F7/2能级高度相接近,增强了Yb3+-MoO2-4基团(2 F7/2,3 T2)能级向Er3+的4 F7/2能级的能量传递。通过形成固溶体复合氧化物基质材料,使得Er3+的绿色上转换发光在获得20倍增强的基础上又提高了8倍。绿色与红色上转换发光比例的变化也提高了材料的色纯度,上转换发光由黄绿色变为纯绿色。A series of ZrO2-A1203 composites with various compositions were synthesized by co-precipitation method, and the upconversion emission properties of the Er-Yb-Mo co-doped ZrO2-A12 03 composites were investigated in the present paper. The green UC emission in the Er-Yb-Mo co-doped ZrCh is an order of magnitude stronger than that of the Er3＋ single doped sample. When A1203 mixed in ZrO2 crystalline lattice with the most solid solubility, the crystalline ZrO2-A1203 solid solutions is tetra gonal ZrO2. The UC emission is enhanced 8 times in the ZrO2-A1203 solid solutions, which is due to the oxygen vacancies gener ated in the solid solutions, increasing the energy transfer from Yh3＋-MoO^24- to Er3＋.

关 键 词：上转换 ZrO2-Al2O3固溶体 稀土 能量传递 

分 类 号：O433.4[机械工程—光学工程]