非稀土红色荧光粉Mn^(4+):Li_2TiO_3发光特性研究  

Luminescent performances of non-rare earth Mn^(4+):Li_2TiO_3 red phosphors

作　　者：武永华[1] 羊富贵[2] 乔亮[2] 任海科[1] 

机构地区：[1]福建江夏学院电子信息科学学院,福建福州350108 [2]福建江夏学院数理部,福建福州350108

出　　处：《光电子．激光》2017年第8期854-858,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金青年科学基金(51503036);福建省教育厅(JA15537,JK2015057)资助项目

摘　　要：利用高温固相法成功合成了非稀土类红色荧光粉Mn^(4+):Li_2TiO_3,并对所制得的样品进行X射线衍射(XRD)、吸收谱和荧光发射谱等表征。在波长为475nm的LED蓝光照射时,获得了最大强度位于682nm波长处的红色荧光,量子效率约为10%,其对应Mn^(4+)自旋2 Eg→4A2 g。计算了晶体场强度因子Dq和Racah参数B、C,并据此分析了Mn^(4+)在Li_2TiO_3中的电子云重排效应。通过改变掺杂浓度,分析了Mn^(4+)掺杂在Li_2TiO_3中的浓度淬灭效应。最后进行了LED白光性能测试。Non-rare earth Mn4＋ .Li2 TiO3 red phosphors were synthesized through the high temperature solid state reaction method. The structural and luminescent characterizations of the phosphors are de- scribed by analyzing X-ray diffraction （XRD）, absorption spectrum and fluorescence emission spectrum. The phosphors exhibit strong red emission at 682 nrn when it is excited by 475 nm LED,with quantum efficiency approaching 10%, which is ascribed to the spin forbidden transition of 2Eg→4A2g for. The Mn4＋ ions crystal field strength （Dq） and the Racah parameters （B and C） are estimated to evaluate the nephelauxetic effect of Mn4＋ in Li2TiO3 host lattice. Concentration quenching effect of Mn4＋ lumi- nescence in Li2 TiOa is presented. The white-LED properties are also measured.

关 键 词：Mn^4+ 白光LED 红色荧光粉 LizTiO3 

分 类 号：TN104.3[电子电信—物理电子学]