摘要
采用微乳液法合成SrxCa0.99-xEu0.01WO4(x=0.01,0.02,0.05,0.08,0.10,0.20,0.50,0.80,0.99)固溶体.使用TEM、XRD和Raman光谱表征固溶体的形貌和结构,采用荧光分光光度计测试固溶体的光致发光谱.实验结果表明:当Sr2+掺杂摩尔分数从0.05增大到0.99时,固溶体开始由CaWO4逐步转变为SrWO4,其最大声子能量从912cm-1单调增长到922cm-1.通过声子能量可调节掺杂Eu3+的非辐射跃迁速率,进而在直接激发和基质敏化条件下调控Eu3+的发光特性.Sr2+在SrxCa0.99-xEu0.01WO4固溶体中最佳的掺杂摩尔分数为0.05,较低的声子能量对SrxCa0.99-xEu0.01WO4固溶体在紫外激发下成为高效发光的荧光粉具有积极作用.
SrxCa0.99-xEu0.01WO4(x=0.01,0.02,0.05,0.08,0.10,0.20,0.50,0.80,0.99)solid solution phosphors were synthesized using the microemulsion reaction method,and then characterized by TEM,XRD,Raman spectroscopy,and fluorescence spectroscopy.These results indicated that the solid solution changed from CaWO4 to SrWO4,and simultaneously the maximum phonon energy monotonously increased up to 922 cm-1 from 912 cm-1 with increasing Sr2+ doping molar fraction from0.05 to 0.99.The nonradiative decay rates and the characteristic luminescence of Eu3+ ions under direct excitation or host sensitization could be adjusted by the phonon energy distribution.0.05 Sr2+was the optimum doping molar fraction for SrxCa0.99-xEu0.01WO4 solid solution.It was therefore concluded that lower phonon energy played an important role in the improvement of the red photoluminescence of SrxCa0.99-xEu0.01WO4 solid solution phosphors.
作者
高杨
王廷华
董默
于广浩
吕强
GAO Yang;WANG Ting-hua;DONG Mo;YU Guang-hao;Lü Qiang(Department of Medical Imaging,Mudanjiang Medical University, Mudanjiang 157011, China;Department of Nursing,Mudanjiang Medical University, Mudanjiang 157011, China;Medical Research Center, Mudanjiang Medical University, Mudanjiang 157011, China)
出处
《物理实验》
2019年第8期14-21,共8页
Physics Experimentation
基金
黑龙江省教育厅科学技术研究项目(No.2017-KYYWF-0633)
