1940 nm激光激发下SrF_(2):Ho^(3+)和SrF_(2):Ho^(3+)/Yb^(3+)的上转换发光研究  

Up-conversion of SrF_(2):Ho^(3+)and SrF_(2):Ho^(3+)/Yb^(3+)powders under 1940 nm laser excitation

作　　者：廖湘龙 肖思国 LIAO Xiangong;XIAO Siguo(School of Physics and Optoelectronics,Xiangtan University,Xiangtan411105,Hunan Province,China)

机构地区：[1]湘潭大学物理与光电工程学院,湖南湘潭411105

出　　处：《电子元件与材料》2024年第8期931-937,共7页Electronic Components And Materials

基　　金：国家自然科学基金(11674272);湖南省自然科学基金(2020JJ4589)。

摘　　要：采用高温固相反应法制备了SrF_(2):Ho^(3+)和SrF_(2):Ho^(3+)/Yb^(3+)的荧光粉,在1940 nm激光激发下观察到了SrF_(2):Ho^(3+)和SrF_(2):Ho^(3+)/Yb^(3+)的上转换发光,实现了对2μm激光的可视化。通过XRD测试了样品的晶体结构。SrF_(2)中引入一定量的Pb^(2+)和稀土Ho^(3+)(Yb^(3+))不会改变晶体的结构,但可以改善Ho^(3+)离子的上转换性能,在合适Pb^(2+)浓度掺杂下样品的上转换强度最高可提高18.8%。在优化的SrF_(2)基质中研究了Ho^(3+)离子浓度对上转换发光的影响。随着Ho^(3+)浓度的增加,发光强度先增加后减小,最佳的Ho^(3+)离子摩尔浓度为0.054。在此基础上进一步掺杂Yb^(3+)离子,实现了对上转换发射光颜色的调控。随着Yb^(3+)离子掺杂浓度的增加,545 nm处的绿色发射光逐渐增加,上转换颜色也从红色变为黄色。基于上转换的光谱性能,讨论了样品上转换发光机理和能量传递过程。分析认为,所制备的上转换材料在2μm左右的近红外激光探测上有潜在的应用价值。Fluorescent powders of SrF_(2):Ho^(3+)and SrF_(2):Ho^(3+)/Yb^(3+)were prepared using high-temperature solid-state reaction method.The up-conversion luminescence of SrF_(2):Ho^(3+)and SrF_(2):Ho^(3+)/Yb^(3+)was observed under 1940 nm laser excitation,and visualization of 2μm laser was performed.The crystal structure of the sample was tested by XRD.The introduction of certain amount of Pb^(2+)and rare earth Ho^(3+)(Yb^(3+))into SrF_(2)does not change the crystal structure,but the up-conversion performance of Ho^(3+)ions was improved.Under appropriate Pb^(2+)concentration doping,the up-conversion intensity of the sample can be increased by up to 18.8%.The effect of Ho^(3+)ion concentration on the up-conversion luminescence was studied in an optimized SrF_(2)substrate.With the increase of Ho^(3+)concentration,the luminescence intensity first increases and then decreases,and the optimal molar concentration of Ho^(3+)ion is 0.054.Based on this result,Yb^(3+)ions were further doped to achieve color control of the upconversion emission light.As the doping of Yb^(3+)ions increases,the green emission at 545 nm gradually increases,and the upconversion color also changes from red to yellow.Based on the spectral performance of the up-conversion,the mechanism of the up-conversion luminescence and the process of energy transfer were discussed.It is suggested that the prepared up-conversion material has potential in near-infrared laser detection at around 2μm.

关 键 词：上转换 稀土 红外可视化 能量传递 

分 类 号：O482.3[理学—固体物理]