上转换材料LiY(MoO_4)_2:Yb^(3+)/Er^(3+)的光学特性以及温度传感特性的研究  

The Temperature-Sensor and Optical Properties of Up-Conversion Phosphor LiY(MoO_4)_2:Yb^(3+)/Er^(3+)

作　　者：黄穗超 胡正发[1,2] 张伟 Huang Sui-chao;Hu Zheng-fa;Zhang Wei(School of Physics and Optoelectronic Engineering,Guangdong University of Technology,Guangzhou 510006,China;Synergy Innovation Institute for Modern Industries of GDUT,Heyuan 517000,China)

机构地区：[1]广东工业大学物理与光电工程学院,广东广州510006 [2]东源广工大现代产业协同创新研究院,广东河源517000

出　　处：《广东工业大学学报》2019年第1期75-80,共6页Journal of Guangdong University of Technology

基　　金：国家自然科学基金资助项目(21271048);广东省重大科技专项项目(2011A080801015)

摘　　要：采用中温固相反应法合成了发光材料Li Y(Mo O_4)_2:Yb_3^+/Er_3^+,材料具有明显的上转换发光特性.通过X射线衍射仪、荧光光谱对荧光粉的晶体结构以及发光学特性进行了研究.在980 nm激光的激发下,LiY(MoO_4)_2:Yb_(3+)/Er_(3+)在500～575 nm波长范围内出现很强的绿色发射带,主要是源自Er_3^+离子_2H_(11/2)/_4S_(3/2)→_4I_(15/2)的能级辐射跃迁.研究发现其在不同功率的激发下能实现光色调控.在298～513 K温度范围内,通过测量其在_2H1_(1/2(1))→_4I1_(5/2)和_4S3_(/2(1))→_4I1_(5/2)处的荧光强度比,数据拟合图像表明_2H_(11/2(1))/_4S_(3/2(1))热耦合能级上的布居数遵循玻尔兹曼分布,相对灵敏度在298 K达到最大值1.785%K–~1,绝对灵敏度在约473 K达到最大值263.20×10–~4 K–~1,并且热能级_2H1_(1/2(1))/4S3_(/2(1))之间的能隙ΔE为756.71±27.48cm_–~1.基于以上分析,Li Y(Mo O_4)_2:Yb_3^+/Er_3^+荧光粉在温度传感器上具有很好的前景.The phosphors LiY(MoO4)2:Yb^3+/Er^3+with remarkable up-conversion emission character were synthesized by means of high-temperature solid state reaction method.Experiments were carried out to determine the crystal structure,up-conversion emission optical properties and temperature sensing of the phosphors.Under 980 nm laser,the LiY(MoO4)2:Yb^3+/Er^3+exhibits an intensive green emission bands which can be assigned to 2H11/2/4S3/2→4I15/2 transitions.The temperature sensing properties were studied by measuring the fluorescence intensity ratio of the 2H11/2(1)and 4S3/2(1)emitting energy levels in the temperature range from 298 to 513 K.The maximum relative sensitivity was 1.785%K^-1 at 298 K and the maximum absolute sensitivity reach to 263.20×10^-4 K^-1 at 473 K,and the calculated energy gapΔE between 2H11/2(1)and 4S3/2(1)levels was 756.71±27.48 cm^-1,suggesting that the present phosphor is a suitable candidate for optical temperature sensors.

关 键 词：上转换 荧光强度比 温度传感器 

分 类 号：O482.31[理学—固体物理]