Er^3+激活Gd2(MoO4)3的下转换发光与温度传感研究  

Investigation of Down-conversion Luminescence and Temperature Sensing of Gd 2(MoO4)3 Activated with Er3+

作　　者：张静 吴嫣然 庞涛[1] ZHANG Jing;WU Yanran;PANG Tao(School of Science,Huzhou University,Huzhou 313000,China)

机构地区：[1]湖州师范学院理学院,浙江湖州313000

出　　处：《湖州师范学院学报》2020年第10期31-36,共6页Journal of Huzhou University

基　　金：国家自然科学基金项目(11847315);湖州师范学院大学生创新创业训练计划项目(2019-8);湖州师范学院专业建设经费资助。

摘　　要：采用固相反应法制备Er^3+单掺的Gd2(MoO4)3下转换荧光粉.在379 nm紫外线的激发下,Gd2(MoO4)3:Er^3+发射高强度高纯度的绿光,属于Er^3+的^2H(11/2)/^4S(3/2)→^4I(15/2)跃迁.由于Gd2(MoO4)3的特殊晶体结构,Er^3+在Gd2(MoO4)3基质中的最佳掺杂浓度达40%.有关温度发光特性的研究表明,Er^3+的绿光强度随着温度的升高急剧降低,其原因在于温度升高一方面抑制Er^3+的激发和发射速率,另一方面导致绿光发射能级到上能级的热布居.基于两个绿光发射的积分强度与温度的关系,评估Gd2(MoO4)3:40%Er^3+在379 nm激发下的温度传感特性,结果表明,与常规的氟化物上转换材料相比,Gd2(MoO4)3:40%Er^3+显示出良好的温度灵敏度,可能是一种非常有前途的温度传感用荧光材料.In this work,a simple solid-phase reaction method was used to prepare Er 3+single-doped Gd 2(MoO4)3 down-conversion phosphors.Under the excitation of 379 nm ultraviolet light,Gd 2(MoO 4)3:Er 3+produces a green emission with high-intensity and high-purity,corresponding to the 2 H11/2/4S3/2→4I15/2 transition of Er 3+.Because of the special crystal structure of Gd 2(MoO4)3,the optimal doping concentration of Er 3+in the Gd 2(MoO4)3 matrix is as high as 40%.A research on temperature-related luminescence properties shows that the green emission intensity of Er 3+decreases sharply with the increase of temperature.The reason is that the increased temperature inhibits the excitation of Er3,causing the thermal population of the green emitting level to the upper energy level.Finally,the temperature sensing behavior of Gd2(MoO4)3:40%Er3+under excitation at 379 nm was evaluated based on the relationship between integrated intensity of two green emissions and temperature.Compared with conventional fluoride upconversion materials,Gd 2(MoO4)3:40%Er 3+shows good temperature sensitivity,thus it may be a very promising candidate for luminescence temperature sensing.

关 键 词：紫外激发 下转换发光 温度传感 ER^3+ 

分 类 号：O643[理学—物理化学]