高密度闪烁体Nd∶GdTaO_(4)和Nd∶LuTaO_(4)发光跃迁强度计算  

Optical Transition Intensity Calculation of High-Density Scintillator Nd∶GdTaO_(4) and Nd∶LuTaO_(4)

作　　者：张庆礼[1,2] 孙贵花 罗建乔[1,2] 何異 陈迎迎[1,2,3] 高进云 窦仁勤 刘文鹏 王小飞 丁守军[2,4] 张德明 孙彧[1,2] ZHANG Qingli;SUN Guihua;LUO Jianqiao;HE Yi;CHEN Yingying;GAO Jinyun;DOU Renqin;LIU Wenpeng;WANG Xiaofei;DING Shoujun;ZHANG Deming;SUN Yu(Anhui Provincial Key Laboratory of Photonic Devices and Materials Anhui Institute of Optics and Fine Mechanics Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Advanced Laser Technology Laboratory of Anhui Province,Hefei 230037,China;University of Science and Technology of China,Hefei 230026,China;School of Mathematics&Physics Ahut,Anhui University of Technology,Ma’anshan 243032,China)

机构地区：[1]中国科学院合肥物质科学研究院,安徽光学精密机械研究所,光子器件与材料安徽省重点实验室,合肥230031 [2]先进激光技术安徽省实验室,合肥230037 [3]中国科学技术大学,合肥230026 [4]安徽工业大学数理科学与工程学院,马鞍山243032

出　　处：《人工晶体学报》2022年第9期1785-1793,共9页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51172236,51802307);安徽省先进激光技术实验室开放项目(AHL20220ZR04,AHL2021KF07);安徽省重大科技专项(202203a05020002)。

摘　　要：GdTaO_(4)和LuTaO_(4)是具有快发光衰减的新型重闪烁体。采用全谱拟合方法拟合了808 nm激光二极管(LD)激发的M相Nd∶GdTaO_(4)和M′相Nd∶LuTaO_(4)的光致发光谱,给出了它们的跃迁强度参数A k t,p。在808 nm激光激发下,GdTaO_(4)中Nd ^(3+)离子^(4)F _(3/2)能级的上下两个晶场子能级的粒子布居数比例接近1,而在Nd∶LuTaO_(4)中则为1.30、1.41,表明在808 nm激光激发下,Nd ^(3+)的^(4)F_(3/2)两个晶场子能级间的无辐射弛豫速率与激发速率相近。通过给出的跃迁强度参数A_(kt,p)计算了Judd-Ofelt跃迁强度参数Ω_(t),计算了Nd ^(3+)在GdTaO_(4)、LuTaO_(4)中的^(2)P_(3/2)跃迁几率,表明GdTaO_(4)和LuTaO_(4)中Nd ^(3+)的数百纳秒发光跃迁是由高的无辐射跃迁几率导致的快发光衰减。GdTaO_(4) and LuTaO_(4) are heavy scintillators with fast decay fluorescence.The photoluminsecence spectra of M phase Nd∶GdTaO_(4) and M′phase Nd∶LuTaO_(4) excited by a laser diode(LD)of 808 nm were fitted with the full-profile fitting method,and the transition intensity parameters A_(kt,p) were determined.Under the excitation of 808 nm LD laser,the population ratio between the upper and low crystal field energy levels of ^(4)F _(3/2) for Nd^(3+)in GdTaO_(4) is near to 1,but in LuTaO_(4) is 1.30 and 1.41,which indicates that the relaxation rate between two crystal field energy levels is nearly equal to the excitation rate of LD.The Judd-Ofelt transition intensity parametersΩ_(t) were calculated with A k t,p,and the transition probabilities from ^(2) P_( 3/2 )of Nd ^(3+)in GdTaO_(4) and LuTaO_(4) were computed,which indicates that the fast decay fluorescence of several hundred nanoseconds of Nd ^(3+)in GdTaO_(4) and LuTaO_(4) is caused by the high nonradiative transition.

关 键 词：稀土钽酸盐 重闪烁体 跃迁强度 发光 无辐射跃迁 布居数 

分 类 号：O734.3[理学—晶体学]