电子俘获型材料Sr_3SiO_5∶Eu^(2+),RE^(3+)(RE=Nd^(3+),Ho^(3+),La^(3+))的光激励和长余辉发光性能的研究  

Photo-Stimulated and Long Persistent Luminescence Properties of Sr_3SiO_5∶Eu^(2+),RE^(3+)(RE=Nd^(3+),Ho^(3+),La^(3+))

作　　者：张哲[1] 徐旭辉[1] 邱建备[1] 张新[1] 余雪[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《光谱学与光谱分析》2014年第6期1486-1491,共6页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(11204113);高等学校博士学科点专项科研基金项目(20115314120001);云南省自然科学基金项目(2011FB022);昆明理工大学分析与测试基金项目(20130159)资助

摘　　要：通过高温固相法制备出系列电子俘获型材料Sr3SiO5∶Eu2+,RE3+(RE=Nd3+,Ho3+,La3+),并对其光激励和长余辉性能进行了研究。经过紫外光源激发后,利用980nm激光照射时,表现出很强的上转换光激励信息读出响应,其归因于较深陷阱(438K)的存在,这种性能在Sr3SiO5∶Eu2+,La3+和Sr3SiO5∶Eu2+,Ho3+两种材料表现尤为明显。随后,对陷阱的深度和载流子浓度进行了研究,并分析产生光激励性能的原因。热释光光谱中电子俘获参数的计算是通过Chen’s半宽方法,得出438K所对应的陷阱深度值,并与980nm激光辐照光源的能量形成对比。与此同时,共掺稀土离子后的余辉性能也有着较大幅度的提高,Sr3SiO5∶Eu2+,La3+的余辉时间更是达到12h以上。研究结果显示,共掺样品的陷阱结构的改变是导致其光激励及余辉性能的根本原因。A series of electron capture materials Sr3 SiO5∶Eu^2＋,RE^3＋（RE= Nd^3＋,Ho^3＋,La^3＋）were prepared by high tem-perature solid state method.The photo-stimulated luminescence （PSL）and long afterglow performance were evaluated.After excited by UV light,it showed a strong up-conversion photo-stimulated read-out response when stimulated by 980 nm laser, which is attributed to the existence of deep traps （438 K）.This property was especially shown in Sr3 SiO5∶Eu^2＋,La^3＋and Sr3 SiO5∶Eu^2＋,Ho^3＋.Subsequently,the trapping depth and carrier concentration were studied.In this way,we verified the cause of PSL.The calculation of parameters of trapping electron in the thermoluminescence spectrum is through the method of Chen＇s half width,getting the value of trapping depth under the temperature of 438 K,which contrasts to the energy of 980 nm laser radiation.At the same time,the afterglow performance after co-doping with rare earth ion was greatly improved.The af-terglow time of Sr3 SiO5∶Eu^2＋,La^3＋is up to 12 hours.Research results show that the change in mixed trap structure is the pri-mary cause of photo-stimulated and long persistent luminescence properties.

关 键 词：电子俘获 光激励发光 光存储 

分 类 号：O634[理学—高分子化学]