掺Pr^(3+)钛酸盐红色长余辉发光性质比较  

Comparation Study on the Red Long-lasting Phosphorescence of Titanates Doped with Pr^(3+)

作　　者：李秀英[1] 廉世勋[1] 朱爱玲[1] 李承志[1] 张华京[1] 

机构地区：[1]湖南师范大学化学化工学院,中国长沙410081

出　　处：《湖南师范大学自然科学学报》2005年第1期48-51,共4页Journal of Natural Science of Hunan Normal University

基　　金：国家自然科学基金资助项目(20371017)

摘　　要：　通过荧光光谱和磷光衰减曲线比较了CaTiO3∶Pr3+(CaTP),Ca0.8Zn0.2TiO3∶Pr3+(CaZnTP)和Ca2Zn4Ti15O36:Pr3+(Ca2Zn4TP)掺Pr3+钛酸盐的红色长余辉发光性质.测定了它们的热释光曲线.CaTP,CaZnTP和Ca2Zn4TP的热释光峰值分别是49℃,62℃和75℃,热释峰相对强度分别是220,186和1254,这表明掺Pr3+钛酸盐晶体中的缺陷陷阱能级深度为Ca2Zn4TP>CaZnTP>CaTP,陷阱中电子的逸出速率是CaZnTP>CTP>Ca2Zn4TP.从理论上解释了余辉时间顺序为Ca2Zn4TP>CaZnTP>CaTP,起始发光强度顺序为CaZnTP>CTP>Ca2Zn4TP的变化规律.The red long-lasting phosphorescence (RLLP) properties of three kinds of tilanates CaTiO3: Pr3+ (CaTP), Ca0.8Zn 0.2 TiO3:Pr3+ (CaZnTP) and Ca 2Zn4Ti15O36: Pr3+ (Ca2Zn4TP) have been investigated by using fluores-cence spectra, decay curves of phosphorescence and thermoluminescence (TL). It is found that Ca2Zn4Ti15O36: Pr 3+ is a novel red long lasting phosphor (RLLP). The TL glow curves showed that the TL peaks of CaTP, CaZnTP and Ca2Zn4TP are at about 49°C, 62°C and 75°C, and the relative intensity of TL are 220, 186 and 1 254, respectively, which indicate the trap deep levels of defect energy is the order of Ca2Zn4TP > CaZnTP > CaTP, the speed of electron transgression is CaZnTP > CTP > Ca2Zn 4TP. So, it reveal in theory, the reason that CaTP, CaZnTP and Ca2Zn4TP the afterglow is the order of Ca 2Zn4TP > CaZnTP > CaTP, but the luminescent intensity is CaZnTP > CTP > Ca2Zn4TP.

关 键 词：PR^3+ 发光性质 钛酸盐 长余辉 红色 曲线比较 荧光光谱 相对强度 陷阱能级 时间顺序 变化规律 强度顺序 热释光 光衰减 

分 类 号：TQ134.11[化学工程—无机化工] O482.31[理学—固体物理]