钙钛矿CaSnO_3∶Pr^(3+)磷光体的发光特性  

Luminescence Properties of CaSnO_3∶Pr^(3+) Perovskite Phosphor

作　　者：贺干武[1] 刘应亮[1] 雷炳富[1] 

机构地区：[1]暨南大学化学系

出　　处：《发光学报》2007年第3期389-392,共4页Chinese Journal of Luminescence

基　　金：国家自然科学基金(50472077;20671042);广东省自然科学基金(05200555);广州市科技计划基金(2006Z3-D0141)资助项目

摘　　要：采用高温固相法合成了一种Pr3+离子激活的钙钛矿结构氧化物CaSnO3磷光体。测定了该磷光体的XRD、光致发光光谱、长余辉发射光谱以及长余辉衰减曲线,研究了该磷光体的热释发光。研究结果表明,CaSnO3∶Pr3+磷光体具有较好的长余辉特性,进一步深入研究有望开发出一种具有实用价值的新型长余辉发光材料。For more than one century, the sulfide phosphors have been used as a long-lasting phosphor. However, the sulfide phosphors are not stable and bright enough for many applications. So there has been a great demand for new type host lattices substitutes in recent years. Since scientists firstly reported the green and blue color emitting long-lasting phosphorescence phenomenon from the Eu^2＋ -doped alkaline earth aluminates, the oxide-based long-lasting phosphorescent materials cent host lattices have attracted more and more conventional long-lasting , especially the aluminate-base and the silicate-base luminesattention and have been developed rapidly to replace the phosphorescent materials. The compounds with perovskite structure are a kind of important luminescent hosts and were paied attention to by researchers in recent years. For example, CaTiO3： Pr^3＋ was found that it has a red long-lasting phosphorescence and it shoots a wavelength to locate at 613 nm, which belongs to the 1^D2→3^H4 transition of Pr^3＋. The red phosphor SrTiO3： Pr^3＋ , Al^3 ＋ was synthesized and found that there exists the energy transfer to Pr^3＋ from co-doped Al. Although stannum is not the same group elements with titanium, its four value states are quite stable and form perovskite structure with alkaline-earth metals oxides. The titanates and stannates of alkaline-earth metals should be one of important materials with afterglow properties as alkali-earth aluminates. The novel phosphors, CaSnO3： Pr^3＋ are prepared by the conventional high-temperature solid-state method and their luminescent properties are systematically investigated. XRD, photoluminescence, long-lasting phosphorescence and thermoluminescence spectra are used to characterize the synthesized phosphors. After irradiation under 254 nm UV light, these phosphors emit near white light and their phosphorescence can be seen with the naked eye in the darkroom clearly. The result of our research reveal that the CaSnO3： Pr^3 ＋ phosphor maybe a novel pract

关 键 词：CaSnO3 镨离子 长余辉发光 钙钛矿 

分 类 号：O482.31[理学—固体物理]