Pr^(3+)掺杂CaTiO_3红色长余辉发光材料的湿法共混-高温固相制备和发光性能  

Wet Blending-High Temperature Solid State Synthesis and Luminescence Properties of Pr^(3+) Doped CaTiO_3 Red Long-Lasting phosphorescent Materials

作　　者：夏昌奎[1,2] 雷芳[1] 施鹰[1] 余爱民[2] 肖维勤 余剑峰[2] 

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]杭州诺贝尔集团有限公司,杭州311100

出　　处：《中国陶瓷》2017年第5期36-41,共6页China Ceramics

摘　　要：采用湿法共混-高温固相法制备了Pr^(3+)掺杂CaTiO_3(CaTiO_3:Pr^(3+))红色长余辉发光材料,并采用X-射线衍射图谱、扫描电子显微照片、激发光谱、发射光谱、衰减曲线和热释光曲线对所得产物的物相、显微结构及发光性能进行了表征。X-射线衍射结果表明所得产物为单一钙钛矿相结构。产物的扫描电子显微镜图像为颗粒状固体,表面光滑,棱角清晰,晶粒发育完整。从激发光谱来看,当Pr^(3+)掺杂量低于0.3mol%时,只有O(2p)→Ti(3d)和Pr^(3+)的4f→5d两个激发峰;当掺杂量高于0.3mol%时,Pr^(3+)的4f-4f弱激发峰开始出现。从发射光谱来看,Pr^(3+)掺杂量对发射光谱的强度没有明显影响,均为集中于612nm处Pr^(3+)的~1D_2→~3H_4特征红光发射。衰减曲线测试表明,Ca_(0.997)TiO_3:0.3%Pr^(3+)的衰减速度最慢。从热释光性能分析来看,Ca_(0.997)TiO_3:0.3%Pr^(3+)的余辉性能最好,之后随着Pr^(3+)掺杂浓度的增加,余辉性能逐渐减弱。因此,CaTiO_3:Pr^(3+)及其衍生物有望成为新型高效的红色系长余辉发光材料。Pr3＋ doped CaTiO3 （CaTiO3 ： Pr3＋） red long lasting phosphorescent materials were prepared by wet blending- high temperature solid state reaction route. The as-prepared CaTiO3 ： Pr3＋ was characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, excitation spectrum, emission spectrum, decay curve and thermoluminescence （TL） performance. The XRD patterns reveal that the phase of the as-obtained CaTiO3 ： Pr3＋ is pure perovskite. The SEM images show that the morphology of the CaTiO3 ： Pr3＋ is particulate-like with smooth surface and clear edges and comers, which indicates that the crystal growth is fine. The excitation spectra of the samples reveal that there are both O（2p）→Ti（3d） and 4f→5d of Pr3＋ excitation peaks when Pr3＋ doping amount is less than 0.3mol%. When Pr3＋ doping concentration is more than 0.3mol%, the 4f-4f weak excitation peak belong to Pr3＋ begins to appear. The emission spectra of the samples show that the doping of PP＋ has no obvious effect on the peak of the emission spectrum, and the emission wavelength is 612nm due to the transition of 1D2 →3H4 of Pr3＋. The decay curves show that the sample Ca0.997TiO3 ： 0.3%Pr3＋ decays slowest among the as-prepared samples. From the TL performance analysis point of view, the long lasting phosphorescent performance of Ca0.997TiO3 ： 0.3%Pr3＋ is better than that of other as-prepared samples. And the long lasting phosphorescent performance declines with the increase of Pr3＋ doping concentration. Therefore Pr3＋ doped CaTiO3 and its derivatives are expected to become the new and efficient red long lasting phosphorescent materials.

关 键 词：红色长余辉发光材料 掺杂浓度 衰减性能 热释光 

分 类 号：TQ174.758.11[化学工程—陶瓷工业]