超声分散辅助合成Sr_xCa_(1-x)TiO_3∶Pr^(3+)红色发光材料及性能  

Synthesis of Pr^(3+)-doped Sr_xCa_(1-x)TiO_3 phosphor by ultrasonic assisted dispersal technique and its luminescence

作　　者：张开砚[1] 罗军[1] 葛明桥[1] 

机构地区：[1]生态纺织教育部重点实验室(江南大学),无锡214122

出　　处：《化工新型材料》2015年第12期42-44,共3页New Chemical Materials

基　　金：国家自然科学基金资助项目(21171074/B010201);中央高校基本科研业务费专项资金项目(JUSRP21003)

摘　　要：以超声分散技术为辅助,采用高温固相法在较低温度下合成了不同Sr^(2+)掺杂量的Sr_xCa_(1-x)TiO_3∶Pr^(3+)红色发光材料,通过扫描电子显微镜、X射线衍射仪、荧光材料余辉特性测试仪、光谱分析仪和荧光分光光度计对样品的微观形貌、物相结构、初始余辉与光色特性、激发和发射光谱进行测试和表征分析。结果显示,经超声分散后的样品颗粒分散性良好,外观接近球形,形貌完整、光洁,粒径分布范围更窄;样品主晶相为CaTiO_3,微量Sr^(2+)的掺入并没有引起样品晶体结构的变化,但随着Sr^(2+)掺入量的增大,样品衍射峰的位置向低角度偏移;所制备发光粉体的激发和发射光谱均为宽带发射,当Sr^(2+)的掺杂量为0.3摩尔分数时,样品的相对发光强度最强,是CaTiO_3∶Pr^(3+)发光强度的近2倍,初始余辉亮度达到352.6mcd/m^2,色纯度最高。SrxCa（1-x）TiO3∶Pr^3＋red luminescent materials with different Sr^2＋doping amount was prepared by ultrasonic dispersing technology.The microstructure,phase structure,colorimetric parameters,excitation and emission spectra of samples were tested and characterized by using scanning electron microscopy,X-ray diffraction,fluorescent spectrophotometer,fluorescent material persistence characteristic tester and spectrum analyzer.The results showed that the samples after ultrasonic dispersion had a good dispersion performance and a nearly spherical appearance.The morphology was integrated,it was smooth and had more narrow distribution of particle size.The main crystallization phases of samples were CaTiO3,the change of Sr^2＋doping amount did not result in the change of crystal structure,but with the increasing of the Sr^2＋doping amount,the relative position of diffraction peak had the trend to the low angle.The broadband peaks were in both the excitation and emission spectra.The emission intensity of samples that Sr^2＋doping amount was 0.3mole fraction achieved its maxmum value,twice as strong as that of CaTiO3∶Pr^3＋.The initial afterglow brightness of that also achieved352.6mcd/m-2.Color purity of that was also highest.

关 键 词：超声分散 CaTiO3∶Pr3+ Sr2+掺杂 发光材料 

分 类 号：TQ422[化学工程]