超细Sr_2CeO_4粉体微乳液鄄高温法制备条件的正交试验及其发光性能研究  

Formation Conditions and Photoluminescence for Superfine Sr_2CeO_4 Powder Prepared by Microemulsion-thermochemistry Method with Orthogonal Experiments

作　　者：邢德松[1,2] 龚孟濂[1,2] 石建新[1,2] 

机构地区：[1]中山大学光电材料与技术国家重点实验室 [2]中山大学化学与化学工程学院,广州510275

出　　处：《无机化学学报》2005年第5期658-664,共7页Chinese Journal of Inorganic Chemistry

基　　金：广东省自然科学基金(No.021716;No.980342);广东省科技计划(No.B10502)资助项目。

摘　　要：本文首先利用正交试验确定了微乳液鄄高温法合成蓝色发光Sr2CeO4超细粉体的最佳制备条件。接着研究了最佳条件下制备的Sr2CeO4超细粉体的性能。场发射扫描电镜(FE鄄SEM)显示,在850℃、900℃、1000℃或者更高温度下退火4h制备的粉体的形状分别呈球状、梭状和球状,平均粒径分别在100nm左右和1μm以内。X射线粉末衍射数据分析表明,该超细粉体属于正交晶系。室温下的光致发光光谱显示,该粉体的激发光谱有3个激发峰,主峰分别位于262nm、281nm和341nm,而其发射光谱只呈现出1个发射峰,主峰位于约470nm。与高温固相制备方法相比,微乳液鄄高温法可以在较低温度下制备出超细的粉体,而且它不但在262nm处出现了一个新的激发峰,主激发峰和发射峰的位置也分别蓝移了大约30nm和12nm。The optimal formation conditions of Sr2CeO4 superfine powders prepared by microemulsion-thermo-chemistry method were fixed firstly with orthogonal experiments. Then, the Sr2CeO4 powders prepared on the optimal formation conditions were characterized. Field emission scanning electron microscopy (FE-SEM) images showed that the Sr2CeO4 sample fired at 850 degrees C for 4 h was spheric-like with an average diameter about 100 nm while the samples sintered at 900 degrees C for 4 h and 1000 degrees C for 4 h were shuttle-like shape and spheric-like respectively with sizes less than 1 mu m. X-ray Diffraction (XRD) patterns disclosed that the superfine Sr2CeO4 exhibited an orthorhomble crystal structure. The room-temperature broad photoluminescence (PL) spectra indicated that their excitation peaks had three bonds, around 262 nm, 281 nm and 341 nm, and their emission peaks were all at 470 nm. Compared with the samples prepared by high-temperature solid state method, the powders synthesized by microemulsion-thermochemistry method showed their own characteristics of lower formation temperature, smaller particle sizes and blue shifted excitation and emission peaks by about 30 nm and 12 nm, respectively.

关 键 词：SR2CEO4 正交试验 制备条件 高温法 微乳液 性能研究 超细粉体 光致发光光谱 最佳条件 蓝色发光 平均粒径 衍射数据 正交晶系 激发光谱 发射光谱 制备方法 场发射 900 高温度 分析表 X射线 低温度 显示 球状 峰位 

分 类 号：O212[理学—概率论与数理统计] TN104.3[理学—数学]