La_2O_3:Tb^(3+)纳米晶的燃烧法制备及其光致发光性质  

Synthesis and Photoluminescence Properties of La_2O_3:Tb^(3+) Nanocrystals by Combustion Method

作　　者：莎仁[1] 王喜贵[1] 吴红英[1] 李霞[2] 

机构地区：[1]内蒙古师范大学化学与环境科学学院,内蒙古呼和浩特010022 [2]内蒙古科技大学稀土学院,内蒙古包头014010

出　　处：《内蒙古师范大学学报（自然科学汉文版）》2009年第1期66-69,共4页Journal of Inner Mongolia Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20161001);内蒙古自然科学基金资助项目(200408020213)

摘　　要：采用柠檬酸燃烧法制备稀土Tb3+掺杂的La2O3纳米晶,并用X射线衍射仪(XRD)、透射电子显微镜(TEM)和荧光分光光度计对La2O3∶Tb3+纳米晶的结构、形貌和发光性能进行分析.结果表明,不同柠檬酸与稀土离子配比(C/M)制备的样品经800℃退火后均得到结晶性良好的六方相La2O3∶Tb3+纳米晶,晶粒尺寸约为20 nm.纳米晶的三维荧光光谱图显示,Tb3+在基质中的最佳激发波长为280 nm,在280 nm光的激发下,La2O3∶Tb3+纳米晶产生Tb3+的特征发射峰,归属于5D4-7FJ(J=6,5,4)跃迁,主发射峰位置均在543 nm处(5D4-7F5跃迁).同时研究了柠檬酸与稀土离子配比(C/M)对结晶度、发光性质等的影响.By using citric acid-combustion method, the La2O3：Tb^3＋ nanocrystals are prepared. The structure and luminescence properties of La2O3：Tb^3＋ are characterized by XRD,TEM and fluorospectrophotometer. The results indicate that the La2O3：Tb^3＋ nanocrystals with different mixture rate of citric acid and rare earth ion are hexagonal after annealed at 800 ℃, the crystal size is about 20 nm. The three dimension＇spectra show that the excitation wavelength is 280 nm. Activated at 280 nm, the band at 543 nm in emission spectrum is corresponding to 5^D4 -7^FJ （J = 6,5,4） transition of Tb^3＋. Influence of mixture rate of citric acid and rare earth ion on the crystallinity and luminescence properties are also investigated.

关 键 词：La2O3:Tb^3+纳米晶 燃烧法 光致发光 制备 柠檬酸 

分 类 号：O644.1[理学—物理化学]