中文摘要：

采用柠檬酸燃烧法制备稀土Tb^3＋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：Tb^3＋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：Tb^3＋纳米晶，晶粒尺寸约为20nm．纳米晶的三维荧光光谱图显示，Tb^3＋在基质中的最佳激发波长为280nm，在280nm光的激发下，La2O3：Tb^3＋纳米晶产生Tb^3＋的特征发射峰，归属于5^D4-7^FJ（J=6，5，4）跃迁，主发射峰位置均在543nm处（5^D4-7^F5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．

英文摘要：

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.