中文摘要：

以NH3·H2O-NH4HCO3混合溶液为复合沉淀剂,制备了LaAlO3∶Eu^3＋纳米晶体.通过X射线衍射、扫描电镜和透射电镜对产物进行了表征,用荧光光度计测试了样品的三维荧光光谱、激发光谱和发射光谱.结果表明：前驱沉淀物经800℃焙烧处理2h,制备出球型形貌,颗粒分散性好、尺寸约为40nm的立方相LaAlO3纳米晶.由三维荧光光谱确定了LaAlO3∶Eu^3＋的最佳监测波长和激发波长,在395nm波长光的激发下观察到纳米LaAlO3中Eu^3＋的591nm（^5D0-^7F1）和613nm（^5D0-^7F2）特征发射谱,磁偶极跃迁^5D0-^7F1的发射峰强度要比电偶极跃迁5D0-7F2更强,而且这种趋势随着焙烧温度的升高明显增强,说明由该法制备的纳米LaAlO3中Eu^3＋离子占据的位置具有高的对称性.

英文摘要：

The LaAlO3∶Eu^3＋nanocrystals were prepared by the complex precipitation processing using NH3·H2O-NH4HCO3 mixture as complex precipitant. The material was characterized by XRD,SEM and TEM techniques. Three dimension spectra,emission and excitation spectra have been measured. The results indicate that the LaAlO3∶Eu3＋nanocrystals were in spheric phase with good dispersion,by annealing at 800 ℃ for 2 h. The crystal size is about 40 nm. The luminescent properties of Eu^3＋ in the LaAlO3 nanocrystals have been measured by 3D,including optimal emission and excitation wavelength. In emission spectrum the band at 591 nm and 613 nm are corresponding to ^5D0-^7F1 and ^5D0-^7F2 transition of Eu^3＋ ions. The intensity of the ^5D0-^7F1 transition is bigger than the ^5D0-^7F2 transition. With increasing in annealing temperature this trend is increased obviously. This phenomenon shows that the Eu^3＋ ion in the LaAlO3 nanocrystals is symmetrical.