MCM41-CaTiO_3∶Pr^(3+)超细颗粒的制备及发光性能研究

Preparation and Luminescent Property of MCM41-CaTiO_3∶Pr^(3+) Phosphor

通过溶胶-凝胶法合成了负载CaTiO3∶Pr3+的多孔SiO2复合材料,并探究了材料的最佳煅烧温度。利用SEM、XRD、FT-IR研究了材料的结构,采用荧光分光光度计检测了材料的发光性能,为选择合适的温度提供了依据。材料的激发波长为325nm和375nm;发射波长为613nm,对应于Pr3+的1 D2-3 H4跃迁。随着煅烧温度由500℃升高到1000℃,发光强度先增大后减小,在800℃发光最强,且由SEM电镜看出,合成的材料分布均匀,呈球形,颗粒尺寸在500nm左右,煅烧之后材料的形貌及颗粒尺寸并未发生明显变化。

Mesoporous silica materials functionalized with CaTiO3 ： Pr^3＋ phosphor were prepared by sol-gel method, and the best calcination temperature was investigated. The obtained samples were characterized by X-ray dif fraction（XRD）, Fourier transform-infrared spectroscopy（FT-IR）, scanning electron microscopy（SEM）, and photolu minescence spectrum（PL） respectively. The results show that the obtained samples were homogeneous distributed, good luminescent and spherical materials with a average diameter at about 500nm. The excitation peak was 325nm and 375nm,and the main emission peak was around 613nm due to the ^1D2-^3H4 transition of Pr3＋. With the increasing cal eination temperature ranged from 500℃ to 1000℃, the luminescent intensity exhibited parabola changes which increased and reached a peak at 800℃, then decreased rapidly. At the same time, the morphology of all the samples re main similar in spite of the increase of the calcinations temperature. Considered all effected causes, the best calcination temperature is 800℃.