Tb^(3+)掺杂SiO_2纳米核壳结构绿光材料的制备及性能研究

Preparation and Luminescent Performance of Tb^(3+) Doped SiO_2 Core-Shell Nanoparticles

用Sol-Gel法合成了SiO2包覆SiO2∶Tb3+的纳米核壳颗粒(用SiO2∶Tb3+@SiO2表示),并研究了核壳配比和制备工艺对其发光性能的影响。TEM和EDS表明SiO2溶液成功包覆于SiO2∶Tb3+表面;通过测试荧光性能,发现制备工艺为壳层先陈化再放入核、核壳配比为1.2g∶25mL时,SiO2∶Tb3+@SiO2较未包覆SiO2∶Tb3+样品PL光谱强度增强,通过测试核壳结构材料的时间分辨光谱得到SiO2∶Tb3+纳米颗粒经SiO2包覆后的荧光寿命延长。

The authors synthesized the core-shell nanopart icles of SiO2-coated SiO2∶Tb3＋ by using sol-gel method（SiO2∶Tb 3＋@SiO2）,and studied the influence of core-shell ratio and preparation craftwork on its luminescence properties.The photograph of TEM and EDS showed that SiO2∶Tb3＋ were coated successfully by SiO2.The authors found th at the samples of SiO2∶Tb3＋@SiO2 prepared by mixing of core and shell after shell aging with the ratio of core/shell being 1.2 g/25 mL had the stron ger fluorescence intensity.Time-resolved spectra showed that the SiO2∶T b 3＋@SiO2 had longer fluorescence life time than SiO2∶Tb3＋.