单分散Gd_2O_3∶Eu^(3+)@SiO_2的合成及性能

Synthesis and Properties of Monodisperse Gd_2O_3∶Eu^(3+)@SiO_2 Particles

采用溶胶-凝胶法合成SiO2包覆Gd2O3∶Eu3+球型核壳粒子,并对所得产物进行XRD,FT-IR,SEM,TEM,XDS,PL等测试。XRD结果显示:壳层Gd2O3∶Eu3+在600℃开始结晶,随着煅烧温度的升高结晶性提高。SEM,TEM测试结果显示所得核壳粒子具有高分散、均匀球型形貌、粒径大小300nm左右。在255nm的紫外光激发下,合成的荧光粉具有很强的610nm的特征红光。

Gd2 O3 ∶ Eu3＋ layers were deposited on monodisperse SiO2 particles via a sol - gel process ,resulting in the formation of Gd2 O3 ∶Eu3＋ @ SiO2 core-shell particles with the size of 250 nm .The as-prepared samples were characterized by X -ray diffraction （XRD） ,Fourier transform infrared spectroscopy （FT -IR） ,scanning electron microscopy （SEM ） ,transmission electron micros‐copy （TEM ） ,Energy Dispersive X -Ray Spectroscopy （EDS） ,and photoluminescence spectra （PL） . The XRD results indicated the Gd2 O3 ∶Eu3＋ layers began to crystallize on the silica surfaces at 600 ℃and the crystallinity increased with the elevation of annealing temperature .The SEM and TEM ima‐ges showed that obtained the core-shell particles were in spherical shape with narrow size distribu‐tion and non -agglomeration . Under the excitation of ultraviolet （255nm ） , the Eu3＋ ion mainly showed its characteristic red （610nm ,5D0 -7 F2 ） emission in the core-shell particles from Gd2 O3 ∶Eu3＋ shell .