【摘要】 采用溶胶-凝胶法制备SiO2:Sm粉体,通过TG-DSC、FTIR、MAS-NMR、PL对材料的结构和性能进行测试表征。FTIR分析显示样品位于960cm-1的吸收峰归属于Si-O-Sm键的变形振动,29Si MAS-NMR证实Sm3+进入SiO2网络结构。在380nm入射光激发下样品产生除Sm3+特征发光以外的蓝绿荧光,对不同Sm3+掺量样品荧光性能进行对比分析,结果表明这种特殊的荧光发射与Si-O-Sm键的形成有关。更多还原

【Abstract】 SiO2:Sm powders prepared by the sol-gel process were structurally characterized by thermogravimetric-differential scanning calorimetry(TG-DSC),Fourier transform infrared(FTIR) spectraoscopy and 29Si magic angle spinning nuclear magnetic resonance(MAS-NMR).The peaks near 960 cm-1 in FTIR results are assigned to the deformation vibration of Si-O-Sm linkages,and the samarium ion has been incorporated into the framework of SiO2 as validated by 29Si MAS-NMR.Blue-green and red photoluminescence(PL) emission in structural disordered SiO2:Sm powders was observed at room temperature with excitation at 380 nm.Study on the luminescence spectra of SiO2:Sm powders with different doping concentrations of Sm3+ indicates that the generation of the special PL band is related to the formation of Si-O-Sm linkages.更多还原