Effects of aluminum co-doping on photoluminescence properties of Ce3+-doped SiO2 glasses
来源期刊：JOURNAL OF RARE EARTHS2010年第S1期
论文作者：LF KOAO H.C.SWART F.B.DEJENE
文章页码：206 - 210
摘 要：SiO2 glasses co-doped with Al3+ ions were prepared by a sol-gel method by holding 0.5% of Ce3+ ions constant and varying the Al3+ ions concentrations.Thermal stability,the structural,chemical and the optical properties of the samples were studied by using differential scanning calorimetric（DSC）,thermo gravimetric analysis（TGA）,X-ray diffraction（XRD）,scanning electron microscopy（SEM）,energy dispersive spectroscopy（EDS）,UV-vis spectroscopy and photoluminescence spectroscopy（PL）.The DSC and TGA of samples depicted that the presence of dopant and co-dopant decreased the endothermic peak temperature and the yield respectively.SEM images showed that the particles were in the nano-range and spherical in shape.The XRD showed that all the samples were amorphous.The UV absorption measurements indicated that the presence of Al3+ ions significantly reduced the SiO2 absorption band,increased the absorbance intensity of SiO2 and decreased the transmittance as compared to the presence of the Ce3+ ions alone.The photoluminescence results displayed an optimum increase in luminescence intensity when the ratio of Al:Ce was 10:1 and further increase in aluminum content quenched the luminous intensity.
LF KOAO1，H.C.SWART2，F.B.DEJENE1
1. Department of Physics,University of the Free State(Qwaqwa Campus),Private Bag X13,Phuthaditjhaba,9866,South Africa2. Department of Physics,University of the Free State,P.O.Box 339,Bloemfontein,9300,South Africa
摘 要：SiO2 glasses co-doped with Al3+ ions were prepared by a sol-gel method by holding 0.5% of Ce3+ ions constant and varying the Al3+ ions concentrations.Thermal stability,the structural,chemical and the optical properties of the samples were studied by using differential scanning calorimetric（DSC）,thermo gravimetric analysis（TGA）,X-ray diffraction（XRD）,scanning electron microscopy（SEM）,energy dispersive spectroscopy（EDS）,UV-vis spectroscopy and photoluminescence spectroscopy（PL）.The DSC and TGA of samples depicted that the presence of dopant and co-dopant decreased the endothermic peak temperature and the yield respectively.SEM images showed that the particles were in the nano-range and spherical in shape.The XRD showed that all the samples were amorphous.The UV absorption measurements indicated that the presence of Al3+ ions significantly reduced the SiO2 absorption band,increased the absorbance intensity of SiO2 and decreased the transmittance as compared to the presence of the Ce3+ ions alone.The photoluminescence results displayed an optimum increase in luminescence intensity when the ratio of Al:Ce was 10:1 and further increase in aluminum content quenched the luminous intensity.
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