Effects of aluminum co-doping on photoluminescence properties of Ce3+-doped SiO2 glasses |
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Authors: | LF KOAO H.C.SWART F.B.DEJENE . |
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Affiliation: | C.SWART2,F.B.DEJENE1(1.Department of Physics,University of the Free State(Qwaqwa Campus),Private Bag X13,Phuthaditjhaba,9866,South Africa;2.Department of Physics,University of the Free State,P.O.Box 339,Bloemfontein,9300,South Africa) |
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Abstract: | 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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Keywords: | SiO2:Ce Al when sol-gel molar ration nano-size luminescence enhancement rare earths |
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