Sol-Gel Derived SiO2-Y2O3∶Eu3+ Nanocomposites and Their PL Properties
来源期刊：Journal of Rare Earths2007年第S1期
论文作者：王忆 刘锦淳 赖绍全 曾庆光
文章页码：277 - 282
摘 要：An improved sol-gel method was used to prepare Eu3+ ions doped SiO2-Y2O3 nanocomposites. Systematic study on the effect of post-annealling treatment on photoluminescence （PL） properties of the samples under various europium ions doping concentrations were carried out. XRD patterns indicate that the samples show an amorphous matrix structure, and the SEM patterns show that the samples present a multi-hole loosen structure, and a rod structure after high-temperature annealling treatment （800 ℃） for 3 h. Raman spectra demonstrate that Y3+ and Eu3+ ions were incorporated into the composites successfully through the sol-gel and post-anneal process. Under the excitation of 387 nm （7F0→5G2） violet light （but not 394 nm （7F0→5L6））, the strongest emission spectrum, the red light, was observed at around 616 nm （5D0→7F2） when the samples were re-treated by annealing at high temperature after 3 months laying aside. Without annealing treatment, the optimized doping mole ratio of Eu ions is about 9%, which is much higher than that doped in SiO2 glass with the concentration of 3.5%, and it then becomes 5% when the samples are treated by high temperature annealing. In addition, the excitation of 532 nm （7F0→5D1） light can also arouse a comparatively strong emission.
王忆，刘锦淳，赖绍全，曾庆光
摘 要：An improved sol-gel method was used to prepare Eu3+ ions doped SiO2-Y2O3 nanocomposites. Systematic study on the effect of post-annealling treatment on photoluminescence （PL） properties of the samples under various europium ions doping concentrations were carried out. XRD patterns indicate that the samples show an amorphous matrix structure, and the SEM patterns show that the samples present a multi-hole loosen structure, and a rod structure after high-temperature annealling treatment （800 ℃） for 3 h. Raman spectra demonstrate that Y3+ and Eu3+ ions were incorporated into the composites successfully through the sol-gel and post-anneal process. Under the excitation of 387 nm （7F0→5G2） violet light （but not 394 nm （7F0→5L6））, the strongest emission spectrum, the red light, was observed at around 616 nm （5D0→7F2） when the samples were re-treated by annealing at high temperature after 3 months laying aside. Without annealing treatment, the optimized doping mole ratio of Eu ions is about 9%, which is much higher than that doped in SiO2 glass with the concentration of 3.5%, and it then becomes 5% when the samples are treated by high temperature annealing. In addition, the excitation of 532 nm （7F0→5D1） light can also arouse a comparatively strong emission.
关键词：
