Sol-Gel Derived SiO2-Y2O3: Eu3+ Nanocomposites and Their PL Properties
An improved sol-gel method was used to prepare Eu<3 +> ions doped SiO<,2>-Y<,2>O<,3> 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 3h. Raman spectra demonstrate that Y<3+> and Eu<3+> ions were incorporated into the composites successfully through the sol-gel and post- anneal process. Under the excitation of 387nm (7F<,0> →5G<,2>) violet light (but not 394nm (7F<,0>→5L <,6>), the strongest emission spectrnm, the red light, was observed at around 616nm (5D<,0>→7F<,2>) 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 SiO<,2> 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 532nm (7F<,0>→5G<,1>) light can also arouse a comparatively strong emission.
Eu<,3+> doped SiO<,2>-Y<,2>O<,3> glass photoluminescence (PL) nanocomposites rare earths
Wang Yi(王忆) Liu Jinchun(刘锦淳) Lai Shaoquan(赖绍全) Zeng Qingguang(曾庆光)
Institute of Thin Film and Nano Materials, Wuyi University, Jiangmen 529020,China Institute of Thin Film and Nano Materials, Wuyi University, Jiangmen 529020, China
国际会议
第五届国际稀土开发与应用研讨会(The Fifth International Conference on Rare Earth Decelopment and Applicatin)
包头
英文
277-282
2007-08-07（万方平台首次上网日期，不代表论文的发表时间）