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An improved sol-gel method was used to prepare Eu3+ ions doped SiO_2-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 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 532 nm (7F0→5D1) light can also arouse a comparatively strong emission.
An improved sol-gel method was used to prepare Eu3 + ions doped SiO_2-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. 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 ° C) for 3 h. Raman spectra demonstrate that Y3 + and Eu3 + 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 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 then then became 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.