Structure and Luminescence Properties of Eu3+ Doped SiO2 Glass Synthesized by Sol-Gel Process
来源期刊：JOURNAL OF RARE EARTHS2002年第3期
论文作者：吴红英 翁诗甫 王喜贵 谢大弢 吴瑾光
Key words：rare earths; sol-gel method; Eu3+-doped silica glass;
Abstract: Under different annealing temperatures, Eu3+-doped SiO2 gel and glass were prepared by sol-gel method, and the structure and luminescent properties were studied with excitation spectra, emission spectra, IR and DTA-TG. The results show that the fluorescent intensity tends to get stable when concentration of Eu3+ doped is above 1.86 % (mass fraction) most water absorbed by the gel was removed at 300 ℃, and that the emission spectrum of Eu3+, with peaks at 614, 588, 577 nm, is due to 5 D0→7F2, 5 D0→7F1, 5 D0→7F0 transitions, and the excitation peaks at 318, 362, 380, 393, 412 and 462 nm were observed. These results illustrate that the temperature range of 300～500 ℃ is critical for the structure conversion from gel to glass, and the fluorescence is strongly quenched by water.
吴红英1，翁诗甫2，王喜贵1，谢大弢2，吴瑾光2
(1.Department of Chemistry, Inner Mongolia Normal University, Huhhot 010022, China;
2.State Key Laboratory of Rare Earth Materials Chemistry and Application, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China)
Abstract:Under different annealing temperatures, Eu3+-doped SiO2 gel and glass were prepared by sol-gel method, and the structure and luminescent properties were studied with excitation spectra, emission spectra, IR and DTA-TG. The results show that the fluorescent intensity tends to get stable when concentration of Eu3+ doped is above 1.86 % (mass fraction) most water absorbed by the gel was removed at 300 ℃, and that the emission spectrum of Eu3+, with peaks at 614, 588, 577 nm, is due to 5 D0→7F2, 5 D0→7F1, 5 D0→7F0 transitions, and the excitation peaks at 318, 362, 380, 393, 412 and 462 nm were observed. These results illustrate that the temperature range of 300～500 ℃ is critical for the structure conversion from gel to glass, and the fluorescence is strongly quenched by water.
Key words:rare earths; sol-gel method; Eu3+-doped silica glass;
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