外文题目: Influence of La/Al ratio on the structure and spectroscopy of Tm3+ doped Al2O3-La2O3-SiO2 glasses
作者: Wang, Xue; Kang, Shuai; Fan, Shaohua; Wang, Shikai; Yu, Chunlei; Chen, Danping; Hu, Lili
刊名: J. Alloy. Compd.
年: 2017 卷: 690 页： 583--588
英文关键词:
Tm3+ ion; Glass structure; Al2O3-La2O3-SiO2 glass; Spectroscopic characterization; Al-27 NMR
SILICA FIBER LASERS; SOLID-STATE NMR; MU-M; ENERGY-TRANSFER; AL2O3-SIO2; POWER; IONS
英文摘要:
Lanthanum aluminosilicate (LAS) glasses with compositions (Tm2O3)(0.8)-(Al2O3)(12-x) (La2O3)(x)-(SiO2)(87.2) (x = 0, 1.2, 4.5 mol%; La/Al = 0, 1/9, 3/5) were prepared via a sol-gel method combined with high temperature sintering. The total amount of Al2O3 and La2O3 was 12 mol%. The effect of the La/Al ratio on the structure and spectroscopic properties of Tm3+ has been studied in detail. The structure of Tm-3+ doped LAS glasses was studied via Al-27 nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. The spinning sideband patterns of the Al-27 NMR spectra showed that the population of Tm3+ ions in the vicinity of Al3+ decreased with an increase in the La2O3 concentration. FTIR and Raman spectra suggest that glasses with high La/Al ratios have less interconnected glass networks. The spectroscopic properties of Tm3+ ions were investigated via the Judd-Ofelt method using the measurement of absorption and emission spectra. Both the 1.8 mu m fluorescence intensity and the relative intensity of up-conversion emission of Tm3+ ions decrease with an increase in the La/Al ratio. This indicates reduced cross relaxation between Tm3+ ions in glass with a high La/Al ratio. We conclude that the spatial distribution homogeneity of Tm3+ ions in LAS glass improves when the La/Al ratio increases. (C) 2016 Elsevier B.V. All rights reserved.


文献类型: 期刊论文
正文语种: English
收录类别: SCI
DOI: 10.1016/j.jallcom.2016.08.166


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