Glass formation range of Bi2O3-B2O3-TeO2 system has been investigated （B2O3 ≤ 40 mol%）. Four glasses with compositions xBi2O3-B2O3-（70-x）TeO2 （x = 40, 50, 60 and 70 tool%） have been prepared by using melt quenc...Glass formation range of Bi2O3-B2O3-TeO2 system has been investigated （B2O3 ≤ 40 mol%）. Four glasses with compositions xBi2O3-B2O3-（70-x）TeO2 （x = 40, 50, 60 and 70 tool%） have been prepared by using melt quenching technique. The effect of Bi2O3 content on thermal stability, optical properties and structures of these four Bi2O3-B2O3-TeO2 glasses is systematically investigated by inductive coupled plasma emission spectrometer （ICP）, differential scanning calorimetry （DSC）, Raman spectra and X-ray photoelectron spectroscopy （XPS）. It is found that the density, refractive index and optical basicity increase with increasing Bi2O3. The Raman spectra and XPS spectra show that the glass network is mainly constituted by the [BiO6] octahedron, [TeO4] trigonal bipyramidal, [TeO3] trigonal pyramid, [BO3] trigonal pyramid and [B04] tetrahedron structural units. With increasing Bi2O3, the coordination number around B atom changes from 3 to 4 and [TeO4] units are converted to [TeO3] units. Bi5＋ ions may exist in Bi2O3-B2O3-TeO2 （BBT） system and their amount grows with increasing Bi2O3 content.展开更多
An Er3＋-doped lead-free bismuth germanate glass is synthesized. Its 2.7-μm emission property is analyzed, and the efficient 2.7-μm emission from the glass is observed under 980-nm laser diode excitation. The prepar...An Er3＋-doped lead-free bismuth germanate glass is synthesized. Its 2.7-μm emission property is analyzed, and the efficient 2.7-μm emission from the glass is observed under 980-nm laser diode excitation. The prepared glass possesses high spontaneous transition probability （64.8 s^-1） and a large calculated emission cross section （6.61× 10^-21 cm^2） corresponding to the ^4Ⅰ11/2 →4Ⅰ13/2 transition. The multiphonon relaxation rate for the excited state 4Ⅰ11/2 is only 236 s^-1. Therefore, the excellent spectroscopic properties and outstanding thermal stability suggest that this glass is a suitable host for developing solid-state lasers operating in the mid-infrared.展开更多
基金supported by the National Natural Science Foundation of China(No.60937003)
文摘Glass formation range of Bi2O3-B2O3-TeO2 system has been investigated （B2O3 ≤ 40 mol%）. Four glasses with compositions xBi2O3-B2O3-（70-x）TeO2 （x = 40, 50, 60 and 70 tool%） have been prepared by using melt quenching technique. The effect of Bi2O3 content on thermal stability, optical properties and structures of these four Bi2O3-B2O3-TeO2 glasses is systematically investigated by inductive coupled plasma emission spectrometer （ICP）, differential scanning calorimetry （DSC）, Raman spectra and X-ray photoelectron spectroscopy （XPS）. It is found that the density, refractive index and optical basicity increase with increasing Bi2O3. The Raman spectra and XPS spectra show that the glass network is mainly constituted by the [BiO6] octahedron, [TeO4] trigonal bipyramidal, [TeO3] trigonal pyramid, [BO3] trigonal pyramid and [B04] tetrahedron structural units. With increasing Bi2O3, the coordination number around B atom changes from 3 to 4 and [TeO4] units are converted to [TeO3] units. Bi5＋ ions may exist in Bi2O3-B2O3-TeO2 （BBT） system and their amount grows with increasing Bi2O3 content.
基金supported by the National Natural Science Foundation of China under Grant No. 60937003
文摘An Er3＋-doped lead-free bismuth germanate glass is synthesized. Its 2.7-μm emission property is analyzed, and the efficient 2.7-μm emission from the glass is observed under 980-nm laser diode excitation. The prepared glass possesses high spontaneous transition probability （64.8 s^-1） and a large calculated emission cross section （6.61× 10^-21 cm^2） corresponding to the ^4Ⅰ11/2 →4Ⅰ13/2 transition. The multiphonon relaxation rate for the excited state 4Ⅰ11/2 is only 236 s^-1. Therefore, the excellent spectroscopic properties and outstanding thermal stability suggest that this glass is a suitable host for developing solid-state lasers operating in the mid-infrared.
