Properties of Local Structure Surrounding Eu3+ Ion in Various Niobate-Silicate Glasses
来源期刊：JOURNAL OF RARE EARTHS2003年第4期
论文作者：吕少哲 张家骅 夏海平 宋宏伟 王绩伟 许武
Key words：optics; Eu3+ doped niobat-silicate glass; intensity parameters; lifetime; phonon-side bands; crystal field parameters; rare earths;
Abstract: A Series of niobate-silicate glasses doped with Eu3+ ions were prepared. The emission, phonon-side band spectra, fluorescence line narrowing spectroscopy and fluorescence lifetimes in these glasses were studied. The intensity parameters and crystal field parameter of Eu3+ were obtained. The results indicate that the intensity ratio of the electric-dipole to magnetic-dipole transition and the intensity parameter Ω2 increase with the increasing concentration of Nb2O5, indicating that the symmetry becomes lower, the Eu-O bonds become stronger and the covalency of Eu-O bond increases. The value of B20 decreases with the increasing concentration of Nb2O5, indicating that the distance between the Eu3+ ion and oxygen decreases and the Eu-O bond becomes strong, corresponding to the results of the former. As the concentration of Nb2O5 increases, the electron-phonon coupling becomes stronger, thus the nonradiative transition rate of 5D0 becomes larger and the lifetime of 5D0 becomes shorter.
吕少哲1，张家骅1，夏海平2，宋宏伟1，王绩伟1，许武1
(1.Key Laboratory of Excited State Physics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130022, China;
2.Laboratory of Photoelectric Materials, Ningbo University, Ningbo 315211, China)
Abstract:A Series of niobate-silicate glasses doped with Eu3+ ions were prepared. The emission, phonon-side band spectra, fluorescence line narrowing spectroscopy and fluorescence lifetimes in these glasses were studied. The intensity parameters and crystal field parameter of Eu3+ were obtained. The results indicate that the intensity ratio of the electric-dipole to magnetic-dipole transition and the intensity parameter Ω2 increase with the increasing concentration of Nb2O5, indicating that the symmetry becomes lower, the Eu-O bonds become stronger and the covalency of Eu-O bond increases. The value of B20 decreases with the increasing concentration of Nb2O5, indicating that the distance between the Eu3+ ion and oxygen decreases and the Eu-O bond becomes strong, corresponding to the results of the former. As the concentration of Nb2O5 increases, the electron-phonon coupling becomes stronger, thus the nonradiative transition rate of 5D0 becomes larger and the lifetime of 5D0 becomes shorter.
Key words:optics; Eu3+ doped niobat-silicate glass; intensity parameters; lifetime; phonon-side bands; crystal field parameters; rare earths;
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