The phosphate glasses doped with Eu2＋, Gd3＋, respectively, and co-doped with Gd3＋ and Eu2＋ were prepared by high-temperature melting method. The transmission spectra, the excitation spectra, the emission spectra a...The phosphate glasses doped with Eu2＋, Gd3＋, respectively, and co-doped with Gd3＋ and Eu2＋ were prepared by high-temperature melting method. The transmission spectra, the excitation spectra, the emission spectra and the fluorescent decay time were investigated. The energy transfer process between Gd3＋ and Eu2＋ was studied. From the excitation spectra and the emission spectra of the phosphate glasses doped with Eu2＋, we observed that the emission intensity of Eu2＋ shows higher for 0.02 mol% Eu2＋-doped phosphate glass. According to the excitation spectra and the emission spectra and the fluorescence decay curves, when the concentration of Eu2＋ was 0.02 mol%, the optimal con- centration of Gd3＋ was 0.3 tool%. Based on Dexter theory, it is shown that the energy transfer between Gd3＋ and Eu2＋ was nonradiation energy transfer by analyzing the energy-level diagram. The fluorescence decay curves of Gd3＋ were expressed by the Inokuti-Hirayama＇s model and were used to analyze energy transfer mechanism between Gd3＋ and Eu2＋. And the energy transfer efficiency was also calculated.展开更多
基金financially supported by the National Natural Science Foundation of China (Nos.61275180 and 51472125)the Natural Science Foundation of Ningbo City (No.2013A610126)+1 种基金the Outstanding Dissertation Growth Foundation of Ningbo University (No.PY2013009)the K.C.Wong Magna Fund in Ningbo University
文摘The phosphate glasses doped with Eu2＋, Gd3＋, respectively, and co-doped with Gd3＋ and Eu2＋ were prepared by high-temperature melting method. The transmission spectra, the excitation spectra, the emission spectra and the fluorescent decay time were investigated. The energy transfer process between Gd3＋ and Eu2＋ was studied. From the excitation spectra and the emission spectra of the phosphate glasses doped with Eu2＋, we observed that the emission intensity of Eu2＋ shows higher for 0.02 mol% Eu2＋-doped phosphate glass. According to the excitation spectra and the emission spectra and the fluorescence decay curves, when the concentration of Eu2＋ was 0.02 mol%, the optimal con- centration of Gd3＋ was 0.3 tool%. Based on Dexter theory, it is shown that the energy transfer between Gd3＋ and Eu2＋ was nonradiation energy transfer by analyzing the energy-level diagram. The fluorescence decay curves of Gd3＋ were expressed by the Inokuti-Hirayama＇s model and were used to analyze energy transfer mechanism between Gd3＋ and Eu2＋. And the energy transfer efficiency was also calculated.
