| 【文章摘要】 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 concentration of Gd3+was 0.3 mol%.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. |