Ce^(3+)/Er^(3+)/Yb^(3+)共掺锑硅酸盐玻璃的光谱性质

Spectroscopic Properties of Ce^(3+)/Er^(3+)/Yb^(3+) Codoped Antimony-silicate Glasses

研究了能量接受离子Ce3+对Er3+离子上转换荧光强度以及1.5μm荧光特性的影响。根据Ce3+和Er3+离子的能级结构按能量匹配原理对Er3+/Yb3+/Ce3+共掺杂的锑硅酸盐玻璃中稀土离子间的能量转移机制进行了分析。分析表明,Er3+离子在4I11/2能级上通过无辐射驰豫将能量传递给Ce3+离子,使Ce3+离子由基态2F5/2能级跃迁至2F7/2能级,而Er3+离子则由4I11/2能级无辐射跃迁至4I13/2能级,从而有效降低锑硅酸盐玻璃中Er3+的上转换发光。实验结果显示,当Er3+浓度为1.81×10-20cm-3时,Ce3+的最佳掺杂浓度为1.08×10-20cm-3,此时Ce3+的引入不仅可以降低上转换发光,而且有效提高Er3+离子在1.5μm的荧光强度和4I13/2能级荧光寿命。

This paper reports on the influence of energy acceptors Ce^3＋ ions on the upconversion and 1.5 μm emiasion properties of antimony-silicate glasses eodoped with Er^3＋/Yb^3＋ . The energy transfer mechanism has been discussed based on the energy matching and the energy levels. The Ce^3＋ ions are excited from the ^2F5/2 level to the ^2F7/2 level due to the non-radiatively energy transfer process of the Er^3＋ ions from the ^4I11/2 level to the ^4I13/2 level. The upconversion luminescence intensity of the Er^3＋ is decreased quite significantly owing to this energy transfer process, while the luminescence intensity at 1.5 μm increases. The luminescence intensities and the lifetimes of the ^4I13/2 level of Er^3＋ ions increase largely with the introduction of the Ce^3＋ ions at the proper concentration of 1.08 × 10^-20cm^-3.