Feng Li, Zhang Jianhui, Wang Jing, Liang Hongbin, Su Qiang
State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2007 Jul;67(3-4):886-9. doi: 10.1016/j.saa.2006.09.004. Epub 2006 Sep 10.
In this report, we investigate the cooperative energy transfer frequency upconversion in Tb3+/Yb3+-codoped SiO2-Al(2)O(3)-Na2O-ZnF(2) oxyfluoride glasses under 980 nm diode laser excitation. The influence of both Tb3+ and Yb3+ concentration on the emission bands were investigated. With a lower Tb3+ concentration, the emission bands around 381, 416 and 438 nm, and 489, 545, 587 and 623 nm associated with (5)D(3), (5)G(6)-->(7)F(J) (J=6, 5, 4) and (5)D(4)-->(7)F(J) (J=6, 5, 4, 3) transitions were observed. However, only (5)D(4)-->(7)F(J) (J=6, 5, 4, 3) transitions appear in a higher Tb3+ concentration. The integrated upconversion luminescence intensity was examined when the temperature of sample was varied from 40 to 450 K. The dependence of the upconversion emission intensity upon the excitation power was also examined, and the upconversion mechanisms were discussed.
在本报告中，我们研究了在980 nm二极管激光激发下，掺Tb3+/Yb3+的SiO2-Al₂O₃-Na₂O-ZnF₂氟氧化物玻璃中的合作能量转移频率上转换。研究了Tb3+和Yb3+浓度对发射带的影响。在较低的Tb3+浓度下，观察到与(5)D₃、(5)G₆→(7)F_J（J = 6, 5, 4）以及(5)D₄→(7)F_J（J = 6, 5, 4, 3）跃迁相关的381、416和438 nm以及489、545、587和623 nm附近的发射带。然而，在较高的Tb3+浓度下，仅出现(5)D₄→(7)F_J（J = 6, 5, 4, 3）跃迁。当样品温度在40至450 K之间变化时，检测了积分上转换发光强度。还研究了上转换发射强度对激发功率的依赖性，并讨论了上转换机制。
