中国物理B ›› 2010, Vol. 19 ›› Issue (7): 77804-077804.doi: 10.1088/1674-1056/19/7/077804
韦先涛, 赵江波, 陈永虎, 尹民, 李勇
Wei Xian-Tao(韦先涛), Zhao Jiang-Bo(赵江波), Chen Yong-Hu(陈永虎), Yin Min(尹民)†, and Li Yong(李勇)
摘要: Bi3+ and Yb3+ codoped cubic Y2O3 phosphors are prepared by pechini sol—gel method. Strong near-infrared (NIR) emission around 980 nm from Yb3 + (2F5 / 2 → 2F7 / 2) is observed under ultraviolet light excitation. A broad excitation band ranging from 320 to 360 nm, owing to the 6s2 → 6s6p transition of Bi3 + ions, is recorded when the Yb3 + emission is monitored, which suggests a very efficient energy transfer from Bi3 + ions to Yb3 + ions. The Yb3 + concentration dependences of both the Bi3 + and the Yb3 + emissions are investigated. The decay curve of Bi3 + emission under the excitation of 355 nm pulse laser is used to explore the Bi3 + → Yb3 + energy transfer process. Cooperative energy transfer (CET) is discussed as a possible mechanism for the near-infrared emission.
中图分类号: (Other solid inorganic materials)