发光学报, 2011, 32 (4): 319, 网络出版: 2011-04-28
Yb3+,Er3+掺杂的SrAl2O4∶Eu2+,Dy3+长余辉材料的发光特性
Long-persistent Luminescent Properties of SrAl2O4∶Eu2+,Dy3+ Doped with Yb3+ and Er3+
摘要
根据Dorenbos能级模型的推论, 利用掺杂Yb3+和Er3+对典型的长余辉材料SrAl2O4∶Eu2+,Dy3+(简称SAO∶ED)的发光特性(发光强度和余辉时间)进行调制。在发光特性分析中, 发展并使用了一种简便易行的解析模型, 而不是常用的多项e指数衰减函数的经验模型。研究发现, 正如Dorenbos所预言的, Yb3+掺杂确实能够提高SAO∶ED的发光强度; 但进一步研究发现, Yb3+不完全是发光中心, 而是一种辅助激发中心。Er3+掺杂效果也和Dorenbos的预言相同, 即它是一种俘获中心; 但是当Er3+和Yb3+共掺杂时, Er3+却有一种脱俘作用, 使得初始发光强度增强, 衰减常数变小, 但蓄光能力变化不大。
Abstract
The long-persistent properties of the phosphor SrAl2O4∶Eu2+,Dy3+ (or SAO∶ED) have been modulated by doping with Yb3+ or/and Er3+ according to the energy-level model proposed recently by Dorenbos. To analyze the decay process, we use a new developed analytical model instead of the usually adopted empirical one. The decay curves have been analyzed by this model. It is found that the doped Yb3+ does enhance the light-emitting intensity of SAO∶ED as predicted by Dorenbos, yet it acts not as a light-emitting center, but as an auxiliary excitation center. In consistent with Dorenbos prediction, the doped Er3+ does act as a trap center. But when SAO∶ED is co-doped with Er3+ and Yb3+, Er3+ plays a role,which exerts an effect of re-trapping, increases the initial light-emitting intensity and reduces the decay time, but the figure of merit of light-emitting does not change significantly.
郝洪辰, 陈斌, 朱江, 陆明. Yb3+,Er3+掺杂的SrAl2O4∶Eu2+,Dy3+长余辉材料的发光特性[J]. 发光学报, 2011, 32(4): 319. HAO Hong-chen, CHEN Bin, ZHU Jiang, LU Ming. Long-persistent Luminescent Properties of SrAl2O4∶Eu2+,Dy3+ Doped with Yb3+ and Er3+[J]. Chinese Journal of Luminescence, 2011, 32(4): 319.