Ce_(3+)、Tb~(3+)激活的LaBO_3的发光性能和能量传递

本文系统地研究了在紫外光、阴极射线和X射线激发条件下Ce~(3+)、Tb~(3+)及Ce~(3+)和Tb~(3+)共激活的LaBO_3体系的发光性能及组成对Ce~(3+)和Tb~(3+)发射强度的影响。结果表明:在254nm紫外光激发下Ce~(+3)对Tb~(3+)有良好的敏化作用;并确定了Ce~(3+)→Tb~(3+)的能量传送机理为偶极子—偶极子相互作用的共振传递;能量传送效率最高可达100％.在200nm紫外光、阴极射线和X射线激发条件下Ce~(3+)对Tb~(3+)的发光起猝灭作用。确定了在378nm紫外光激发条件下Tb~(3+)在La_(1-y)Tb_yBO_3体系中的浓度猝灭机理为电偶极—电偶极相互作用。

Luminescence and Energy Transfer of Ce~3+ and Tb~3+ in LaBO_3

This paper reports the results of a systematic investigation on luminescent properties of Ce3+- and Tb3+- activated LaBO3 under the excitation of TV light,CR or X-ray. A detailed study of the influence of the composition on the intensity of Ce3+ and Th3+ emissions has also been presented. The concentration quenching of Tb3+ emission has-been studied too. We conclude that dipole-dipole interaction is the possible mechanism. Energy transfer from Ce3+ to Tb3+ is observed in the Ce3+ and Tb3+ codpped sample under the excitation of 254nm UV light. Our experimental results indicate that electrical multipolar interaction is the predominant mechanism for the energy transfer. The-maximal efficiency of the energy transfer approaches 100%. It means that La1-x-yCex, TbyBO3 is a better photoluminescent material. Under the excitation of CR and X-ray3, Tb3+ emission is quenching by Ce3+.