摘要
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。
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+.
出处
《北京大学学报（自然科学版）》
CAS
CSCD
北大核心
1990年第2期191-199,共9页
Acta Scientiarum Naturalium Universitatis Pekinensis
基金
国家自然科学基金
