Effect of retrapping on photostimulated luminescence in Sr3SiO5:Eu2+, Dy3+ phosphor
Effect of retrapping on photostimulated luminescence in Sr3SiO5:Eu2+, Dy3+ phosphor
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DOI：
10.1063/1.3050330
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发表时间：
2009-01
影响因子：
3.2
通讯作者：
Xiaoyuan Sun;Jiahua Zhang;Xia Zhang;Yongshi Luo;Z. Hao;Xiaojun Wang
中科院分区：
文献类型：
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作者：
Xiaoyuan Sun;Jiahua Zhang;Xia Zhang;Yongshi Luo;Z. Hao;Xiaojun Wang
Sr_3SiO_5：Eu~(2+)，Dy~(3+)在紫外光照射下表现出强烈的橙色磷光和光激励发光，源于Eu~(2+)的4f65d-4f7跃迁。从热释光光谱和磷光衰减曲线可以看出，浅陷阱和深陷阱由一个很快的成分和一个很慢的成分组成。当开启和关闭808 nm处的红外激发时，光激励发光分别呈现缓慢上升和下降沿。通过对深陷阱光激励退居过程中光激励发光的动力学过程的分析，认为这是浅陷阱对电子的再捕获的结果。在光刺激关闭和开启之间的时间间隔内，也显示了被深陷阱重新捕获的电子，这导致相对于之前的下降沿有一个增强的上升沿。
Sr3SiO5:Eu2+, Dy3+ exhibits a strong orange phosphorescence and photostimulated luminescence, originating from 4f65d-4f7 transition of Eu2+, after ultraviolet exposure. Shallow and deep traps are evidenced by thermoluminescence spectrum and decay curve of phosphorescence, which consists of a very fast and a slow component. The photostimulated luminescence presents a slow rising and a falling edge as an infrared excitation at 808 nm is turned on and off, respectively. This is attributed to the result of electron retrapping by shallow traps based on the analysis of dynamical process in photostimulated luminescence involved in photostimulated depopulation of deep traps. The electrons retrapped by deep traps is also demonstrated in the time interval between photostimulation off and on, which results in an enhanced rising edge relative to the former falling edge.