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- Title
Study on the mechanism of afterglow in CsI: Tl and the afterglow suppression in CsI: Tl, Eu.
- Authors
Tian, Chunhui; Liu, Shuang; Xie, Yijun; Guo, Lina; Chen, Dejun; Liu, Yong; Zhong, Zhiyong
- Abstract
Although there are many new scintillators being developed recently, CsI: Tl is still a very efficient one among them. However it suffers from afterglow which limits application in high-speed x-ray imaging. In order to find out the mechanism of afterglow and the method to suppress afterglow in CsI: Tl, the theoretical model of perfect CsI, CsI: Tl and CsI: Tl, Eu are built by the software Material Studio. The total and partial density of states of these three models is calculated within the framework of generalized gradient approximation and ultra-soft pseudo-potential. The results indicate that the generation of afterglow in CsI: Tl is due to the impurity energy bands introduced by Tl. Moreover, co-doping CsI: Tl with Eu will introduce deeper impurity energy bands which can effectively scavenge the electrons trapped by the shallow impurity energy bands introduced by Tl, thus suppressing the afterglow in CsI: Tl.
- Subjects
ENERGY bands; DENSITY of states; ELECTRON traps; X-ray imaging; SCINTILLATORS; CONSTRUCTION materials
- Publication
Journal of Radioanalytical & Nuclear Chemistry, 2019, Vol 320, Issue 1, p123
- ISSN
0236-5731
- Publication type
Article
- DOI
10.1007/s10967-019-06442-8