Scintillation activated by nanoparticle formation in CsI:Na thin films

被引:11
作者
Nakayama, M
Ando, N
Hirai, J
Nishimura, H
机构
[1] Osaka City Univ, Fac Engn, Dept Appl Phys, Sumiyoshi Ku, Osaka 5588585, Japan
[2] Kansai Gaidai Univ, Hirakata, Osaka 5730195, Japan
关键词
CsI : Na; scintillation; nanoparticle; self-trapped exciton;
D O I
10.1016/j.jlumin.2004.01.076
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The scintillation mechanism in Na-doped CsI (CsI:Na) crystalline thin films grown by vacuum deposition has been investigated from the aspects of optical and structural properties. It is found that a heat treatment of the thin film activates the Na-related luminescence corresponding to the dominant scintillation in a CsI:Na crystal. The surface morphology of the thin films measured by atomic force microscope demonstrates that the heat treatment causes the formation of nanoparticles. From the excitation spectrum of the Na-related luminescence and the temperature dependence of the luminescence properties, it is concluded that the scintillation of CsI:Na is caused by the energy transfer from the host material of CA to NaI nanoparticles. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:359 / 363
页数:5
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