Enhancement in optical absorption of CsI(Na)

Wei Cheng; Pei-Sheng Liu; Min-Ju Ying; Feng-Shou Zhang

doi:10.1007/s41365-022-01020-2

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Enhancement in optical absorption of CsI(Na)

NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH | Updated：2022-05-17

- Enhancement in optical absorption of CsI(Na)
- Nuclear Science and Techniques Vol. 33, Issue 3, Article number: 29(2022)
- Affiliations：
  
  1.Key laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
  2.Institute of Radiation Technology, Beijing Academy of Science and Technology, Beijing 100875, China
  3.Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China
- Author bio：
  
  chengwei@bnu.edu.cn (W. Cheng)
  fszhang@bnu.edu.cn (F.S. Zhang)
- Funds：
- DOI：10.1007/s41365-022-01020-2
  CLC：
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Wei Cheng, Pei-Sheng Liu, Min-Ju Ying, et al. Enhancement in optical absorption of CsI(Na). [J]. Nuclear Science and Techniques 33(3):29(2022)
DOI：

Wei Cheng, Pei-Sheng Liu, Min-Ju Ying, et al. Enhancement in optical absorption of CsI(Na). [J]. Nuclear Science and Techniques 33(3):29(2022) DOI： 10.1007/s41365-022-01020-2.

摘要

Abstract

Discussions pertaining to enhancement in the luminous efficiency of cesium iodide (CsI) detectors doped with sodium (Na) abound. In this study, the defect structure of one Cs atom replaced by one Na atom is calculated using the ab initio method. Subsequently, the electronic band structures, densities of states, optical absorption spectra, phonons, and transport properties of CsI in perfect and defective structures are investigated. The absorption spectra of CsI with and without Na impurities are compared. It is discovered that the impurity levels in the forbidden band are generated from the shell electron distributions of the impurity atoms, not from lattice distortions. Furthermore, it is discovered that the optical absorption can be enhanced by doping CsI with Na.

关键词

Keywords

CsINa impurityBand structurePhononAbsorption spectrum

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