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Title: Excitons in scintillator materials: Optical properties and electron-energy loss spectra of NaI, LaBr 3 , BaI 2 , and SrI 2

Abstract

In this paper, materials for scintillator radiation detectors need to fulfill a diverse set of requirements such as radiation hardness and highly specific response to incoming radiation, rendering them a target of current materials design efforts. Even though they are amenable to cutting-edge theoretical spectroscopy techniques, surprisingly many fundamental properties of scintillator materials are still unknown or not well explored. In this work, we use first-principles approaches to thoroughly study the optical properties of four scintillator materials: NaI, LaBr3, BaI2, and SrI2. By solving the Bethe–Salpeter equation for the optical polarization function we study the influence of excitonic effects on dielectric and electron-energy loss functions. This work sheds light into fundamental optical properties of these four scintillator materials and lays the ground-work for future work that is geared toward accurate modeling and computational materials design of advanced radiation detectors with unprecedented energy resolution.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1507593
Alternate Identifier(s):
OSTI ID: 1438725
Report Number(s):
LLNL-JRNL-700065
Journal ID: ISSN 0884-2914; PII: S0884291416003952
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Published Article
Journal Name:
Journal of Materials Research
Additional Journal Information:
Journal Name: Journal of Materials Research Journal Volume: 32 Journal Issue: 1; Journal ID: ISSN 0884-2914
Publisher:
Cambridge University Press (CUP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; electronic structure; optical properties; electron energy loss spectroscopy (EELS)NiAl

Citation Formats

Schleife, André, Zhang, Xiao, Li, Qi, Erhart, Paul, and Åberg, Daniel. Excitons in scintillator materials: Optical properties and electron-energy loss spectra of NaI, LaBr 3 , BaI 2 , and SrI 2. United States: N. p., 2016. Web. doi:10.1557/jmr.2016.395.
Schleife, André, Zhang, Xiao, Li, Qi, Erhart, Paul, & Åberg, Daniel. Excitons in scintillator materials: Optical properties and electron-energy loss spectra of NaI, LaBr 3 , BaI 2 , and SrI 2. United States. https://doi.org/10.1557/jmr.2016.395
Schleife, André, Zhang, Xiao, Li, Qi, Erhart, Paul, and Åberg, Daniel. Thu . "Excitons in scintillator materials: Optical properties and electron-energy loss spectra of NaI, LaBr 3 , BaI 2 , and SrI 2". United States. https://doi.org/10.1557/jmr.2016.395.
@article{osti_1507593,
title = {Excitons in scintillator materials: Optical properties and electron-energy loss spectra of NaI, LaBr 3 , BaI 2 , and SrI 2},
author = {Schleife, André and Zhang, Xiao and Li, Qi and Erhart, Paul and Åberg, Daniel},
abstractNote = {In this paper, materials for scintillator radiation detectors need to fulfill a diverse set of requirements such as radiation hardness and highly specific response to incoming radiation, rendering them a target of current materials design efforts. Even though they are amenable to cutting-edge theoretical spectroscopy techniques, surprisingly many fundamental properties of scintillator materials are still unknown or not well explored. In this work, we use first-principles approaches to thoroughly study the optical properties of four scintillator materials: NaI, LaBr3, BaI2, and SrI2. By solving the Bethe–Salpeter equation for the optical polarization function we study the influence of excitonic effects on dielectric and electron-energy loss functions. This work sheds light into fundamental optical properties of these four scintillator materials and lays the ground-work for future work that is geared toward accurate modeling and computational materials design of advanced radiation detectors with unprecedented energy resolution.},
doi = {10.1557/jmr.2016.395},
journal = {Journal of Materials Research},
number = 1,
volume = 32,
place = {United States},
year = {Thu Nov 03 00:00:00 EDT 2016},
month = {Thu Nov 03 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1557/jmr.2016.395

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