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Multiplication of electronic excitations and prospects for increasing scintillation efficiency in wide-gap crystals

Lushchik, A ; Kirm, M ; Lushchik, C ; Martinson, Indrek LU ; Nagirnyi, V ; Savikhin, F and Vasil'chenko, E (2005) In Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment 537(1-2). p.45-49
Abstract
A comparative analysis of the electron-hole (e-h) excitation mechanism of impurity luminescence has been performed for wide-gap oxides (WGO) and alkali halides crystals (AHC). A low quantum yield of scintillation in WGO with respect to that in AHC is connected with the high value of the average energy needed for the creation of an e-h pair in WGO. In AHC and many WGO, the width of a valence band E, is smaller than the energy gap E, and hot valence holes are not able to create any secondary e-h pairs. The E-v/E-g ratio that describes ''hole losses'' in scintillators is 1.5-2.0 times higher in WGO than in CsI. The scenario of the two-step transformation of an e-h pair or an anion exciton into two emitted photons in alpha-Al2O3:Mg2+, Ti4+ has... (More)
A comparative analysis of the electron-hole (e-h) excitation mechanism of impurity luminescence has been performed for wide-gap oxides (WGO) and alkali halides crystals (AHC). A low quantum yield of scintillation in WGO with respect to that in AHC is connected with the high value of the average energy needed for the creation of an e-h pair in WGO. In AHC and many WGO, the width of a valence band E, is smaller than the energy gap E, and hot valence holes are not able to create any secondary e-h pairs. The E-v/E-g ratio that describes ''hole losses'' in scintillators is 1.5-2.0 times higher in WGO than in CsI. The scenario of the two-step transformation of an e-h pair or an anion exciton into two emitted photons in alpha-Al2O3:Mg2+, Ti4+ has been considered. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
plasmons, scintillation efficiency, luminescence, wide-gap oxides
in
Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
volume
537
issue
1-2
pages
45 - 49
publisher
Elsevier
external identifiers
  • wos:000226737200010
  • scopus:11344271731
ISSN
0167-5087
DOI
10.1016/j.nima.2004.07.229
language
English
LU publication?
yes
id
69231e43-0ecb-4875-95c8-095d4e0c2bb7 (old id 254151)
date added to LUP
2016-04-01 16:08:23
date last changed
2022-01-28 17:33:40
@article{69231e43-0ecb-4875-95c8-095d4e0c2bb7,
  abstract     = {{A comparative analysis of the electron-hole (e-h) excitation mechanism of impurity luminescence has been performed for wide-gap oxides (WGO) and alkali halides crystals (AHC). A low quantum yield of scintillation in WGO with respect to that in AHC is connected with the high value of the average energy needed for the creation of an e-h pair in WGO. In AHC and many WGO, the width of a valence band E, is smaller than the energy gap E, and hot valence holes are not able to create any secondary e-h pairs. The E-v/E-g ratio that describes ''hole losses'' in scintillators is 1.5-2.0 times higher in WGO than in CsI. The scenario of the two-step transformation of an e-h pair or an anion exciton into two emitted photons in alpha-Al2O3:Mg2+, Ti4+ has been considered.}},
  author       = {{Lushchik, A and Kirm, M and Lushchik, C and Martinson, Indrek and Nagirnyi, V and Savikhin, F and Vasil'chenko, E}},
  issn         = {{0167-5087}},
  keywords     = {{plasmons; scintillation efficiency; luminescence; wide-gap oxides}},
  language     = {{eng}},
  number       = {{1-2}},
  pages        = {{45--49}},
  publisher    = {{Elsevier}},
  series       = {{Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment}},
  title        = {{Multiplication of electronic excitations and prospects for increasing scintillation efficiency in wide-gap crystals}},
  url          = {{http://dx.doi.org/10.1016/j.nima.2004.07.229}},
  doi          = {{10.1016/j.nima.2004.07.229}},
  volume       = {{537}},
  year         = {{2005}},
}