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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
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
2007-08-20 08:25:54
date last changed
2017-01-01 06:56:46
@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},
  keyword      = {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},
  volume       = {537},
  year         = {2005},
}