Multiplication of electronic excitations and prospects for increasing scintillation efficiency in wide-gap crystals
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/254151
- author
- Lushchik, A ; Kirm, M ; Lushchik, C ; Martinson, Indrek LU ; Nagirnyi, V ; Savikhin, F and Vasil'chenko, E
- organization
- publishing date
- 2005
- 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}}, }