Multiplication of electronic excitations and prospects for increasing scintillation efficiency in wide-gap crystals
Creators
- 1. Institute of Physics, University of Tartu, Riia 142, Tartu 51014 (Estonia)
- 2. Institute of Experimental Physics, Hamburg University, Hamburg D-22761 (Germany)
- 3. Department of Physics, Lund University, Lund S 22210 (Sweden)
Description
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 Ev is smaller than the energy gap Eg and hot valence holes are not able to create any secondary e-h pairs. The Ev/Eg 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 α-Al2O3:Mg2+,Ti4+ has been considered
Additional details
Identifiers
- DOI
- 10.1016/j.nima.2004.07.229;
- PII
- S0168-9002(04)01780-2;
Publishing Information
- Journal Title
- Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
- Journal Volume
- 537
- Journal Issue
- 1-2
- Journal Page Range
- p. 45-49
- ISSN
- 0168-9002
- CODEN
- NIMAER
Conference
- Title
- 7. international conference on inorganic scintillators and their use in scientific and industrial applications
- Acronym
- SCINT 2003
- Dates
- 8-12 Sep 2003
- Place
- Valencia (Spain)
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 37033214
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- ALKALI METAL COMPOUNDS; ALUMINIUM OXIDES; ANIONS; CRYSTALS; EFFICIENCY; ENERGY GAP; EV RANGE; EXCITATION; HOLES; IMPURITIES; LUMINESCENCE; MAGNESIUM IONS; PHOSPHORS; PHOTONS; PLASMONS; SCINTILLATIONS; TITANIUM IONS; VALENCE; YIELDS
- Descriptors DEC
- ALUMINIUM COMPOUNDS; BOSONS; CHALCOGENIDES; CHARGED PARTICLES; ELEMENTARY PARTICLES; EMISSION; ENERGY RANGE; ENERGY-LEVEL TRANSITIONS; IONS; MASSLESS PARTICLES; OXIDES; OXYGEN COMPOUNDS; PHOTON EMISSION; QUASI PARTICLES
Optional Information
- Copyright
- Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.