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

被引：7
作者：
Lushchik, A
Kirm, M
Lushchik, C
Martinson, I
Nagirnyi, V
Savikhin, F
Vasil'chenko, E
机构：
[1] Univ Tartu, Inst Phys, EE-51014 Tartu, Estonia
[2] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany
[3] Lund Univ, Dept Phys, S-22210 Lund, Sweden
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2005年 / 537卷 / 1-2期
关键词：
luminescence; plasmons; scintillation efficiency; wide-gap oxides;
D O I：
10.1016/j.nima.2004.07.229
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
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. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：45 / 49
页数：5
相关论文
共 21 条
  • [1] ALEKSANDROV Y, 1982, T I FIZ AKAD NAUK ES, V53, P7
  • [2] Efficiency of electron-hole pair production in scintillators
    Bartram, RH
    Lempicki, A
    [J]. JOURNAL OF LUMINESCENCE, 1996, 68 (05) : 225 - 240
  • [3] ENERGIEVERLUSTSPEKTREN DER ALKALIHALOGENIDE UND DER METALLE CU AG UND AU UND VERGLEICH MIT OPTISCHEN MESSUNGEN
    CREUZBUR.M
    [J]. ZEITSCHRIFT FUR PHYSIK, 1966, 196 (05): : 433 - &
  • [4] DENKS VP, 1969, SOV PHYS-SOLID STATE, V11, P32
  • [5] Quantum efficiency of down-conversion phosphor LiGdF4:Eu
    Feldmann, C
    Jüstel, T
    Ronda, CR
    Wiechert, DU
    [J]. JOURNAL OF LUMINESCENCE, 2001, 92 (03) : 245 - 254
  • [6] ILMAS ER, 1965, OPT SPECTROSC-USSR, V18, P255
  • [7] ILMAS ER, 1965, OPT SPECTROSC-USSR, V18, P359
  • [8] FUNDAMENTAL LIMITS OF SCINTILLATOR PERFORMANCE
    LEMPICKI, A
    WOJTOWICZ, AJ
    BERMAN, E
    [J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1993, 333 (2-3) : 304 - 311
  • [9] Spectral transformers of VUV radiation on the basis of wide-gap oxides
    Lushchik, A
    Lushchik, C
    Kotlov, A
    Kudryavtseva, I
    Maaroos, A
    Nagirnyi, V
    Vasil'chenko, E
    [J]. RADIATION MEASUREMENTS, 2004, 38 (4-6) : 747 - 752
  • [10] Fast intrinsic emissions of wide-gap oxides under electron irradiation
    Lushchik, A
    Savikhin, F
    Tokbergenov, I
    [J]. RADIATION EFFECTS AND DEFECTS IN SOLIDS, 2003, 158 (1-6): : 305 - 308
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