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Title: Nonlinear luminescence response of CaF{sub 2}:Eu and YAlO{sub 3}:Ce to single-ion excitation

Understanding scintillation physics and nonproportionality is essential to accelerate materials discovery that has been restricted due to the difficulties inherent to large crystal growth and complex nature of gamma-solid interaction. Taking advantage of less restrictive growth and deposition techniques for smaller crystal sizes or thin films and better fundamental understanding of ion-solid interactions, a unique ion approach is demonstrated to effectively screen candidate scintillators with relatively small size and evaluate their nonlinear scintillation response. Response of CaF{sub 2}:Eu and YAlO{sub 3}:Ce scintillators to single ions of H{sup +}, He{sup +}, and O{sup 3+} are measured by the corresponding pulse height over a continuous energy range using a time-of-flight–scintillator–photoelectric multiplier tube apparatus. Nonlinear response of the scintillators under ionizing ion irradiation is quantitatively evaluated by considering the energy partitioning process. In a differential energy deposition region with negligible displacement damage, the low, medium and high excitation energy deposition density (D{sub exci}) can be produced by energetic H{sup +}, He{sup +} and O{sup 3+} ions, respectively, and significantly different impacts on the response characteristics of these two benchmark scintillators are observed. For CaF{sub 2}:Eu, the scintillation efficiency under ion irradiation monotonically decreases with increasing excitation-energy density. In contrast, the response efficiency ofmore » YAlO{sub 3}:Ce scintillation initially increases with excitation-energy density at low excitation-energy densities, goes through a maximum, and then decreases with further increasing excitation-energy density. The fundamental mechanism causing these different response behaviours in the scintillators is based on the competition between the scintillation response and the nonradiative quenching process under different excitation densities, which is also the main origin of the nonlinear response of the scintillators to irradiation.« less
Authors:
 [1] ;  [2] ; ;  [1] ;  [3] ;  [1] ;  [4] ;  [5]
  1. Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996 (United States)
  2. (MOE), Shandong University, Jinan 250100 (China)
  3. (United States)
  4. School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054 (China)
  5. School of Physics, Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Jinan 250100 (China)
Publication Date:
OSTI Identifier:
22275830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINATES; CALCIUM FLUORIDES; CRYSTAL GROWTH; CRYSTALS; ELECTRON MULTIPLIERS; ENERGY ABSORPTION; ENERGY DENSITY; ENERGY LOSSES; EXCITATION; HELIUM IONS; HYDROGEN IONS 1 PLUS; IRRADIATION; LUMINESCENCE; NONLINEAR PROBLEMS; PHOSPHORS; SCINTILLATIONS; THIN FILMS; YTTRIUM COMPOUNDS