Role of Lithium Codoping in Enhancing the Scintillation Yield of Aluminate Garnets
Journal Article
·
· Physical Review Applied
- Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Ceramics, Artificial Crystal Research Center
- North Carolina State Univ., Raleigh, NC (United States). Dept. of Nuclear Engineering
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; East China Normal Univ. (ECNU), Shanghai (China). Key Lab. of Polar Materials and Devices (Ministry of Education) and Dept. of Physics
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
- Beihang Univ., Beijing (China). School of Materials Science & Engineering,
- Univ. of Tennessee, Knoxville, TN (United States). Scintillation Materials Research Center and Dept. of Materials Science and Engineering
- North Carolina State Univ., Raleigh, NC (United States). Dept. of Nuclear Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
- Univ. of Tennessee, Knoxville, TN (United States). Scintillation Materials Research Center
- Univ. of Tennessee, Knoxville, TN (United States). Scintillation Materials Research Center, Dept. of Materials Science and Engineering, Dept. of Nuclear Engineering, and Bredesen Center for Interdisciplinary Research and Graduate Education
The aim of this work is to clarify the scintillation-yield enhancement in scintillators obtained by codoping via integrated study of the valence state of activators, the preferential site occupancy of codopants, and defect structures from experimental and theoretical insights. Here, with codoping, the light yield and energy resolution of samples are improved from 156000 to 248000 photons/MeV, and 5.3 to 4.3% at 662 keV,respectively.The optical absorption spectra indicate that codoping does not induce conversion of stable to in single crystals. Based on the formation energies of substitutional and interstitial sites using density-functional-theory (DFT) calculations and the nuclear magnetic resonance results, it is shown that the ions prefer to dominantly occupy the fourfold coordinated interstitial sites and fourfold coordinated sites. The systematic analysis of thermoluminescence glow curves, positron annihilation lifetime spectroscopies, and defect formation energies derived from DFT calculations reveals that the concentration of isolated and vacancies as dominant acceptor defects is reduced by codoping, whilst the shallow interstitial defects and the deep oxygen vacancies are introduced simultaneously. We propose that the lowering of hole trapping at defects resulting from codoping contributes to the scintillation-yield enhancement.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- Chinese Academy of Sciences; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1649422
- Journal Information:
- Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 6 Vol. 13; ISSN 2331-7019
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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