期刊
JOURNAL OF APPLIED PHYSICS
卷 112, 期 2, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4739722
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资金
- National Science Foundation [DMR 1006772]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1006772] Funding Source: National Science Foundation
Shallow traps that affect exciton dynamics in undoped and Ce doped yttrium aluminum garnet (CeYAG) single crystals were studied by low temperature thermo-luminescence spectroscopy. The nature of traps was identified and their energy levels in the band gap were measured. Three types of traps were found: two very shallow traps with activation energy of less than 0.2 eV associated with electronic defects, one trap with activation energy of 0.5 eV associated with oxygen vacancies, and one relatively deeper trap with activation energy of 0.7 eV associated with hydrogen impurities. The association of oxygen vacancies with shallow traps as evident from this work and with deep traps as reported by Varney et al. [J. Appl. Phys. 111, 063505 (2012)] suggest their presence in the lattice in more than one charge state. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4739722]
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