期刊
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
卷 9, 期 4, 页码 245-249出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201510047
关键词
hole traps; optical ceramics; garnet scintillators; electron spin resonance; density functional theory
资金
- National Science Foundation of China [11005139, U1332202]
- Research Program of Shanghai Sciences and Technology Commission Foundation [13JC1405800, 11JC1412400]
- Chinese Academy of Sciences Visiting Professorship For Senior International Scientists [2013T2G0004]
- Czech Science Foundation [P204/12/0805]
Electron traps are known to a have great influence on the carriers transport process in Ce based scintillators. On the other hand, the role of hole traps in the scintillation process has been less considered. By means of electron spin resonance (ESR), we detected hole traps in highly Ce-doped LuAG: Ce,Mg ceramics in the form of sigma-type O- centers. The g-tensor components turn out to be g(1) = 2.0103, and g parallel to = 2.0023, revealing the axial symmetry of these defects. Mg-perturbed variants of O- centers are proposed to exist in LuAG: Ce,Mg. Their occurrence is related to an elongated Mg-O bond as evidenced by DFT calculations. Finally, the multiple role of O-centers in the scintillation process is discussed. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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