Journal
OPTICAL MATERIALS
Volume 36, Issue 12, Pages 1954-1958Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2014.02.008
Keywords
Lutetium aluminum garnet; Microstructure; Segregation; Luminescence
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Ce3+ doping behaviour in range from 1.0 to 10.0 mol% on Ce:LuAG polycrystalline powders and ceramics was investigated in this paper. It was found that CeO2 would segregate as secondary phase from Ce:LuAG powders when the Ce3+ doping concentration reached to 5.0 mol% under the calcination of 1100 degrees C for 10 h in air. However, this over-doped phenomenon disappeared after the powders being densified into transparent ceramics by vacuum sintering. When the Ce3+ doping concentration was further increased into 10.0 mol%, the CeO2 segregation regions were observed in the corresponding Ce:LuAG ceramic with an elongated rod morphology. The drastic dropping of in-line optical transmittance of the 10.0 mol% Ce:LuAG ceramic demonstrated that the CeO2 secondary phase would form defects and/or electron traps at grain boundaries which embarrassed the energy transfer from host lattice to Ce3+ luminescent centers leading to its poor scintillation property. (C) 2014 Elsevier B.V. All rights reserved.
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