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Cerium-doped lutetium aluminum garnet optically transparent ceramics fabricated by a sol-gel combustion process

Published online by Cambridge University Press:  01 June 2006

Xue-Jian Liu*
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People's Republic of Chinaand Advanced Materials Laboratory, National Institute for Materials Sciences (NIMS), Tsukuba, Ibaraki 305-0044, Japan
Hui-Li Li
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China
Rong-Jun Xie
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Sciences (NIMS), Tsukuba, Ibaraki 305-0044, Japan
Naoto Hirosaki
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Sciences (NIMS), Tsukuba, Ibaraki 305-0044, Japan
Xin Xu
Affiliation:
Advanced Materials Laboratory, National Institute for Materials Sciences (NIMS), Tsukuba, Ibaraki 305-0044, Japan
Li-Ping Huang
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China
*Corresponding
a) Address all correspondence to this author. e-mail: xjliu@mail.sic.ac.cn
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Abstract

Nano-sized cerium-doped lutetium aluminum garnet (LuAG:Ce) powders were prepared via a sol-gel combustion process from a mixed solution of metal nitrates, using organic glycine as a fuel. The purified crystalline phase of LuAG:Ce was obtained after calcination at 1000 °C for 2 h. The obtained phosphors were agglomerated and had a foamy-like morphology, consisting of pointed crystallites with uniform size of about 40 nm. Both the photoluminescence and the radioluminescence of the calcined powders showed the same two emission bands, corresponding to transitions from the lowest 5d excited state (2D) to the 4f ground state of Ce3+ (2F5/2, 2F7/2). Using the prepared powders, polycrystalline LuAG:Ce optically transparent ceramics were successfully fabricated at 1850 °C for 10 h under vacuum without sintering aids and annealed at 1450 °C for 20 h in air. The sintered ceramics are transparent with an in-line light transmittance in the visible wavelength range of about 50% and have a uniform microstructure with an average grain size of about 8 μm. The radioluminescence of the transparent ceramics is similar to that for calcined powders, except higher in intensity.

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Copyright
Copyright © Materials Research Society 2006

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