Journal
OPTICAL MATERIALS
Volume 31, Issue 2, Pages 126-130Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2008.02.001
Keywords
Gd2O3:Eu3+; polyvinylpyrrolidone; Preferred orientation; Sol-gel technique
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Funding
- National Natural Science Foundation of China [50672068]
- Shanghai Natural Science Foundation [05ZRI4123]
- Science and Technology Commission of Shanghai Municipality [05JC14062]
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Dense and transparent Gd2O3:Eu3+ thick films were prepared from the inorganic salt and 2-methoxyethanol solution containing polyvinylpyrrolidone (PVP) via sol-gel technique. It was found that the films exhibited a preferred a-axis orientation, the preferential orientation parameter was 83.8%, and they possessed of a high intensity ratio of D-5(0) -> F-7(2)/D-5(0) -> F-7(1). The correlation between structure and luminescent properties of the film was tentatively discussed. These results indicated that PVP played all important role in the formation of Gd2O3:Eu3+ thick films, suppressing the stress, changing the growth direction of the films from < 1 1 1 > to < 100 > orientation and improving the covalency of Eu-O bonds and the energy transfer from S-6 sites to C-2 sites. The Gd2O3:Eu3+ thick film prepared with PVP showed a superior luminescent property, which implies that it will have promising applications in high-spatial-resolution X-ray imaging and flat panel display devices. (C) 2008 Elsevier B.V. All rights reserved.
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