Blue emission and energy transfer characteristics of Eu-doped sol–gel glasses without post-processing

We have fabricated SiO 2–Al 2O 3 sol–gel glasses which show a distinct blue emission from Eu 2+ ions without any deoxidizing heat-treatment nor post-doping by soaking in Eu-solution. Homogeneity and versatility of the sol–gel process itself, considering combinations with various organic molecules, a...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2001-11, Vol.293, p.595-599
Main Authors: Kamata, N, Satoh, C, Tosaka, K, Yamada, K
Format: Article
Language:English
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Summary:We have fabricated SiO 2–Al 2O 3 sol–gel glasses which show a distinct blue emission from Eu 2+ ions without any deoxidizing heat-treatment nor post-doping by soaking in Eu-solution. Homogeneity and versatility of the sol–gel process itself, considering combinations with various organic molecules, are thus maintained. The fabrication process required only the hydrolysis of starting materials Si(OC 2H 5) 4, Al(OC 4H 9) 3, and Eu(NO 3) 3. Detailed study of photoluminescence (PL) revealed that the incorporation of Al in correct proportion to the concentration of Eu changes Eu 3+ into Eu 2+ effectively through the sol–gel process. In the blue-emission band of Eu 2+, centered at 410 nm, a distinct dip due to the dominant absorption line of Eu 3+ was observed at 395 nm, which indicates clearly the energy transfer from Eu 2+ to Eu 3+.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(01)00756-6