Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
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Novel method to control initial crystallization of Eu3+ doped ZrO2 nanophosphors derived from a Sol–Gel route based on HNO3 and their site-selective photoluminescence
Ryo IKESHITATomokatsu HAYAKAWAMasato ISOGAIYuji IWAMOTOJean René DUCLÈREFabien RÉMONDIÈREPhilippe THOMASAndré LECOMTE
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キーワード: ZrO2, Eu3+, Nanophosphor, Sol–gel
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2018 年 126 巻 7 号 p. 551-556

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In this study, Eu3+-doped ZrO2 nanophosphors were obtained by a sol–gel method with HNO3 as a catalyst, which led to white powders of small ZrO2 nanocrystals after low temperature calcination. However, exothermic reactions of NO3 were observed during the heat-treatment leading to ZrO2 crystallization. To avoid such reactions and to understand the initial crystallization of ZrO2 doped with Eu3+ ions, we developed an original route in which the xerogel powders were pre-washed in ethanol before immersing them in Eu3+ solution to remove NO3. The effects of heat-treatment on the Eu3+ photoluminescence (PL), crystallization of ZrO2 xerogels, and Eu3+ localization were studied with PL spectroscopy, thermogravimetric analysis and powder X-ray diffraction. It was found that the amorphous ZrO2 xerogels crystallized in a tetragonal structure, with a small amount of monoclinic ZrO2 also being precipitated after longer calcination periods. Finally, the Eu3+ ions on the surface of the ZrO2 xerogels were found to diffuse into higher symmetric Zr substitutional sites in the tetragonal ZrO2 matrix after heat-treatment.

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© 2018 The Ceramic Society of Japan
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