Preparation of Rare-Earth Doped Zirconia Nanoparticles via Supercritical Hydrothermal Method for Luminescence Properties

Yukiya Hakuta; Kiwamu Sue; Yoshihiro Takebayashi; Satoshi Yoda; Takeshi Furuya; Hiroshi Takashima

doi:10.4028/www.scientific.net/KEM.512-515.59

Paper Titles

Synthesis and Surface Characterization of a Silica White Prepared from High Si:Al Fine Powder
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Extraordinary Adsorption Properties of Nano Porous Hydrophobic Silica Aerogels
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Preparation of Mullite Nanocomposites Powders by the Hydrothermal Crystallization Method from Coal Gangue
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Effects of Solvents on Synthesis and Dispersion of Zircon Powder via Non-Hydrolytic Sol-Gel Route
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Preparation of Rare-Earth Doped Zirconia Nanoparticles via Supercritical Hydrothermal Method for Luminescence Properties
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Fabrication of Graphene/Zirconia Nanocomposite by Mixing Graphite Oxide and Zirconia Nanopowders and Pressureless Sintering
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Study on Properties of Slurry for Making Zirconia Fiber
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Synthesis of Amorphous Al₂O₃-ZrO₂ Powders Prepared by Citric Acid Gel Process
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Low Temperature Molten Salt Synthesis of Nano Crystalline MgAl₂O₄
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Preparation of Rare-Earth Doped Zirconia Nanoparticles via Supercritical Hydrothermal Method for Luminescence Properties

Abstract:

We report preparation of Tb3+ or Eu3+ doped zirconia nanoparticles by sub- and supercritical hydrothermal reaction and luminescence properties. Experiments were performed by a flow-type hydrothermal reaction system. We investigated the effect of the reaction temperature on crystal structure, particle size and photo-, electro-luminescence properties. Reaction temperature was varied in the ranges of 150 to 400 C and reaction pressure was fixed to 30MPa. Characteristics of the products were performed by XRD, TEM, SEM-EDS and PL, EL measurements. The product transformed from amorphous zirconium hydroxide to tetragonal ZrO2 with an increase in the reaction temperature, regardless of the doped ion species. The ZrO2:Eu particles obtained at 400C were spherical with around 5 nm in diameter. ZrO2:Eu nanoparticles obtained under supercritical water condision showed typical photoluminescence spectra of f-f transition of Eu3+; however ZrO2:Tb nanoparticle obtained under the same condition showed no photoluminescence. Furthermore, the ZrO2:Eu nanoparticles obtained at 400 C showed high electroluminescence properties at electric field of 350V and 1kHz.