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    National Tsing Hua University Institutional Repository > 工學院  > 材料科學工程學系 > 期刊論文 >  Y2O2S : Eu red phosphor powders coated with silica

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/52223

    Title: Y2O2S : Eu red phosphor powders coated with silica
    Authors: Jean JH;Yang SM
    教師: 簡朝和
    Date: 2000
    Publisher: Wiley-Blackwell
    Relation: JOURNAL OF THE AMERICAN CERAMIC SOCIETY,Volume: 83,Issue: 8,Pages: 1928-1934,Published: AUG 2000
    Keywords: PARTICLES
    Abstract: Y2O2S:Eu red phosphor powders were coated with silica (SiO2), using sol-gel and heterocoagulation techniques, Phosphor powders were dispersed in ethanol with tetraethyl orthosilicate and water. Hydrochloric acid was used to catalyze the sol-gel reaction, and an amorphous film 10-20 nm thick was observed via transmission electron microscopy (TEM). Colloidal SiO2 powders 10-70 nm in size were used, and the SiO2 powder coating was made by controlling pH values in the range of 4.5-8, in which a negatively charged surface of SiO2 powder and a positively charged surface of red phosphor powder were formed. Then, SiO2 powders were adsorbed electrically onto the phosphor powder surface, as evidenced by TEM, dissolution, and zeta potential measurements. Chemical bonding in the coating was studied using electron spectroscopy for chemical analysis and Fourier transform infrared spectroscopy.
    URI: http://as.wiley.com/WileyCDA/Brand/id-35.html
    Appears in Collections:[材料科學工程學系] 期刊論文

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