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http://dx.doi.org/10.4191/KCERS.2008.45.2.126

Variation of Photoluminescence in Zirconia Gel by Pyrolysis  

Han, Kyu-Suk (Division of Materials Science and Engineering, Inha University)
Ko, Tae-Gyung (Division of Materials Science and Engineering, Inha University)
Publication Information
Journal of the Korean Ceramic Society / v.45, no.2, 2008 , pp. 126-131 More about this Journal
Abstract
In this study, we prepared zirconia gel by the sol-gel method and investigated its photoluminescence properties by varying pyrolysis temperature. The addition of acetic acid into a Zr-alkoxide solution resulted in forming the bidentate ligands with Zr ions and producing a stable gel. At the pyrolysis temperature of $350^{\circ}C$, the zirconia nanocrystals with tetragonal structure gradually appeared in the gel. The PL intensity of the zirconia gel increased with increasing the pyrolysis temperature up to $350^{\circ}C$, but decreased above the temperature. Concurrently, its PL peak wavelength continuously shifted from ${\sim}440\;nm$ to ${\sim}550\;nm$ with the temperature. The PL characteristics of the zirconia gels were closely associated with decomposition of residual organic groups, the formation of the zirconia nanocrystals, and the tetragonal to monoclinic phase transformation.
Keywords
$ZrO_2$; Photoluminescence; Sol-gel; Nanopowder;
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