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http://dx.doi.org/10.4191/KCERS.2007.44.5.155

Crystal Structure and Photoluminescence of Domestic Natural Alkaline Feldspar  

Choi, Jin-Ho (Department of Materials Science and Engineering, Hoseo University)
Cheon, Chae-Il (Department of Materials Science and Engineering, Hoseo University)
Kim, Jeong-Seog (Department of Digital Display, Hoseo University)
Publication Information
Journal of the Korean Ceramic Society / v.44, no.5, 2007 , pp. 155-159 More about this Journal
Abstract
Blue light-emitting phosphors having the excitation spectrum range of the medium-long ultraviolet ($280nm{\sim}400nm$) have been prepared by solid state reaction method. As a starting material the natural alkaline feldspar powder produced from the domestic mine field in Buyeo, Chungnam-do. The photoluminescence characteristics and crystal structures have been analyzed for the phosphor samples. The powder mixture of the natural alkaline feldspar and the rare-earth oxide was calcined at $800{\sim}1000^{\circ}C\;for\;3{\sim}4h$ in air. The calcined samples we fully ground at room temperature and then heat-treated in the mild reducing gas atmosphere of $5%H_2-95%N_2$ mixture at $1100{\sim}1150^{\circ}C\;for\;3{\sim}4h$. The natural alkaline feldspar material consists of the monoclinic orthoclase ($KAlSi_3O_8$) and the triclinic albite ($NaAlSi_3O_8$) phases. At the $0.5wt%Eu_2O_3$ addition the PL spectrum showed the maximum intensity and with further increase of $Eu_2O_3$ the PL intensity decreased. The albite phase disappeared in the $Eu_2O_3$ doped phosphors. The effect of the co-doped activator on the PL characteristics have been also discussed.
Keywords
Alkaline feldspar; Domestic; Buyeo; $Eu_2O_3$; Phosphor; PL characteristics;
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Times Cited By KSCI : 2  (Citation Analysis)
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