Abstract
Blue light-emitting phosphors having the excitation spectrum range of the medium-long ultraviolet (280 ㎚~400 ㎚) 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 800~1000℃ for 3~4 h in air. The calcined samples were fully ground at room temperature and then heat-treated in the mild reducing gas atmosphere of 5%H₂-95%N₂ mixture at 1100~1150℃ for 3~4 h. The natural alkaline feldspar material consists of the monoclinic orthoclase (KAlSi₃O?) and the triclinic albite (NaAlSi₃O?) phases. At the 0.5 wt%Eu₂O₃ addition the PL spectrum showed the maximum intensity and with further increase of Eu₂O₃ the PL intensity decreased. The albite phase disappeared in the Eu₂O₃ doped phosphors. The effect of the co-doped activator on the PL characteristics have been also discussed.
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