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Photoluminescence Characteristics of Fine-sized Gd2O3:Eu Phosphor Powders Prepared by Spray Pyrolysis  

Jung, Dae Soo (Department of Chemical Engineering, Konkuk University)
Koo, Hye Young (Department of Chemical Engineering, Konkuk University)
Lee, Sang Ho (Department of Chemical Engineering, Konkuk University)
Kang, Yun Chan (Department of Chemical Engineering, Konkuk University)
Publication Information
Korean Chemical Engineering Research / v.46, no.6, 2008 , pp. 1075-1080 More about this Journal
Abstract
Fine-sized $Gd_2O_3:Eu$ phosphor powders were prepared by post-treatment of the precursor powders with hollow shape obtained by spray pyrolysis from the spray solution with citric acid and flux material. Citric acid enabled the synthesis of fine-sized phosphor powders after post-treatment by increasing the hollowness of the precursor powders. The phosphor powders prepared from the spray solution without citric acid had several microns size. Flux materials increased the mean sizes of the phosphor powders. However, flux materials improved the photoluminescence intensities of the phosphor powders under ultraviolet. $Li_2CO_3$ as the flux material was appropriate to prepare the fine-sized $Gd_2O_3:Eu$ phosphor powders with high photoluminescence intensity. The phosphor powders below 3 wt% $Li_2CO_3$ of phosphor had submicron sizes after post-treatment temperatures of $1,050^{\circ}C$ and $1,150^{\circ}C$. The photoluminescence intensity of the phosphor powders post-treated at $1,150^{\circ}C$ was 124% of that of the phosphor powders post-treated at $1,050^{\circ}C$.
Keywords
Phosphor; Spray Pyrolysis; Nano Powders; Flux Material;
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Times Cited By KSCI : 1  (Citation Analysis)
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