| The Effect of Pretreatment of Raw Powders on the Photoluminescence of Ca-α-SiAlON:Eu2+ Phosphor |
| Young-Jo Park, Jin-Myung Kim, Jae-Wook Lee |
| Engineering Ceramics Research Group, Korea Institute of Materials Science |
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| ABSTRACT |
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The effect of calcination treatment of raw powders prior to high temperature synthesis of Ca-${alpha}$-SiAlON:$Eu^{2+}$ phosphor was investigated. Based on data acquired from thermogravimetric analysis, calcination temperatures were set at 600, 750, and $900^{circ}C$. Compared to the photoluminescence (PL) intensity of direct synthesis without calcination, a similar intensity was found for the $600^{circ}C$ treatment, a 19% increased PL intensity was found for the $750^{circ}C$ treatment, and a 23% decreased PL intensity was found for the $900^{circ}C$ treatment. Observation of the particle morphology of the synthesized phosphors revealed that the material transport promoted through the agglomerates formed by the $750^{circ}C$ treatment led to enhanced PL intensity. On the other hand, the oxidation of the starting AlN particles during the $900^{circ}C$ treatment resulted in decreased photoluminescence. |
| Key words:
Nitrides, Oxynitrides, Sialon, Phosphor, Calcination |
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