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http://dx.doi.org/10.4191/kcers.2014.51.5.413

The Effect of Pretreatment of Raw Powders on the Photoluminescence of Ca-α-SiAlON:Eu2+ Phosphor  

Park, Young-Jo (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Kim, Jin-Myung (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Lee, Jae-Wook (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Publication Information
Journal of the Korean Ceramic Society / v.51, no.5, 2014 , pp. 413-417 More about this Journal
Abstract
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.
Keywords
Nitrides; Oxynitrides; Sialon; Phosphor; Calcination;
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