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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)
  • Received : 2014.08.07
  • Accepted : 2014.09.05
  • Published : 2014.09.30

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.

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