Abstract
The effect of calcination treatment of raw powders prior to high temperature synthesis of Ca-α-SiAlON:Eu 2+ phosphor was investigated. Based on data acquired from thermogravimetric analysis, calcination temperatures were set at 600, 750, and 900℃. Compared to the photoluminescence (PL) intensity of direct synthesis without calcination, a similar intensity was found for the 600℃ treatment, a 19% increased PL intensity was found for the 750℃ treatment, and a 23% decreased PL intensity was found for the 900℃ treatment. Observation of the particle morphology of the synthesized phosphors revealed that the material transport promoted through the agglomerates formed by the 750℃ treatment led to enhanced PL intensity. On the other hand, the oxidation of the starting AlN particles during the 900℃ treatment resulted in decreased photoluminescence.
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