화학공학소재연구정보센터
Macromolecular Research, Vol.17, No.11, 907-911, November, 2009
Changes in the Moisture Stability of CaS:Eu^(2+) Phosphors with Surface Coating Methods
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To improve the moisture stability of the CaS:Eu^(2+) red phosphor, surface coatings with silica nanoparticles were performed using five different methods, i.e., P1, P2, P3, P4, and P5. The phosphors were coated with silica nanoparticles using a dip coating method (P1) and sol-gel method (P2). The phosphors were coated using a solution containing silica nanoparticles and poly(1-vinyl-2-pyrrolidone), PVP, (P3). The phosphors were also coated with silica nanoparticles by reacting with the 1-vinyl-2-pyrrolidone (VP) monomer (P4) or by reacting with mixtures containing VP and tetraethylorthosilicate (P5). A decrease in the photoluminescence (PL) intensity was observed regardless of the coating methods. However, the moisture stability of the phosphors was enhanced by the coating when aged in a temperature-controlled humidity chamber. Among these methods, the P4 (or P5) method exhibited the greatest increase in moisture stability of the phosphors. The coated phosphors showed a relatively constant intensity with aging time, whereas the uncoated phosphor showed a decrease.
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