Abstract
In order to prevent the surface oxidation of ZnS-type phosphors in field emission displays (FEDs), surface coating is an effective way. In this study, the uniform and continuous silica nanocoatings on ZnS-type phosphors are successfully obtained by the chemical precipitation method using sodium silicate as the precursor. The zeta potential and transmission electron microscopy (TEM) results show that ZnS phosphors are completely covered with uniform and continuous coatings. At pH 5.0 ± 0.5, the ZnS phosphors and silica powders carry opposite charges, thus attract each other easily. The resulted coatings are expected to inhibit the degradation of ZnS phosphors at higher current densities.
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