Comparison between ZnO and Y₂O₃ Nanosize Particles for Degradation Protection of ZnS-Based Phosphor

ZnS-based phosphors were coaled with ZnO and Y₂O₃ nanosize particles via a colloid chemical route. Degradation by electron bombardment was improved by modification with ZnO and Y₂O₃, respectively. In a usual measurement using a metal sample holder, ZnO showed better degradation suppression than Y₂O₃. In contrast, the difference vanished when an insulating holder was used. Thus, coating of ZnO with higher electrical conduction suppresses the degradation more efficiently, as compared with Y₂O₃