Abstract
Pulsed laser deposited ZnS bare and SnO 2 coated ultra thin films were subjected to prolonged electron beam bombardment with 2 keV energy and a steady 44 mA/cm 2 current density, in 1 × 10 −6 Torr O 2 pressure backfilled from a base pressure of 3 × 10 −9 Torr at room temperature. Auger electron spectroscopy (AES) was used to monitor changes of the surface chemical composition of both the bare and coated phosphor films during electron bombardment. Degradation was manifested by the decrease of sulphur and accumulation of oxygen on the surface of the bare phosphor. However, with the SnO 2 coating this phenomenon was delayed until the protective SnO 2 was depleted on the surface through dissociation and reduction.
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