Degradation behaviour of ZnS phosphor powders under different experimental conditions

✍ Scribed by Swart, H. C.; Oosthuizen, L.; Holloway, P. H.; Berning, G. L. P.

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 268 KB
• Volume: 26
• Category: Article
• ISSN: 0142-2421
• DOI: 10.1002/(sici)1096-9918(19980501)26:5<337::aid-sia376>3.0.co;2-e

✦ Synopsis

The phosphor powder ZnS : Cu,Al,Au has been investigated extensively as a possible green phosphor for Ðeld emission displays (FEDs). Phosphor powders of ZnS : Cu,Al,Au have been subjected to electron bombardment (1-5 keV) at oxygen pressures ranging from 1 Â 10-7 to 2 Â 10-6 Torr and di †erent electron current densities (45-58 mA cm-2). Auger electron spectroscopy (AES) and cathodoluminescence (CL), both excited by the same electron beam, were used to monitor changes in surface composition and luminous efficiency during electron bombardment. It was shown that the degradation rate of the CL intensity is a linear function of oxygen pressure. The interactive constant (a measure of the probability of surface reactions) and the burning parameter (a measure of the probability of CL degradation per incident electron) plotted as a function of electron beam energy follow the same trend as the electron impact ionization cross-section for an atom.