Cathodoluminescent characteristics and light technical parameters of thin film screens based on oxides and oxysulfides of rare earth elements.

摘要

Results on creation of thin film-single crystal high resolution screens with energy control of luminescence color are presented. In order to create phosphor films ion-plasma technology for deposition of yttrium and lanthanum oxides and oxysulfides activated by rare earth elements has been developed. The screen consists of phosphor film on phos¬phor substrate with different colors of luminescence (e.g. Y2O3 - Eu film with red color on Y3AbOi2 - Tb,Ce substrate with green color of luminescence). Electron irradiation causes luminescence with color that depends on energy of the electron beam. The physical reason for color change is that electron beam energy defines electron penetration depth. If the energy is weak, only the film is excited. More powerful beam penetrates into the substrate and thus changes the color of luminescence.