Electron microscope has a vacuum vessel, an electron emitter for producing an electron beam, a device for focusing and deviating the electron beam and a luminescent screen with a coating containing a zinc sulfide phosphor

摘要

Electron microscope has a vacuum vessel; an electron emitter for producing an electron beam; a device for focusing and deviating the electron beam and a luminescent screen with a coating containing a zinc sulfide phosphor selected from ZnS: Cu, Al and ZnS: Cu, Al. Preferred Features: The phosphor has an average grain size d of 1.0-4.0 mu m. The phosphor coating is made of particles of oxides or hydroxides of Mg, Ca, Sr, Ba, Zn, Sc, Y, La or Al.