fluorescent screen
fluorescent screen
A tool to visualize TEM images and diffraction patterns. A phosphor on a "fluorescent screen" is excited through electron collision. The emitted visible light produces "light and dark (contrast)" corresponding to the electron intensities to the screen. A fluorescent material is composed of a matrix of zinc sulfide (ZnS) and a dopant of copper (Cu), aluminium (Al) or europium (Eu). A phosphor with high luminous efficiency and with a persistence of ～100 ms is chosen for the fluorescent screen. The fluorescent screen works also as a beam shutter. When acquiring a TEM image, the screen is raised. In recent years, electron microscope images are not observed on the fluorescent screen but on a computer display.
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