Publication

A comparison between ZnCdS and YAG fluorescent screens from TEM

Philippe Buffat
1988
Conference Papers

Abstract

The resolution of TEM fluorescent screens is one of the limiting factors for the acquisition of CCTV images with a high definition (1024 x 1024 pixels or more). Our comparison between YAG single crystal and ZnCdS powder phosphors screens shows that this latter offers a better resolution at 100 and 300 kV accelerating voltage. Nevertheless, still higher resoultion are necessary.

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Philippe Buffat
1988
Conference Papers

Abstract

Official source

Related concepts (24)

Transmission electron microscopy

Transmission electron microscopy (TEM) is a microscopy technique in which a beam of electrons is transmitted through a specimen to form an image. The specimen is most often an ultrathin section less than 100 nm thick or a suspension on a grid. An image is formed from the interaction of the electrons with the sample as the beam is transmitted through the specimen. The image is then magnified and focused onto an imaging device, such as a fluorescent screen, a layer of photographic film, or a sensor such as a scintillator attached to a charge-coupled device.

Electron microscope

An electron microscope is a microscope that uses a beam of electrons as a source of illumination. They use electron optics that are analogous to the glass lenses of an optical light microscope. As the wavelength of an electron can be up to 100,000 times shorter than that of visible light, electron microscopes have a higher resolution of about 0.1 nm, which compares to about 200 nm for light microscopes.

Phosphor

A phosphor is a substance that exhibits the phenomenon of luminescence; it emits light when exposed to some type of radiant energy. The term is used both for fluorescent or phosphorescent substances which glow on exposure to ultraviolet or visible light, and cathodoluminescent substances which glow when struck by an electron beam (cathode rays) in a cathode-ray tube. When a phosphor is exposed to radiation, the orbital electrons in its molecules are excited to a higher energy level; when they return to their former level they emit the energy as light of a certain color.

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A comparison between ZnCdS and YAG fluorescent screens from TEM

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