Phosphors by definition are materials that emit photons with a high efficiency and are of practical interest precisely for their luminescence, including cathodoluminescence. The unusual properties of these materials were discovered long before the development of such devices as cathode-ray-tube (CRT)-based instruments, in which phosphors found one of their most important applications. Currently phosphors are also used in fluorescent lamps, electroluminescent flatpanel displays, x-ray screens, scintillators, infrared-to-visible converters, electron microscope fluorescent screens, and color television screens (for a review, see Pappalardo, 1987). In the latter application, for example, ZnS:Ag is used for the blue component, ZnS:Cu, AI for the green component, and Y2O3:Eu3+ or Y2O2S:Eu3+ for the red component. In ZnS phosphors, with high CL efficiency, the mechanism of emission is that of donor-acceptor pairs. The emission peak wavelength (i.e., the color) of light produced by a particular phosphor depends on the impurities present in the material. Table 8.1 lists some of the phosphors used in cathode-ray tubes.


Loss Parameter Electron Beam Excitation Electron Beam Current Density 20nm Bandwidth Electron Beam Voltage 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • B. G. Yacobi
    • 1
  • D. B. Holt
    • 2
  1. 1.Gatan Research and DevelopmentPleasantonUSA
  2. 2.Imperial College of Science and TechnologyUniversity of LondonLondonEngland

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