Chemical compounds that emit light when struck by a beam of electrons. The amount of light emitted is proportional to the intensity of the electron beam. RGB monitors use three different phosphors to produce red, green, and blue light.
Chemical powders used to coat fluorescent tubes. They become excited when subjected to the ultraviolet light produced by the discharge in a luminous tube. A range of phosphors is available and is capable of producing a large variety of colors and whites.
Materials that emit light when irradiated by cathode rays, or when placed in an electric field. The quantity of visible light is proportional to the amount of excitation energy present.