Abstract
Measurements of the light output as a function of the beam current under stationary cathode-ray excitation are performed for zinc silicate activated with various concentrations of Mn or Ti and for zinc sulphide activated with ZnCI and with AgCI. The intensity of fluorescence saturates at high current densities. Under continuous electron bombardment the saturation depends on the activator content, on the presence of quenchers and on the decay time of the fluorescence. The concentration of centres in ZnSZnCI is estimated. In the case of a spot of high current density scanning a definite area, the saturation does not depend on the decay time of fluorescence if the time in which the electron beam passes a certain point of this area, is small with respect to the decay time.
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