Voltage Dependence Curves of Cathodoluminescence of Y₂O₂S: Tb Phosphor Screen

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It has been found that a phosphor screen, composed of Y₂O₂S: Tb, in 0.6 inches CRT exhibits two distinctively different slopes in voltage dependence curve of the cathodoluminescence excitation; e. g. above and below a 3 keV potential. These difference in the voltage dependence curves of the cathodoluminescence may be attributed to an involvement of a piezoelectricity of the phosphor crystals under irradiation of the electrons.