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THE ELEMENTS OF MATTER AND LUMI
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absorbed absorption activator atoms alpha particles atoms average bonding energy cathodoluminescence cence centers charged material particles Chem chemical compare Fig conduction band CR beam current densities decreases effect emission band emission spectra energy levels example excitation density excitation energy excited electrons exciton exhibit Fluorescence heat hex.-ZnS hex.-ZnS:Ag host crystal host-crystal ibid impurity atoms increasing infrared intensity ions kinescope lamps long-wave luminance luminescence efficiency luminescence emission luminescence photons maximum mg cm-2 Mn activator molecules obtained operation Optical Soc optimum output peak phors phos phosphor crystals phosphor screens phosphorescence phosphorescence emission photoconduction photoluminescence photons photostimulation phototube Phys positive hole primary particles primary photons produced proportion radiation radiative transition rbhdl relative room temperature shown in Fig silicate solid spectral-distribution curves spectrum structure Sulphide t~at decay tenebrescence thermal thermal radiation thermostimulated tion voltage wavelengths weight per cent whereas x-ray Zinc