A description is given of the excitation spectra of a number of silicate phosphors when irradiated by ultraviolet energy. Phosphors described are (a) manganese‐activated zinc beryllium silicate, (b) lead‐ and manganese‐activated calcium silicate, (c) barium silicate activated by lead, and (d) barium silicate activated by lead and modified by the substitution of magnesium. For the manganese‐activated zinc beryllium silicates, the change of the excitation spectrum with the lattice constant is noted. For a number of the other phosphors, it is shown that the excitation spectra for the visible and ultraviolet bands are not the same. It is concluded that the mechanisms involved for the excitation of the two bands are different.
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Alexander J. Oszy (1952) studied this question.