General equations are derived for predicting the change in fluorescent intensity of zinc-sulphide phosphors containing more than one kind of impurity activating center, according to the theory of hole migration. The effect on the blue fluorescence efficiency of exciting intensity, temperature, and one other kind of center is discussed. If this other center is a killer which produces no visible radiation, it is shown that the observed fluorescence of ZnS-Ag-Co quantitatively agrees with the theory if the probability that a particular excited Co center will recombine with an electron in the conduction band in unit time is much larger than the corresponding probability for a silver center.
The influence of independent electron traps on the hole migration is also discussed.
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