Oscillations in Current and in Electroluminescence in ZnS: Mn Single Crystals

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Abstract
Oscillations with time of the current and electroluminescence have been observed for single crystals of manganese-activated zinc sulfide exposed to dc voltages and ultraviolet radiation. The oscillations are correlated with saturation in the current-voltage characteristics. These observations are accounted for on the basis of assuming quenching of the conductivity at a threshold field and of applying the principle of minimum entropy production to the steady-state solutions. From the threshold fields obtained on fitting the theory to the data and from the concurrence of electroluminescence, consideration is given to the origin of field quenching.