Electroluminescence of ZnS Single Crystals with Cathode Barriers

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Abstract
Certain ZnS crystals show electroluminescence predominantly near the cathode. The major emission from Cu-activated crystals occurs as a burst of light when the exciting voltage is suddenly removed, as electrons flowing back toward the cathode to neutralize the barrier charge recombine with ionized luminescent centers. This burst may be quenched by a voltage in the initial direction or enhanced by a voltage in the opposite direction. There is also a small steady component of emission due either to capture of electrons that entered the crystal from the cathode or to excitation of centers to discrete levels. In Mn-activated crystals, only the latter has been observed.

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