Elektrolumineszenz an Zinksulfid-Einkristallen

Abstract

Brightness waves observed at the anode of ZnS crystals on excitation with a.c. voltage, with and without superimposed d.c. voltage, show “green” maxima (5200 Å) at phases related to the phases of zero voltage or current. They disappear if the electrodes are isolated from the crystal. The observations can be interpreted by assuming hole injection as the cause of the electroluminescence and taking into account a decrease of recombination probability with increasing velocity of the charge carriers. At high voltages, a “blue” maximum (4770 Å) appears in phase with voltage maximum, and this over the whole crystal.