Abstract
When single crystals of zinc sulphide are made with only a few parts per million of copper and chlorine impurities and provided with blocking-type electrodes, they show visible electroluminescence in d.c. fields. This emission can be considerably enhanced by simultaneous application of near infra-red radiation. A quantiative study is made of the enhancement effect and its dependence on field and infra-red intensity. A quantitative model is established in which it is assumed that positive holes released by the infra-red irradiation migrate to the cathode contact and there modulate the blocking potential barrier to give enhanced electron flow into the crystal with increased occurrence of impact excitation of the crystal. Further experiments in a.c. fields at 77°K show that combined electric field and infra-red irradiation produce infra-red emission in the known bands between 14 and 2 μm. A qualitative explanation is provided in this case for the dependence on applied field and infra-red irradiation intensities.
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