Microscopic observations of electroluminescent emission from ZnS crystals activated with Cu, Cu: Pb, or Ag have shown that the typical emitting entity is a narrow line. These lines lie in [11̄·0] directions of the wurtzite structure in planar regions associated with stacking faults or closely spaced alternations in crystal structure. A model of electroluminescence involving linear physical defects is proposed for the origin of the lines and their observed dependence on voltage, frequency, and phase of the applied electric field.
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Gillson et al. (1962) studied this question.
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