A study of the materials preparation of zinc sulfide powders activated by manganese and copper has yielded direct‐current electroluminescent cells with considerably improved performance. Investigation of the forming process has led to new cell configurations which are described. Some low‐voltage characteristics are illustrated, 0.5 ft‐L being obtained at 20V. The main problem of deterioration is discussed.
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Vecht et al. (1970) studied this question.
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