ZnS:Cu, Cl and (Zn, Cd)S:Cu, Cl Electroluminescent Phosphors

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Abstract
Procedures for the preparation of and EL phosphors are based on firing in an atmosphere containing elementary S. Cl‐in‐corporation is controlled by firing in capped silica tubes or in open boats in a current of . Dependence of brightness on activator concentration is established on the basis of presumably constant excess Cu as . The use of Pb was found to be disadvantageous. Introduction of Cd causes formation of the hexagonal phase and a compound and simultaneous decrease of electroluminescence brightness as well as dependence of electroluminescence emission color on Cd concentration. A two‐step firing procedure is given by means of which this effect may be partially avoided.

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