Effect of Crystal Disorder on the Electroluminescence of Zinc Sulfide Phosphors

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Abstract
A blue electroluminescent phosphor was prepared by prefiring precipitated at a high temperature, activating with Cu, and retiring at about 700°C. The material was characterized by strong pale blue electroluminescence throughout the body of the crystal. The Cu entered most effectively at that temperature of retiring where the transformation from hexagonal to cubic structure occurred most readily. This transformation was associated with a process of one‐dimensional disorder in the crystals, and it is suggested that for maximum electroluminescence brightness, fullest use must be made of the disorder process simultaneously with the entry of the activator.

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