The Function of Oxygen in Zinc Sulfide Phosphors

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Abstract
At 1200°C and form solid solutions of the composition and . The incorporation of in causes the appearance of a new absorption band and, in the presence of activators, of new fluorescence bands displaced about 150 Å towar'd longer wavelengths with respect to the original bands. These effects are explained by the assumption of separate oxygen levels 0.1 ev above the full band and of new centers consisting of associated pairs of oxygen and activator ions. The formation of such pairs is explained on the basis of the principle of compensation of volume. This principle also explains the favorable effect of oxygen on the intensity of fluorescence. It is found to be the logical complement of the principle of compensation of charge introduced earlier in connection with the incorporation of ions of a certain valency in a base lattice consisting of ions of a different valency.

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