Emission Spectra of Some Zinc Sulfide and Zinc-Cadmium Sulfide Phosphors

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Abstract
Emission spectra of thirty zinc sulfide and zinc-cadmium sulfide phosphors with varied cadmium content and different activators are shown. The spectra were obtained with a grating spectrograph using photographic recording, and the curves are plotted in terms of relative energy. In spite of wide variation in cadmium content and use of different activators, peaks and plateaus appear repeatedly at certain positions. Analysis indicates that the broad emission bands are actually summations of contributions from a number of individual bands whose peak positions are invariant. Since these bands are found in the samples containing no added activator and since all of the activated samples show them in certain wave-length ranges, it is concluded that they are characteristic of the base material rather than the activator. Bands peaked at the following approximate positions were found: 430, 475, 520, 555, 575, 600, and 625 millimicrons. It is suggested that these different bands are related to differences in types of atomic groupings in the base material. The activator serves to influence the relative heights of the bands and may accomplish this through a differential influence on the ratio of radiative to non-radiative transitions in the different centers
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