Energy Model for Edge Emission in Cadmium Sulfide

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Abstract
The blue and green fluorescence emitted by CdS single crystals subjected to ultraviolet radiation at low temperatures has been examined in the temperature interval from 4.2°K to 77°K. The spectral position and relative intensity of certain lines found in this fluorescence have been measured as a function of temperature between 4.2°K and 77°K. The degree of polarization of the fluorescence has been investigated at 4.2°K. From this data an energy model is proposed which accounts for the transitions leading to the blue and green fluorescence at 4.2°K, the change in these transitions as the temperature increases from 4.2°K to 77°K, and the transitions leading to the blue and green fluorescence at 77°K.