Field-Induced Color Shift in Electroluminescent Zinc Sulfide

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Abstract
In a previous paper it was shown that the application of an electric field to certain electroluminescent phosphors in an equilibrium condition produced little light, but that luminescent centers were activated in some way, and radiated upon removal of the field. It is here shown that while the liminescent centers are held in the activated state, changes are taking place which are observed as a color shift in the light radiated as a function of time held in the activated state. For certain green and blue phosphors, prompt removal of the field after activation produces green and blue bands which are also observed in operation at 60 cps. If the field is maintained for some seconds, and then removed, these bands are suppressed and a "yellow band" appears in their place at a rate determined by a temperature dependent time constant of the order of a second at room temperature. Possible explanations of this result are discussed.

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