Brightness Waves and Transitory Phenomena in the Quenching of Luminescence by Alternating Electric Fields

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Abstract
Zinc or cadmium sulfide phosphors, especially phosphors having short persistence, are less sensitive to ultra-violet light or to x-rays when they are submitted to the action of an alternating electric field. With a half-wave x-ray generator and an alternating field of frequency equal to the frequency of the potential applied to the x-ray generator (50 cps), and in phase with it, the brightness waves (a curve giving the variation in the instantaneous brightness as a function of time in the interval of a period) are greatly modified. A sharp secondary maximum appears when the field passes through zero in each cycle; the amplitude of this maximum varies quickly during the cycles which immediately follow the application of the field. If the light is filtered, the shape of the brightness wave varies according to the spectral region which is observed.

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