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The luminescence of manganese activated zinc sulfide has been investigated. It was found that the luminescence, excited by cathode rays, is profoundly influenced by alternating electric fields. At room temperature the emission due to the manganese is enhanced, and that due to selfactivation is quenched by the field. At lower temperatures, however, the direction of the energy transport controlled by the electric field changes the sign: the emission of mangenese is quenched by the field, whereas the luminescence due to selfactivation is enhanced. This behaviour may be explained with reference to our model according to which the electrons gain energy in the electric field and the number of occupied states changes.  相似文献   

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