Abstract
Luminescence has been observed in a variety of materials under the action of a‐c and d‐c fields. The materials include rare earth tungstates, , and which have been self‐activated or activated with Cr, Mn, or a rare earth element. Experiments in reduced pressures of a variety of atmospheres indicate that the luminescence observed is not the same as the electroluminescence of or of phosphors. This is further confirmed by differences in the frequency dependence of emission and by the analysis of the spectral components of the emission. Speculations as to the mechanism of the possible emission processes are discussed.
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