A brief presentation of data is given for electroluminescent measurements made on several ZnS crystals over a frequency range of 1 cps to 370 Mc/sec. Electroluminescent relaxation becomes apparent in the order of 10⁵-10⁶ cps. A simple exponential equation, I=A(V-V₀)B, was found to fit the time-average electroluminescent intensity vs voltage over four decades of intensity.
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Harman et al. (1956) studied this question.