A novel use of a staircase voltage waveform shows that three light emission peaks can be produced with a unipolarity voltage pulse in alkaline-earth-sulfide electroluminescent devices. Two peaks following the voltage decrease demonstrate the following: Light can be produced at fields much below those required for hot-electron effects. Activators are ionized when a field is applied. Recombination controls electroluminescence.
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Richard S. Crandall (1987) studied this question.
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