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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© 1987 American Institute of Physics.
1987
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