The characteristics of two types of d.c. electroluminescent powder phosphors in the ZnS (Mn, Cu) system are described. The first shows a quantum efficiency (photons/electron) of over 100% at a luminance of 0·5 ft lamberts. The second yields over 10 3 ft lamberts with a quantum efficiency of 5% at room temperature. The power efficiencies are 0·33 and 0·05% respectively. Typical current-voltage-luminance relationships are shown.
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Vecht et al. (1968) studied this question.
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