In the present paper an attempt has been made to study the emission
characteristics of the two peaks, blue and green of a (ZnS:Cu) double
band electroluminophor, particularly the frequency effect. As regards
voltage, both the peaks are found to behave in the usual way but the frequency
relations give rise to somewhat new results With a rise in
applied field frequency, the green band suffers a peak shift towards lower
wavelength side, whereas the blue one is always shouldered and is little
affected as far as peak position is concerned. The light output is observed
to fall down at higher frequencies instead of showing a constant intensity
of emission
