Abstract
Correlation is found between the efficiency of infrared emission due to band to band transitions in lead sulphide layers and the photoconduction efficiency. Correlation is also found between the emission and the decay time for the photocurrent. Commercial cells with evaporated layers were studied. Good cells have decay times of the order of 300 μsec while bad cells have times of the order of 30–50 μsec. From comparison with estimated intrinsic life times in lead sulphide and from other considerations it is concluded that the efficiency of emission in such layers can approach 50 per cent. Considerable improvement in emission efficiency is obtained by cooling the layers, the photoconductivity efficiency approaching that for radiation noise limitation.
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