Potential induced tuning of the luminescence of porous silicon: A simultaneous study of electroluminescence and photoluminescence emission

The voltage dependence of light emission from illuminated porous silicon samples immersed in solutions containing persulfate anions was studied. It is reported that the signal obtained is not simply the sum of the individual photoluminescence and electroluminescence signals. The `cross-talkʹ observed is discussed in terms of a previously proposed mechanism of photoluminescence and electroluminescence potential tuning. It is shown that a mechanism involving radiative quenching by an Auger process is consistent with the results obtained.