This work is devoted to the analysis of the voltage dependence of the
luminescence of n-type nanoporous films. The correlations between the
behaviour of the photoluminescence and electroluminescence signal obta
ined from the same sample allow one to confirm that the emission quenc
hing mechanism is related to the injection of electrons into the cryst
allites. When the samples are partially oxidised, the injection condit
ions are strongly modified, leading to significant changes in the obse
rved voltage dependence of the emission.