Photoluminescence excitation spectroscopy (PLE) of nitrogen doped ZnSe
epilayers is reported here for the first time. The dependence of the
PLE spectra on the net acceptor concentration in ZnSe:N and the temper
ature has been investigated. A new radiative transition at 2.732 eV is
revealed in highly doped ZnSe:N, and is attributed to a transition be
tween the valence band and a new donor level with an ionisation energy
of 88 meV. The effect of strain on the exciton spectra in undoped and
N-doped layers is discussed.