The emission bands of GaSe doped with Mn in the range of 0.1 to 1 at.% have
been studied by photoluminescence (PL) measurements. From the temperature
dependence of the PL intensity, the peak energy as a function of Mn concent
ration, and excitation spectrum, we found that the emission band at 1.82 eV
is caused by the transition from the conduction band to the acceptor level
at 0.30 eV above the valence band.