A stimulated emission effect has been studied in Zn1-xCdxSe/ZnSe (x=0.
3) multiquantum wells (MQWs) with the well width of 7 to 70 angstrom.
The luminescence spectrum of the quantum well (QW) exciton at 4.2 K is
shifted from the absorption spectrum by 10-12 meV to the lower-energy
side. The deviation of the peak energy of the luminescence shows that
the excitons in the MQW are inhomogeneously broadened by the monolaye
r fluctuation of the QW width. Stimulated emission is observed in the
low-energy shoulder of the exciton luminescence band, which shifts to
lower energies with increasing excitation intensity. The gain process
is explained by the exciton-exciton scattering in the MQWs.