Numerical calculations are performed to determine the energies of the elect
ronic bound states in parabolic and diffused quantum wells. A comparison of
the electronic spectra for these concentration profiles is made and equidi
stant energy levels for a diffused quantum well are found. The virtual crys
tal approximation and the surface Green function matching (SGFM) method are
used within the framework of a semi-empirical sp(3)s* spin-dependent tight
binding model.