Observation of localized above‐barrier excitons in (CdTe)1(ZnTe)2/ZnTe short‐period‐superlattice multiple quantum wells by photoluminescence spectroscopy

The calculation of energy levels and wave functions of (CdTe)1(ZnTe)2/ZnTe short‐period‐ superlattice multiple quantum wells is performed. It indicates that there may be above‐barrier excitons localized in the ZnTe barrier layer. The photoluminescence arising from recombination of the above‐barrier excitons has been observed.