Luminescence of CdMnTe/CdMgTe structures with periodically arranged narrow-gap inclusions

The study is concerned with the excitonic and intracenter emission spectra of planar structures with periodically arranged Cd0.9Mn0.1Te layers (with a nominal thickness corresponding to one monolayer) separated by Cd0.5Mg0.5Te barriers with different thicknesses. The complex structure of the spectra and their variations in the temperature range from 5 to 80 K are indicative of the inhomogeneity of the Cd0.9Mn0.1Te layers, the important role of vertical diffusion, and the correlation between irregularities in the direction of growth at a small spacing between the narrow-gap Cd0.9Mn0.1Te layers. A substantial factor controlling the spectrum and quantum efficiency of excitonic emission is the relation between the exciton radius and the period of the structure.