Shift of the infrared absorption and emission spectra of transition metal ions in solid solutions of semiconductor compounds

A universal theoretical model is proposed that explains the observed shift of IR absorption and emission bands in the spectra of transition metal ions in solid solutions of semiconductor compounds. The model has been used for estimating the long-wavelength shift of luminescence bands in the spectra of semiconductor solid solutions with increasing concentration in application to crystals of the ternary systems Zn$_{1-x}$Mg$_{x}$Se : Cr$^{2+}$ and Cd$_{1-x}$Mn$_{x}$Te : Fe$^{2+}$. Description of the phenomenon is generalized to the case of multicomponent solid solutions.