Abstract
We have calculated the luminescence spectra of localized excitons in disordered solid solutions. The theory takes into account two different aspects of electron-phonon interactions: phonon-assisted tunneling between tail states and phonon-assisted recombination. It has been shown that a shift of the luminescence band relative to the exciton absorption line is due to both processes. The high energy side of the luminescence band is governed by the phonon-assisted tunneling with the rate strongly dependent on the spatial size of the localized exciton wavefunction in the mobility edge vicinity. The phonon-assisted recombination was taken into account for fitting the luminescence spectra. Calculations were compared with experimental findings on CdS(1 − c)Sec. For satisfactory fitting of CdS(1 − c)Sec luminescence spectra in a wide composition range two models of localized excitons should be used: (I) exciton trapped as a whole and (II) trapped hole with Coulomb bound electron.
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