In this work we present a simple two-level model, which can be employed to describe the migration of weakly localized excitons in quantum wells (QW). The migration of excitons is an intra-well process which can be readily observed in QWs which present thickness fluctuations of a few monolayers that extend over large area terraces (also called islands) with dimensions much larger than the Bohr radius of the exciton. This effect is experimentally observed as relative changes of the intensity of the spontaneous emission, as a function of temperature, of the transitions of QWs with different thickness. This model has been successfully applied to the analysis of the temperature dependence of the photoluminescence spectra of Zn 1±x Cd x Se QWs.

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