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In the new approach to study the optical response of periodic structures,successfully applied to study the optical properties of blue-emitting InGaN/GaNsuperlattices, the spontaneous charge polarization was neglected. To search theeffect of this quantum confined Stark phenomenon we study the optical response,assuming parabolic band edge modulations in the conduction and valence bands.We discuss the consequences on the eigenfunction symmetries and the ensuingoptical transition selection rules. Using the new approach in the WKBapproximation of the finite periodic systems theory, we determine the energyeigenvalues, their corresponding eigenfunctions and the subband structures inthe conduction and valence bands. We calculate the photoluminescence as afunction of the charge localization strength, and compare with the experimentalresult. We show that for subbands close to the barrier edge the opticalresponse and the surface states are sensitive to charge polarization strength.

Charge polarization effects on the optical response of blue-emitting superlattices