OACs with the variation of incident photon wavelength λ as a function of xl for Zn_{1 − xl}Mg_xlO/ZnO/Zn_{1 − xc}Mg_xcO/ZnO/Zn_{1 − xr}Mg_xrO ADQWs with L_b1 = 4 nm, L_w1 = 5 nm, L_b2 = 7 nm, L_w2 = 3 nm, xc = 0.4, and xr = 0.4, for the transition from (a) E₁ to E₂, (b) E₂ to E₃, and (c) E₁ to E₃.