The OACs of the exciton interband transition as a function of the incident photon energy in a Zn_0.85Mg_0.15O/ZnO/Zn_0.85Mg_0.15O/ZnO/Zn_0.85Mg_0.15O (9 nm/2 nm/2 nm/7 nm/9 nm) ADQW. The red dash line is the experimental result.^[38] and the black solid line represents our theoretical result.