Dependence of photoluminescence of ZnO/Zn0.85Mg0.15O multi-quantum wells on barrier width

Anisotropic photoluminescence of nonpolar ZnO epilayers and ZnO/Zn1-xMgxO multiple quantum wells grown on LiGaO2 substrate

“…4(c) in the temperature range of 10-300 K. The peak position at 90°polarization decreases from 3.625 eV (10-100 K) to 3.536 eV (300 K), whereas the peak energy at 0°polarization increases from 3.590 eV (10 K) to 3.596 eV (50 K) and then decreases to 3.556 eV (300 K). The slight blue-red shift is usually attributed to the radiative emission of localized excitons [32,33]. The energy difference ∆E (E 90 -E 0 ) between 90°and 0°polarization varies from +30 meV at low temperature to -20 meV at room temperature.…”