High efficiency white luminescence of alumina doped ZnO

► Magnetron sputtered Al-doped ZnO thin films as white luminescent materials. ► Rapid annealing under argon results in both partial oxidation and crystallization. ► Under 550 °C, oxidation improves the green-orange photoemission. ► Above 750 °C, crystallization improves the overall photoluminescence signal. ► Both near-UV and green-orange emissions contribute to the white luminescence.