Room temperature electroluminescence from the n-ZnMgO/ZnO/p-ZnMgO heterojunction device grown by ultrasonic spray pyrolysis

(A) Room temperature EL spectra from the n-Zn0.8Mg0.2O/ZnO/p-Zn0.8Mg0.2O heterojunction device under different forward injection current of (a) 50, (b) 75, (c) 100 and (d) 125 mA. (B) Photograph of room temperature EL from the n-Zn0.8Mg0.2O/ZnO/it p-Zn0.8Mg0.2O heterojunction device under forward injection current of 100 mA in dark.