The Green Luminescence of ZnO

Abstract

Abstract The green luminescence of different preheated ZnO powders is measured. From the variation of the intensity and the shift of the maximum to longer wavelengths with temperature, a new model for the activator centre is proposed. It is accepted that the activator level is due to an absorbed O − ion and lies 0.8 eV below the conduction band. The trapped electron may recombine with a positive hole in the valence band or in a b centre.