Photoluminescence of polycrystalline ZnO under different annealing conditions

Abstract

We investigated polycrystalline zinc oxide (ZnO) with different annealing conditions in air by x-ray photoelectron spectroscopy and photoluminescence. We found that the concentration of antisite oxide $({\mathrm{O}}_{\mathrm{Zn}})$ increases when ZnO ceramics were in an O-rich condition. As the concentration of antisite oxide $({\mathrm{O}}_{\mathrm{Zn}})$ increased, the photoluminescence intensity of the green band emission increased. The crossover temperature of the free and bound excitons was roughly estimated as 100 K.