Light emission due to dislocations in wurtzite ZnO bulk single crystals freshly introduced by plastic deformation

An arbitrary number of dislocations were freshly introduced in wurtzite ZnO bulk single crystals by plastic deformation at high temperatures (923–1123K), and the optical properties were examined by photoluminescence spectroscopy. ZnO, including a high density (more than 109cm−2) of dislocations, showed excitonic light emission with photon energies of 3.100 and 3.345eV, as well as their LO-phonon replicas, at a temperature of 11K, and the intensities increased with increasing dislocation density.