Unambiguous identification of the PL-I_9 line in zinc oxide

摘要

Radioactive ~(111)In atoms implanted into zinc oxide (ZnO) single crystals occupy substitutional Zn lattice sites after annealing to 700℃. The respective photoluminescence (PL) spectra of the samples were monitored while the donor In decayed into stable and isolectronic Cd. The commonly labeled PL-I_9 line could be clearly assigned to excitons bound to the donor In. An arising luminescence band centered at 2.85 eV was observed with the characteristic lifetime of the isotope, and the origin could be identified as levels of the isoelectronic Cd impurities.