Intense Intrashell Luminescence of Eu-Doped Single ZnO Nanowires at Room Temperature by Implantation Created Eu–Oi Complexes
Nano Letters2014Vol. 14(8), pp. 4523–4528
Citations Over TimeTop 11% of 2014 papers
Sebastian Geburt, Michael Lorke, Andréia Luísa da Rosa, Thomas Frauenheim, Robert Röder, T. Voss, Uwe Kaiser, W. Heimbrodt, Carsten Ronning
Abstract
Successful doping and excellent optical activation of Eu3+ ions in ZnO nanowires were achieved by ion implantation. We identified and assigned the origin of the intra-4f luminescence of Eu3+ ions in ZnO by first-principles calculations to Eu–Oi complexes, which are formed during the nonequilibrium ion implantation process and subsequent annealing at 700 °C in air. Our targeted defect engineering resulted in intense intrashell luminescence of single ZnO:Eu nanowires dominating the photoluminescence spectrum even at room temperature. The high intensity enabled us to study the luminescence of single ZnO nanowires in detail, their behavior as a function of excitation power, waveguiding properties, and the decay time of the transition.
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