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MM: Fachverband Metall- und Materialphysik

MM 55: Nanomaterials III - Electronic, magnetic and optical properties

MM 55.5: Vortrag

Donnerstag, 3. April 2014, 13:00–13:15, IFW B

Electroluminescent silver surfaces — •Ines Caspers, Johanna Kirschner, Tobias Haug, Sebastian Bange, and John M. Lupton — Universität Regensburg, Deutschland

Electrically contacted silver island metal films exhibit electroluminescence after deliberate introduction of a tunneling barrier into the film. The nanoscale barrier is formed by application of a direct current, while the subsequent stable light emission is excited by an alternating current. Most of the observed photons are emitted in the near-infrared region and are detected from small emissive centers located within the tunneling junction. We attribute the phenomenon to an inelastic tunneling process of electrons through the barrier formed between adjacent silver nanoparticles. The tunneling electrons are understood to couple to and excite localized surface plasmons that eventually decay radiatively. The emission polarization is correlated with the dipole formed by two nanoparticles and thus partially polarized with a reduced preference for orientation perpendicular to the tunneling current.