Dresden 2011 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 85: Poster Session II

HL 85.12: Poster

Donnerstag, 17. März 2011, 18:00–21:00, P4

Investigation of the effect of plasmonic metal nanostructures on nanocrystalline TiO₂:Eu³⁺ nanoparticles — cahit benel¹, •barat kurbanjan¹, ulrich herr¹, manuel goncalves², othmar marti², johannes boneberg³, and paul leiderer³ — ¹Inst. of Micro and Nanomaterials, University of Ulm, Germany — ²Inst. of Experimental Physics, University of Ulm, Germany — ³Dept. of Physics, University of Konstanz, Germany

Rare-earth-doped materials are used in a variety of photonic applications such as phosphors, X-ray imaging, scintillators, display panels and photonic band gap materials. In this work, Eu³⁺ doped TiO₂ nanoparticles have been produced via chemical vapor synthesis (CVS). Samples with different Eu³⁺ ion concentration ranging from 0.05 at% to 1.51 at% were prepared. XRD results show that the samples primarily consist of the anatase phase. However, with increasing dopant level, an increasing amount of the rutile phase is found. Luminescence lifetime measurements monitoring ⁵D₀-⁷F₂ transition of Eu³⁺ ions were performed at different excitation wavelengths for both as-prepared and annealed samples. We find two different lifetime components, which are attributed to contributions from surfaces and possibly other defects. The nanoparticles have been deposited on Ag nanostructures, which were prepared by nanosphere lithography on glass substrates. Different sizes of spheres have been used. The samples have been characterized by laser scanning confocal microscopy. Local photoluminescence spectra are used to search for possible luminescence enhancements due to plasmonic effects.