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Plasmonic enhancement of blue emission from ZnO nanorods grown on the anodic aluminum oxide (AAO) template
Authors:Małgorzata Norek  Grzegorz Łuka  Marek Godlewski  Tomasz Płociński  Marta Michalska-Domańska  Wojciech J Stępniowski
Institution:1. Faculty of Advanced Technologies and Chemistry, Military University of Technology, 2 Kaliskiego Str., 00-908, Warsaw, Poland
2. Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668, Warsaw, Poland
3. Faculty of Materials Science and Engineering, Warsaw University of Technology, 141 Wo?oska Str., 02-507, Warsaw, Poland
Abstract:Luminescent properties of ZnO nanorods covered with Ag nanoparticles are examined. Nanorods were synthesized on AAO templates using Atomic Layer Deposition (ALD) technique. Two types of the samples were prepared with different arrangement of ZnO nanorods and doping conditions. Nanorods of the second type were codoped with Al, to stimulate defect-related emissions. The ZnO material fills heterogeneously the interior of the AAO nanopores and has hexagonal, wurtzite structure. Both types of structures exhibit a broad defect-related emission at about 440 nm, most probably related to recombination at zinc interstitial (Zni) defects. This emission in samples with a random distribution of ZnO:Al nanorods and finer Ag nanoparticles is enhanced by factor of ~2.5 upon Ag deposition. The so-obtained material is interesting from the point of view of its application in blue range emitting diodes.
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