| Institut(e): |
Institut für Physikalische Chemie der Universität Hamburg Bundesstr. 45D-20146 Hamburg Germany Tel.: +49-40-42838-3457 Fax: +49-89-42838-3414 Photonics and Optoelectronics Group, Department of Physics and Center for NanoScience (CeNS) , University of Munich Amalienstr. 54D-80799 Munich Germany Tel.: +49-89-2180-1418 Fax: +49-89-2180-3441 |
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| Projektleiter: | Dr. Andrey Rogach | andrey.rogach@physik.uni-muenchen.de |
| Dr. John Lupton | john.lupton@physik.uni-muenchen.de | |
| PD Dr. Alexander Eychmüller | eychmuel@chemie.uni-hamburg.de | |
| Sekretariat: | +49-89-2180-3318 | |
| Mitarbeiter: | Dr. Nikolai Gaponik | gaponik@chemie.uni-hamburg.de |
| Robert Kraus | robert.kraus@physik.uni-muenchen.de | |
| Richard Capek | capek@chemie.uin-hamburg.de | |
| Abstract: The project combines topics of material chemistry and physics and aims at the use of strongly luminescent semiconductor nanocrystals (colloidal quantum dots, QDs) as a light source in different types of photonic structures. Nanocrystals emitting in the visible (500-700 nm, CdTe, CdSe/ZnS) and near- IR (750-1800 nm, Cd1-xHgxTe, HgTe) spectral ranges with room temperature quantum yields of 15-60% will be prepared using approaches of colloidal chemistry. The purposive design of the surface chemistry of nanocrystals will make their introduction in a wide range of different photonic structures possible. Factors and processes influencing the luminescence properties of nanocrystals like Auger recombination, passivation of surface traps, and photobleaching will be systematically studied either for QD ensembles or for single nanocrystals. Photonic structures selectively modified with emitting nanocrystals will include (1) heterostructured 3D colloidal photonic crystals from monodisperse latex (silica) spheres prepared as multilayered films on transparent substrates; (2) 3D inverse opals prepared by a complete impregnation of the voids of the colloidal crystals with semiconductors, followed by the removal of the latex (silica) skeleton; (3) colloidal microspheres coated by luminescent nanocrystal shells; they will be used either as whispering gallery mode structures or as local probes to couple emitters to photonic crystals and microresonators; (4) 2D metallic photonic crystals, vertical microcavities and distributed feedback gratings; (5) macroporous silicon photonic crystals produced in the MPI Halle. The influence of the photonic confinement on the emission of semiconductor nanocrystals in all fabricated structures will be studied. Recent papers: N. Gaponik, D. V. Talapin, A. L. Rogach, K. Hoppe, E. V. Shevchenko, A. Kornowski, A. Eychmüller, H. Weller, Thiol-Capping of CdTe Nanocrystals: an Alternative to Organometallic Synthetic Routes. J. Phys. Chem. B, 2002, 106, 7177. V. G. Solovyev, S. G. Romanov, C. M. Sotomayor Torres, N. Gaponik, A. Eychmüller, A. L. Rogach, Optical Characterization of the Cadmium Telluride Doped Heterostructured Photonic Crystals. In “Organic Optoelectronic Materials, Processing and Devices”, Ed: S. C. Moss, MRS Proc. Vol. 708, K7.8.1-6, 2002. S. G. Romanov, T. Maka, V. G. Solovyev, P. Ferrand, C. M. Sotomayor Torres, M. Müller, R. Zentel, N. Gaponik, A. Eychmüller, A. L. Rogach, J. Manzanares-Martinez, D. Cassagne, Photonic Crystals Based on Two-Layer Opaline Heterostructures. In “Materials and Devices for Optoelectronics and Microphotonics”, Eds: R.B. Wehrspohn, S. Noda, C. Soukoulis, R. März, MRS Proc. Vol. 722, L7.7.1-6, 2002. Cooperations within the SPP |
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