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Berlin 2005 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 21: Nanoparticles

CPP 21.4: Talk

Tuesday, March 8, 2005, 10:30–10:45, TU C243

Energy Transfer in Supramolecular Assemblies of Semiconductor Nanoparticles and Porphyrins — •Thomas Blaudeck1, Edvard Zenkevich2, Alexander Shulga2, Frank Cichos1, and Christian von Borczyskowski31Photonics and Optical Materials, Institute of Physics, TU Chemnitz, 09107 Chemnitz, Germany — 2Institute of Molecular and Atomic Physics, National Academy of Science, Minsk 220072, Belarus — 3Optical Spectroscopy and Molecular Physics, Institute of Physics, TU Chemnitz, 09107 Chemnitz, Germany

We report on an efficient energy transfer process in colloidal systems of semiconducter nanoparticles (NPs) and organic dyes. The focus is set on assemblies of CdSe core NPs and tetra-(m-pyridyl)-porphyrin molecules dispersed in toluene. Steady-state titration experiments show an inhibition of the NP emission with increasing porphyrin concentration. For such an assembly, the porphyrin emission intensity is enhanced. Photoluminescence excitation spectra at porphyrin emission also reveal a significant influence of the NP concentration. These facts are confirmed by time-resolved photoluminescence measurements as they clearly show a raising component on the molecules emission band in presence of the NP. We interpret these resuls as proof for self-organization of the porphyrins on the NP surface and a directed energy transfer from the NP to the molecule.

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