Z. Naturforsch. 2014, 69b, 263 – 274
Bidirectional Photoinduced Energy Transfer in Nanoassemblies of Quantum Dots and Luminescent Metal Complexes
Srinidhi Ramachandra1, Cristian Alejandro Strassert2, David N. Reinhoudt1, Daniel Vanmaekelbergh3, and Luisa De Cola1,2,4
1 Laboratory of Supramolecular Chemistry and Technology, and MESA+ Institute of Nanotechnology, University of Twente, P. O. Box 217, 7500 AE Enschede, The Netherlands
2 Physikalisches Institut and Center for Nanotechnology (CeNTech) Westfälische Wilhelms-Universität Münster, Heisenbergstraße11, D-48149 Münster, Germany
3 Condensed Matter and Interfaces, Debye Institute, University of Utrecht, P. O. Box 80.000, 3508 TA Utrecht, The Netherlands
4 Current address: Université de Strasbourg – Institut de Science et d'Ingénierie Supramoléculaires (ISIS), 8 Alleé Gaspard Monge, 67083 Strasbourg, France S. Ramachandra and C. A. Strassert have equally contributed to the paper.
Reprint requests to Prof. Luisa De Cola. E-mail: decola@unistra.fr
Received December 11, 2013 / published online February 17, 2014
This work describes the synthesis and photophysical characterization of Ir(III) and Ru(II) complexes bearing terminal amino groups, which act as anchoring units for the attachment to quantum dots, QDs. The photophysical properties of the metal complexes in combination with different types of QDs, allows directional photoinduced processes in the assemblies. In particular, we show photoinduced energy transfer from the luminescent excited Ir(III) unit to the CdTe nanocrystals, with an efficiency of 40 %. The directionality was then inverted by employing an emitting Ru(II) complex as energy acceptor, in combination with photoluminescent CdSe/ZnS quantum dots. The efficiency of the photoinduced energy transfer from the nanocrystals to the Ru(II) center was estimated to be as high as 75 %. This work provides model systems for nanoassemblies based on quantum dots and metal complexes for optoelectronic applications, and as active light-harvesting systems.
Key words: Luminescent Metal Complexes, Quantum Dots, Nanoassemblies, Photoinduced Energy Transfer
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