Prof. Dr. Stanislav Balouchev
Stanislav Balouchev studied laser physics at the Sofia University "St.Kliment Ochridski", Bulgaria, where he received his M.Sci. in 1990. In 1995 he finished his PhD in the field of dark spatial solitons at the Quantum Electronics and Laser Physics Department, Sofia University. In 1996, he was granted a DAAD- research fellowship and spent a year in the group of Prof. Dr. B. Welegehausen, Hannover University, Germany. Since 1995 he has also been affiliated as assistant professor in the Technical University Sofia, Bulgaria. In 1997 he was visiting scientist at the Institute of Experimental Physics, Technical University of Graz, Austria in the group of Prof. Dr. L.Windholz. In 1999 he was granted a Feinberg research fellowship at the Department of Complex Systems, Weizmann Institute of Science, Rehovot, Israel in the group of Dr. N. Davidson. In 2000 he started his Maria-Curie fellowship in the group of Prof. F. Riehle at PTB, Braunschweig, Germany. In 2001, he joined the group of Prof. Dr.G. Wegner and in 2008 the group of Prof. Dr. K. Landfester at MPIP. In 2009 he habilitates at Optics and Spectroscopy Department, Faculty of Physics, Sofia University, Bulgaria. His current research interests include nonlinear optics, atomic physics (coherent population trapping, laser cooling), optical properties of conjugated polymers and the process of annihilation upconversion in multicomponent organic systems.
- S. Baluschev, Fang Yu, Tzenka Miteva, Stefanie Ahl, Akio Yasuda, Gabriele Nelles, Wolfgang Knoll and Gerhard Wegner, “Metal Enhanced Up-Conversion Fluorescence: effective Triplet-Triplet Annihilation near Silver Surface” NanoLetters 5, (12) 2482-2484, 2005.
- S. Baluschev, T. Miteva, V. Yakutkin, G. Nelles, A. Yasuda, and G. Wegner, “Up-Conversion Fluorescence: Non-coherent Excitation by Sun-light”, Physical Review Letters 97 (14): 143903, 2006.
- S. Baluschev, T. Miteva, V. Yakutkin, Y. S. Avlasevich, K. Müllen, G. Nelles, S. Chernov, S. Aleshchenkov, A. Cheprakov, A. Yasuda and G. Wegner, “Blue-Green Up-Conversion: Non-coherent Excitation by NIR-light”, Angewandte Chemie- International Edition 46(40), 7693–7696, 2007.
- F. Marsico, A. Turshatov, R. Peköz, Yu. Avlasevich, M. Wagner, K. Weber, D. Donadio, K. Landfester, S. Baluschev, and F. R Wurm, „Hyperbranched Unsaturated Polyphosphates as Protective Matrix for Long-Term Photon Upconversion in Air“ J. Am. Chem. Soc., just accepted manuscript, 2014, DOI: 10.1021/ja5049412.
- A. J Svagan, D. Busko, Yu. Avlasevich, G. Glasser, S. Baluschev, and K. Landfester, “Photon Energy Upconverting Nanopaper: A Bioinspired Oxygen Protection Strategy” ACS Nano, just accepted manuscript, 2014, DOI: 10.1021/nn502496a.
Energy Transport in Dense Populated Organic Triplet Ensembles
Sunlight is believed to be the energy source of the future; however, a great part of low energy photons are lost during conventional photovoltaic / photochemical processes. Photon energy upconversion is a highly promising way to make use of these low energy photons. Triplet-triplet annihilation photon energy upconversion (TTA-UC) is the only upconversion method that has been experimentally demonstrated to operate with noncoherent low intensity illumination such as sunlight.
The aim of the proposal is to explore the intermolecular and intramolecular energy transport, controlled by structural and environmental characteristics in chemically engineered macromolecular organic systems. Partial objectives are:
To create model, describing the dependences on experimental parameters such as local molecular mobility, local oxygen contamination and mutual molecular steric alignment. It was demonstrated experimentally substantial difference between the characteristic behaviour of the TTA – UC process in soft-matter environment and in solid-state matrix (organic crystals).
The process of TTA – UC delivers unique information about the absolute value of the local temperature or dynamical oxygen concentration in microscopic objects, even living objects.