Authors: S.A. Ponomarenko, O.V. Borshchev, Y.N. Luponosov, N.M. Surin, A.M. Muzafarov
Affilation: Institute of Synthetic Polymeric Materials of Russian Academy of Sciences, Russian Federation
Pages: 756 - 759
Keywords: luminophores, spectral shifters, scintillators
During the last years the number of light-harvesting luminescent dendrimers has increased rapidly. One of the most interesting features of the dendrimers is a possibility of incorporation of different chromophores within one dendritic molecule that can lead to efficient intramolecular directional energy transfer from their peripheries to the centre (the so-called “dendritic molecular antenna” effect). In this work we report on the synthesis and investigation of the organosilicon molecular antennas based on new oligoarylsilane compounds with different branching topology: dendrimers and “butterfly”-like molecules. Photoluminescence study of the new molecules has shown an intramolecular energy transfer with the efficiency up to 99% and luminescence quantum yield up to 87%. We applied these novel nanostructured materials as luminescent additives in polystyrene for new highly effective spectral shifters and plastic scintillators (radiation detectors). Since two different luminophores are fixed properly on the nanoscale distance within the same branching molecule such a way that the efficient intramolecular energy transfer between them occurs, both the scintillating efficiency and the emitting time of the plastic scintillators are significantly improved. This lead to a new type of plastic scintillating devices based on the nanostructured organosilicon luminophores.
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