Dendritic Oligoarylsilanes as Effective Nanostructured Luminophores for Spectral Shifters and Plastic Scintillators

摘要

In this work we report on synthesis and investigation of the organosilicon "molecular antennas" based on new oligoarylsilane compounds with different branching topology: dendrimers and "butterfly'Mike molecules. Photoluminescence study of the new nanostructured molecules has shown an intramolecular energy transfer with the efficiency up to 99% and luminescence quantum yield up to 85%. 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.