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À propos de : Enhanced Emission Efficiency and Excited State Lifetime Due to Restricted IntramolecularMotion in Silole Aggregates        

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  • Enhanced Emission Efficiency and Excited State Lifetime Due to Restricted IntramolecularMotion in Silole Aggregates
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  • The aggregation-induced emission (AIE) properties of 1,1,2,3,4,5-hexaphenylsilole (HPS) and poly{11-[(1,2,3,4,5-pentaphenylsilolyl)oxy]-1-phenyl-1-undecyne} (PS9PA) were studied by time-resolved fluorescencetechnique. The enhanced fluorescence and long fluorescent lifetime were obtained for the sample in an aggregatestate as compared to the sample in solution. The time-decay of fluorescence of HPS and PS9PA in highviscosity solvents and low-temperature glasses has also been measured in detail to further investigate thepossible mechanism for AIE. Enhanced light emission and long fluorescence lifetime were detected for bothHPS and PS9PA in the solution-thickening and -cooling experiments. These results provided direct evidencethat the enhanced photoluminescence (PL) efficiency is due to restricted intramolecular motion, which ascribesAIE to the deactivation of nonradiative decay caused by restricted torsional motions of the molecules in thesolid state or aggregate form.
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