Ren Yan, Lam Jacky W Y, Dong Yongqiang, Tang Ben Zhong, Wong Kam Sing
Department of Physics and Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
J Phys Chem B. 2005 Jan 27;109(3):1135-40. doi: 10.1021/jp046659z.
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 fluorescence technique. The enhanced fluorescence and long fluorescent lifetime were obtained for the sample in an aggregate state as compared to the sample in solution. The time-decay of fluorescence of HPS and PS9PA in high viscosity solvents and low-temperature glasses has also been measured in detail to further investigate the possible mechanism for AIE. Enhanced light emission and long fluorescence lifetime were detected for both HPS and PS9PA in the solution-thickening and -cooling experiments. These results provided direct evidence that the enhanced photoluminescence (PL) efficiency is due to restricted intramolecular motion, which ascribes AIE to the deactivation of nonradiative decay caused by restricted torsional motions of the molecules in the solid state or aggregate form.
采用时间分辨荧光技术研究了1,1,2,3,4,5-六苯基硅杂环戊二烯（HPS）和聚{11-[(1,2,3,4,5-五苯基硅杂环戊二烯基)氧基]-1-苯基-1-十一炔}（PS9PA）的聚集诱导发光（AIE）性质。与溶液中的样品相比，聚集态样品表现出增强的荧光和较长的荧光寿命。还详细测量了HPS和PS9PA在高粘度溶剂和低温玻璃中的荧光时间衰减，以进一步研究AIE的可能机制。在溶液增稠和冷却实验中，HPS和PS9PA均检测到增强的发光和较长的荧光寿命。这些结果提供了直接证据，表明光致发光（PL）效率的提高是由于分子内运动受限，这将AIE归因于固态或聚集态分子扭转运动受限导致的非辐射衰变失活。
