Green Adam P, Buckley Alastair R
The Electronic and Photonic Molecular Materials Group (EPMM), The Physics and Astronomy Department, The University of Sheffield, Sheffield, S3 7RH, England.
Phys Chem Chem Phys. 2015 Jan 14;17(2):1435-40. doi: 10.1039/c4cp05244g.
In this study the concentration quenching phenomenon is explored for seven organic singlet emitters (Rhodamine 6G, Pyridine 2, Lumogen F Red 305, Perylene, Coumarin 102, DCM and DCJTB) in an inert host of poly(methyl methacrylate) (PMMA). Combining fluorescence lifetime and quantum yield measurements on samples of different molecular separation allows a deep decay rate analysis to be performed yielding, for each fluorophore, a monomial power law that indicates the strength and type of interaction. The fluorophores studied exhibit interactions in between that of FRET-like dipole-dipole (R(-6)) and surface-surface (R(-2)) with many lying close to that expected for surface-dipole (R(-3)) interactions. With no observed dependence on molecular structure it is concluded that the concentration quenching rate in singlet emitters follows a power law as kCQ = aR(-3.1±0.7) with aggregation expected to increase the magnitude of the observed power.
在本研究中，对七种有机单线态发光体（罗丹明6G、吡啶2、Lumogen F Red 305、苝、香豆素102、二氯甲烷和DCJTB）在聚甲基丙烯酸甲酯（PMMA）惰性主体中的浓度猝灭现象进行了探索。结合对不同分子间距样品的荧光寿命和量子产率测量，能够进行深入的衰减率分析，从而为每个荧光团得出一个单项式幂律，该幂律表明了相互作用的强度和类型。所研究的荧光团表现出介于类FRET偶极 - 偶极（R(-6)）和表面 - 表面（R(-2)）相互作用之间的相互作用，许多接近表面 - 偶极（R(-3)）相互作用所预期的情况。由于未观察到对分子结构的依赖性，得出结论：单线态发光体中的浓度猝灭速率遵循幂律，即kCQ = aR(-3.1±0.7)，预计聚集会增加所观察到的幂的大小。
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