Fluorescence and Phosphorescence Anisotropy from Oriented Films of Thermally Activated Delayed Fluorescence Emitters
Fluorescence and Phosphorescence Anisotropy from Oriented Films of Thermally Activated Delayed Fluorescence Emitters
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DOI：
10.1021/acs.jpclett.7b00729
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发表时间：
2017-07-06
影响因子：
5.7
通讯作者：
Monkman, Andrew P.
中科院分区：
文献类型：
--
作者：
Higginbotham, Heather F.;Etherington, Marc. K.;Monkman, Andrew P.
使用稳态荧光偏振法观察了三种TADF材料的各向异性。这种技术允许观察稀释溶液中的偏振差异，以及未拉伸和拉伸的薄膜;后者在样品中产生高度对齐的分子。使用这些对准的膜，可以在来自（LE）-L-1和（CT）-C-1状态的发射之间以及在激发不同的吸收带时观察到各向异性的差异。此外，从时间分辨测量观察到的极化突出了电荷转移和本地三重态之间的强振动耦合。
Anisotropy within three TADF materials has been observed using steadystate fluorescence polarization. This technique has allowed for the observation of differences in polarization within dilute solution, and both unstretched and stretched films; the latter producing highly aligned molecules within the sample. Using these aligned films differences in anisotropy can be observed between the emission from the (LE)-L-1 and (CT)-C-1 states and upon exciting different absorption bands. Furthermore, polarization observed from time-resolved measurements highlights the strong vibronic coupling between charge-transfer and local triplet states.