Optical spectroscopy of a polyfluorene copolymer at high pressure: intra- and intermolecular interactions.
Optical spectroscopy of a polyfluorene copolymer at high pressure: intra- and intermolecular interactions.
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DOI：
10.1103/physrevlett.99.167401
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发表时间：
2007-10
影响因子：
8.6
通讯作者：
J. Schmidtke;Ji‐Seon Kim;J. Gierschner;Carlos Silva;R. Friend
中科院分区：
文献类型：
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作者：
J. Schmidtke;Ji‐Seon Kim;J. Gierschner;Carlos Silva;R. Friend
我们提出了在高压下共轭聚合物聚（9,9-二-正辛基芴-邻苯并噻二唑）（F8BT）的光学光谱研究。F8BT薄膜的光致发光光谱在7.4 GPa时红移320mev，而F8BT薄膜的光致发光光谱在同等压力范围内红移460 meV。我们将溶液中的红移归因于链内压力效应，主要是构象平面化。链间pi电子相互作用的额外贡献解释了薄膜较大的红移。
We present optical spectroscopy studies of the conjugated polymer poly(9,9-di-n-octylfluorene-alt-benzothiadiazole) (F8BT) at high pressure. The photoluminescence spectrum of F8BT in a dilute solid-state solution in polystyrene redshifts by 320 meV over 7.4 GPa, while that of a F8BT thin film redshifts 460 meV over a comparable pressure range. We attribute the redshift in solution to intrachain pressure effects, principally conformational planarization. The additional contribution from interchain pi-electron interactions accounts for the larger redshift of thin films.