Tuning interfacial charge-transfer excitons at polymer-polymer heterojunctions under hydrostatic pressure

被引：21
|
作者：
Schmidtke, Johanna P. [1 ]
Friend, Richard H. [1 ]
Silva, Carlos [2 ]
机构：
[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
[2] Univ Montreal, Dept Phys Regroupement Quebecois Mat Pointe, Montreal, PQ H3C 3J7, Canada
来源：
PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 15期
关键词：
D O I：
10.1103/PhysRevLett.100.157401
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present photoluminescence spectroscopy of blend thin films of poly(9,9-di-n-octylfluorene- alt-benzothiadiazole) (F8BT) with electron-donating copolymers under hydrostatic pressure. The photoluminescence spectrum of F8BT redshifts by 530 +/- 60 meV over pressures of 0.1 MPa-8.8 GPa. That of the interfacial charge-transfer exciton redshifts by 270-370 meV over a similar pressure range. Despite the relatively small shift of the charge-transfer exciton, the excited state dynamics at the molecular heterojunction are strongly enhanced due to the decreasing intermolecular distance, leading to favored exciplex emission.
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页数：4
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