Femtosecond Pump鈥揚ush鈥揚robe and Pump鈥揇ump鈥揚robe Spectroscopy of Conjugated Polymers: New Insight and Opportunities

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• 作者：Tak W. Kee
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2014
• 出版时间：September 18, 2014
• 年：2014
• 卷：5
• 期：18
• 页码：3231-3240
• 全文大小：449K
• ISSN：1948-7185

文摘

Conjugated polymers are an important class of soft materials that exhibit a wide range of applications. The excited states of conjugated polymers, often referred to as excitons, can either deactivate to yield the ground state or dissociate in the presence of an electron acceptor to form charge carriers. These interesting properties give rise to their luminescence and the photovoltaic effect. Femtosecond spectroscopy is a crucial tool for studying conjugated polymers. Recently, more elaborate experimental configurations utilizing three optical pulses, namely, pump鈥損ush鈥損robe and pump鈥揹ump鈥損robe, have been employed to investigate the properties of excitons and charge-transfer states of conjugated polymers. These studies have revealed new insight into femtosecond torsional relaxation and detrapping of bound charge pairs of conjugated polymers. This Perspective highlights (1) the recent achievements by several research groups in using pump鈥損ush鈥損robe and pump鈥揹ump鈥損robe spectroscopy to study conjugated polymers and (2) future opportunities and potential challenges of these techniques.