Investigation of Two-Photon Absorption Induced Excited State Absorption in a Fluorenyl-Based Chromophore

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• 作者：Changwei Li ; Kun Yang ; Yan Feng ; Xinyan Su ; Junyi Yang ; Xiao Jin ; Min Shui ; Yuxiao Wang ; Xueru Zhang ; Yinglin Song ; Hongyao Xu
• 刊名：Journal of Physical Chemistry B
• 出版年：2009
• 出版时间：December 3, 2009
• 年：2009
• 卷：113
• 期：48
• 页码：15730-15733
• 全文大小：172K
• 年卷期：v.113,no.48(December 3, 2009)
• ISSN：1520-5207

文摘

Two-photon absorption induced excited state absorption in the solution of a new fluorenyl-based chromophore is investigated by a time-resolved pump−probe technique using femtosecond pulses. With the help of an additional femtosecond open-aperture Z-scan technique, numerical simulations based on a three-energy level model are used to interpret the experimental results, and we determine the nonlinear optical parameters of this new chromophore uniquely. Large two-photon absorption cross section and excited state absorption cross section for singlet excited state are obtained, indicating a good candidate for optical limiting devices. Moreover, the influence of two-beam coupling induced energy transfer in neat N,N′-dimethylformamide solvent is also considered, although this effect is strongly restrained by the instantaneous two-photon absorption.