Investigation of two-photon absorption properties in branched alkene and alkyne chromophores

被引:241
作者
Bhaskar, Ajit
Ramakrishna, Guda
Lu, Zhikuan
Twieg, Robert
Hales, Joel M.
Hagan, David J.
Van Stryland, Eric
Goodson, Theodore, III [1 ]
机构
[1] Univ Michigan, Dept Chem, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Dept Macromol Sci & Engn, Ann Arbor, MI 48109 USA
[3] Kent State Univ, Dept Chem, Kent, OH 44242 USA
[4] Univ Cent Florida, CREOL, Sch Opt, Orlando, FL 32816 USA
关键词
D O I
10.1021/ja060630m
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Novel alkene and alkyne branched structures have been synthesized, and their two-photon absorption (2PA) properties are reported. This series of alkene and alkyne trimer systems tests the mechanistic approach for enhancing the 2PA process which is usually dictated by the pi-bridging, delocalization length, and corresponding charge transfer on the 2PA cross sections. The results suggest that alkene branched systems have higher 2PA cross sections. While steady-state absorption and emission measurements were not successful in predicting the observed trend of 2PA cross sections, time-resolved measurements have explained the trends observed. It was found that, upon photoexcitation, there is an ultrafast charge localization to an intramolecular charge-transfer (ICT) state, followed by the presence of a solvent and conformationally relaxed ICT state ' in these branched systems.
引用
收藏
页码:11840 / 11849
页数:10
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