| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Two-Photon Fluorescence Property and Ultrafast Dynamics of Two Dipolar Compounds with Dipicolinate as Electron Acceptor |
| WANG Yao-Chuan1,2, ZHOU Hui1,2, DING Jin-Liang1,2, CHEN Qiang1,2, XIAO Hai-Bo3, TAO Xiao-Ming3, QIAN Shi-Xiong1 |
| 1Department of Physics, Fudan University, Shanghai 200433 2Surface Physics Laboratory (State Key Laboratory), Fudan University, Shanghai 200433 3Department of Chemistry, Shanghai Normal University, Shanghai 200234 |
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WANG Yao-Chuan, ZHOU Hui, DING Jin-Liang et al 2010 Chin. Phys. Lett. 27 038201 |
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Abstract Linear and nonlinear photophysical properties of two novel dipolar compounds named as trans- dimethyl-4-[4'-(N,N-dimethylamino)-styry1]-pyridin-2,6-dicarboxylate (Xiao-1) and trans-dimethyl-4-[4'-(N,N-diphenylamino)-styry1]-pyridin-2,6-dicarboxylate (Xiao-2) are investigated by steady-state absorption and fluorescence spectroscopy, Z-scan and two-photon excited fluorescence measurements. Strong two-photon fluorescence emission and the pronounced positive solvatochromism are observed from two compounds. The two-photon absorption cross section of Xiao-2 is about 1.5 times larger than that of Xiao-1. One-color and two-color femtosecond pump-probe experiments are employed to investigate the excited state dynamics of two compounds. The relaxation lifetime of the intra-molecular charge transfer state is determined to be in the hundreds of picosecond domain for both the compounds in THF, and several tens of picosecond in DMSO solutions.
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| Keywords:
82.53.Uv
33.80.Rv
42.65.Re
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Received: 16 October 2009
Published: 09 March 2010
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| PACS: |
82.53.Uv
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(Femtosecond probes of molecules in liquids)
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33.80.Rv
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(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))
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42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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