| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Modulation and mechanism of ultrafast transient spectroscopy based on dimethylamino-carbaldehyde derivatives |
| Tong-xing Jin(金桐兴)1, Jun-yi Yang(杨俊义)1, Yu Fang(方宇)2, Yan-bing Han(韩艳兵)3, Ying-lin Song(宋瑛林)1,3 |
1 College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215006, China;
2 Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, China;
3 Department of Physics, Harbin Institute of Technology, Harbin 150001, China |
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Abstract Two dimethylamino-carbaldehyde derivatives with different π-bridge lengths were prepared, and their transient optical properties and photophysical mechanisms were investigated by transient absorption spectroscopy and Z-scan measurements. Owing to the difference in molecular structures, the two compounds exhibit different populations of locally excited states and, therefore, they also produce different transient absorption spectra. After photoexcitation, both molecular materials exhibit a wide excited state absorption band from 450 nm to 1000 nm. Meanwhile, the excited state lifetimes are dramatically different, 2 ns and 100 ps, for the two molecules. A figure of merit greater than 2 at the wavelength of 1000 nm is obtained. The results show that modulating the population of the locally excited states in this type of molecule can be a promising approach for obtaining optical switching and solar cell materials.
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Received: 28 September 2017
Revised: 30 January 2018
Accepted manuscript online:
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PACS:
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42.50.Md
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(Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)
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78.47.jb
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(Transient absorption)
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42.70.Nq
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(Other nonlinear optical materials; photorefractive and semiconductor materials)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.U1630103 and 11704273),Natural Science Foundation of Jiangsu Province,China (Grant No.BK20170375),and Natural Science Foundation of the Higher Education Institutions of Jiangsu Province,China (Grant No.17KJB140021). |
Corresponding Authors:
Ying-lin Song
E-mail: ylsong@hit.edu.cn
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Cite this article:
Tong-xing Jin(金桐兴), Jun-yi Yang(杨俊义), Yu Fang(方宇), Yan-bing Han(韩艳兵), Ying-lin Song(宋瑛林) Modulation and mechanism of ultrafast transient spectroscopy based on dimethylamino-carbaldehyde derivatives 2018 Chin. Phys. B 27 054208
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