Tunable Non-linear Refraction Properties and Ultrafast Excited State Dynamics of Dicyanomethylene Dihydrofuran Derivative

Frontiers in Chemistry

Yinglin Song¹  Linpo Yang²  Taihui Wei²  Zhongguo Li³  Liming Zhou⁴  Shaoming Fang⁴  Feng Li⁴ 

[1] College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, China;Department of Physics, Harbin Institute of Technology, Harbin, China;School of Electronic and Information Engineering, Changshu Institute of Technology, Changshu, China;School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China;

关键词: transient absorption spectra;    ultrafast dynamic process;    non-linear refractive index;    intramolecular charge transfer;    fluorescence inactivation;   

DOI  :  10.3389/fchem.2020.522974

来源: DOAJ

【 摘 要 】

The third order non-linear optical response of a dicyanomethylene dihydrofuran compound (DCDHF-2V) was investigated using a Z-scan technique in picosecond and nanosecond time regimes. The results show that DCDHF-2V has excellent excited state non-linear refraction properties on both time regimes, and the non-linear refraction index is also solvent-dependent in the nanosecond regime. The excited state relaxation dynamics of DCDHF-2V were demystified via femtosecond transient absorption spectroscopy. The TA spectra reveal that the solvent viscosities have a substantial impact on the excited state relaxation of DCDHF-2V. The exotic photophysical phenomena in DCDHF-2V reported herein can shed new light on future development of small organic non-linear optical materials with large non-linear coefficients and fast response.

【 授权许可】

Unknown