Modulation and mechanism of ultrafast transient spectroscopy based on dimethylamino-carbaldehyde derivatives

• 来源期刊: 中国物理B（英文版）
• 关键词: nonlinear optics transient absorption spectra dimethylamino-carbaldehyde derivatives
• 年，卷（期）: 2018,（5）
• 页码范围: 245-251
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/5/054208

摘要

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.