Department of Physics, Harbin Institute of Technology, Harbin 150001, P. R. China.
College of Chemistry and Environmental Science, Key Laboratory of Chemical Biology of Hebei Province, Hebei University, Baoding 071002, P. R. China.
J Phys Chem B. 2020 Nov 25;124(47):10766-10775. doi: 10.1021/acs.jpcb.0c07421. Epub 2020 Nov 12.
Four chalcogenophene-fused acenes containing O, S, Se, or Te, respectively, were presented, and the chalcogenophene effect on linear and nonlinear optics was systematically investigated. Their excited-state absorption performance and two-photon absorption (TPA) capacity could be modulated by the incorporating chalcogen atoms. The experimental results showed that the heavy chalcogen facilitated the intersystem crossing resulting in the presence of the triplet state absorption for and , and the TPA capacity gradually increased with the atomic size of the chalcogens. The theoretical calculation inferred that their nonlinear optical performance was closely related to the contributions of the chalcogenophene component to heterotwistacenes in the final excited state. In addition, was able to work under various laser pulses from femtoseconds to nanoseconds.
四种分别含有氧、硫、硒或碲的并噻吩稠合薁，其线性和非线性光学性质被系统地研究。通过引入杂原子，可以调节并噻吩稠合薁的激发态吸收性能和双光子吸收（TPA）能力。实验结果表明，重杂原子有利于系间窜越，从而使 和 具有三重态吸收，TPA 能力随着杂原子原子尺寸的增加而逐渐增加。理论计算推断，它们的非线性光学性能与最终激发态中杂并噻吩稠合薁组分对杂扭烯的贡献密切相关。此外， 能够在从飞秒到纳秒的各种激光脉冲下工作。
