Anhui Province Key Laboratory of Optoelectric Materials Science and Technology, Department of Physics, Anhui Normal University, Anhui, Wuhu 241000, China.
Phys Chem Chem Phys. 2023 Mar 8;25(10):7508-7518. doi: 10.1039/d2cp05659c.
It has been shown that -stilbene (TSB) has great potential as an ultrafast optical limiting material through the process of three-photon absorption (3PA)-induced excited state absorption (ESA). The present paper shows that the main transitions in the absorption bands of TSB are mostly local excitation. In order to improve the optical limiting performance of TSB, a series of TSB derivatives with an electron donor-π-acceptor structure are designed. The analysis of π electron localized orbital locators (LOL-π) reveals that the distribution of π electrons in the derivatives of TSB is much more continuous compared to that in the original TSB. This results in the main transitions in the ground state absorption (GSA) and ESA of the TSB derivatives showing obvious charge transfer characteristics, and the GSA, ESA and 3PA bands are largely enhanced and broadened compared to those of the original TSB molecule. These observations are well supported by the enlarged transition dipole moments of the main transitions in GSA and ESA. With these results, it is clearly shown that the TSB derivatives are promising optical limiting materials. Our observations provide clues for the development of optical limiting materials based on TSB.
已经表明，- 二苯乙烯（TSB）通过三光子吸收（3PA）诱导的激发态吸收（ESA）过程，具有成为超快光限幅材料的巨大潜力。本文表明，TSB 吸收带中的主要跃迁主要是局域激发。为了提高 TSB 的光限幅性能，设计了一系列具有给体-π-受体结构的 TSB 衍生物。π 电子局域轨道定位器（LOL-π）的分析表明，与原始 TSB 相比，TSB 衍生物中π 电子的分布更加连续。这导致 TSB 衍生物的基态吸收（GSA）和 ESA 中的主要跃迁表现出明显的电荷转移特征，与原始 TSB 分子相比，GSA、ESA 和 3PA 带得到了很大的增强和展宽。这些观察结果得到了 GSA 和 ESA 中主要跃迁的增大跃迁偶极矩的很好支持。有了这些结果，很明显，TSB 衍生物是很有前途的光限幅材料。我们的观察结果为基于 TSB 的光限幅材料的发展提供了线索。
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