交叉共轭查尔酮衍生物的增强的双光子吸收：有效π共轭结构的调制。,The Journal of Physical Chemistry A

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交叉共轭查尔酮衍生物的增强的双光子吸收：有效π共轭结构的调制。
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2020-12-15 , DOI: 10.1021/acs.jpca.0c08656
Jidong Jia _{1,

2} , Xueru Zhang ₁ , Yuxiao Wang ₁ , Yufang Shi ₃ , Jinyu Sun ₃ , Junyi Yang ₄ , Yinglin Song _{1,

2,

4}

Affiliation

三种交叉共轭查耳酮衍生物T3CT，T3CP2和T3CP3被设计和合成以开发出色的有机非线性光学（NLO）材料。在Z扫描实验中，所有化合物在可见光到近红外区域均显示出良好的NLO吸收特性。光物理机制被证实是两光子吸收（TPA）诱导的激发态吸收（ESA）。在瞬态吸收光谱（TAS）中观察到的分子内电荷转移（ICT）会显着影响分子NLO特性。我们将主导交叉共轭结构中电子跃迁过程的π共轭体系定义为有效的π共轭结构。电子跃迁分析表明，足够强的ICT可以有效地扩展这些交叉共轭结构中的有效π共轭结构。这些化合物在650和750 nm处的TPA截面仅在17–97 GM范围内。但是，通过扩展有效的π共轭结构，我们实现了580 nm（1737-2027 GM）TPA截面的显着增强。在580 nm飞秒激光脉冲的激发下，所有化合物均表现出出色的OL性能，最小OL阈值为4.71×10^–3 J / cm ²。结果表明，这些交叉共轭查尔酮衍生物在OL中具有广阔的应用前景，并且通过调节有效的π共轭结构可以有效提高其NLO性能。

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Enhanced Two-Photon Absorption of Cross-Conjugated Chalcone Derivatives: Modulation of the Effective π-Conjugated Structure

Three cross-conjugated chalcone derivatives T3CT, T3CP2, and T3CP3 were designed and synthesized to develop excellent organic nonlinear optical (NLO) materials. In a Z-scan experiment, all compounds show good NLO absorption characteristics in the visible to near-infrared region. The photophysical mechanism is confirmed to be two-photon absorption (TPA)-induced excited-state absorption (ESA). Intramolecular charge transfer (ICT) observed in transient absorption spectra (TAS) significantly affects molecular NLO properties. We define the π-conjugated system that dominates the electron transition process in the cross-conjugated structure as the effective π-conjugated structure. Electron transition analysis shows a sufficiently strong ICT can effectively expand the effective π-conjugated structure in these cross-conjugated structures. The TPA cross sections of these compounds at 650 and 750 nm are only in the range of 17–97 GM. However, we achieve a significant enhancement of the TPA cross section at 580 nm (1737–2027 GM) by extending the effective π-conjugated structure. Excited by 580 nm femtosecond laser pulses, all compounds exhibit excellent OL performance and the minimum OL threshold is 4.71 × 10^–3 J/cm². The results show that these cross-conjugated chalcone derivatives have promising applications in OL, and their NLO performance can be effectively improved by modulating the effective π-conjugated structure.

更新日期：2020-12-24

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