Modulation of internal conversion rate and nonlinear absorption in meso-tetraphenylporphyrins by donor/acceptor substitutes

Ao, Guanghong; Qian, Xuemin; Xiao, Zhengguo; Li, Zhongguo; Nie, Zhongquan; Wang, Yuxiao; Zhang, Xueru; Ye, Song

doi:10.1016/j.optmat.2015.05.030

Cited by 4 publications

(1 citation statement)

References 54 publications

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“…The photophysical mechanism exhibits typical characteristics of TPA-ESA in the singlet state. A three-level model with corresponding rate equations was established on the singlet state to help us describe the process of electron transition and study TPA and ESA cross sections at multiple wavelengths. , Geometry optimization of the four twistacenes was conducted by density functional theory (DFT), and in addition, the electron transition was calculated by time-dependent DFT (TD-DFT) based on the optimized structure and characterized by hole–electron analysis . The results show that the types of electron transition include LE (with the π–π* feature) and ICT.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Reverse Saturable Absorption in Substituted Twistacenes from Visible to Near-Infrared: Modulation of Terminal Twisted π-Conjugated Units

Jia

Fang

et al. 2020

J. Phys. Chem. C

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Four substituted twistacenes decorated with different twisted π-conjugated units are synthesized to investigate their structure–property relationship. To improve the nonlinear optical (NLO) response of these twistacenes, phenyl, naphthyl, anthryl, and pyrenyl are selected as the twisted units to gradually increase the population of π-electrons. Broadband excited-state absorption (ESA) and reverse saturable absorption (RSA) of these compounds show a significant enhancement in femtosecond transient absorption spectra (TAS) and multiwavelength Z-scan experiments, respectively. The photophysical mechanism exhibits a typical feature of two-photon absorption (TPA)-induced ESA (TPA-ESA) on the singlet state. With the analysis of the electron transition calculated by the time-dependent density functional theory (TD-DFT), it can be inferred that TPA and ESA of these twistacenes are modulated by intramolecular charge transfer (ICT) and local excitation (LE), respectively. The TPA cross sections of these twistacenes at 515 nm are dramatically enhanced from 214 to 534 GM by introducing ICT, while the ESA cross sections are significantly increased from 1.2 × 10–21 to 6.5 × 10–21 m2 at 690 nm via strengthening LE with the π–π* feature. The result indicates that not only can TPA and ESA be enhanced simultaneously but also the selective modulation of the nonlinear optical (NLO) properties can be achieved in such kinds of compounds.

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Section: Introductionmentioning

confidence: 99%

Enhanced Reverse Saturable Absorption in Substituted Twistacenes from Visible to Near-Infrared: Modulation of Terminal Twisted π-Conjugated Units

Jia

Fang

et al. 2020

J. Phys. Chem. C

Self Cite

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Covalent-linked porphyrin/single-walled carbon nanotube nanohybrids: synthesis and influence of porphyrin substituents on nonlinear optical performance

Zhang

et al. 2017

Carbon

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Two-parametric scaling law and figures of merit of excited-state absorption of organic dyes

Koldunov

2017

Optics Communications

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Modulation of internal conversion rate and nonlinear absorption in meso-tetraphenylporphyrins by donor/acceptor substitutes

Cited by 4 publications

References 54 publications

Enhanced Reverse Saturable Absorption in Substituted Twistacenes from Visible to Near-Infrared: Modulation of Terminal Twisted π-Conjugated Units

Enhanced Reverse Saturable Absorption in Substituted Twistacenes from Visible to Near-Infrared: Modulation of Terminal Twisted π-Conjugated Units

Covalent-linked porphyrin/single-walled carbon nanotube nanohybrids: synthesis and influence of porphyrin substituents on nonlinear optical performance

Two-parametric scaling law and figures of merit of excited-state absorption of organic dyes

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