Ultrafast responses of two V-shaped compounds with a reverse conjugated structural configuration: an investigation of the reason for the enhanced two-photon absorption cross-section

Wang, Yaochuan; Jiang, Yihua; Liu, Dajun; Wang, Yizhuo; Wang, Guiqiu; Hua, Jing

doi:10.1007/s00340-018-6972-3

Cited by 12 publications

(3 citation statements)

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“…Organic ICT compounds are ideal candidates as third-order nonlinear optical materials because of their inherent high hyperpolarizabilities [35][36][37]. Among these molecules, the quadrupolar D-π-A-π-D structure is highlighted for its excellent nonlinear optical properties [38][39][40][41], with large twophoton absorption (TPA) cross-sections [42,43]. The intramolecular charge transfer, which occurs in systems containing both donor and acceptor parts, will influence the TPA properties strongly [44,45].…”

Section: Introductionmentioning

confidence: 99%

Solvent dependent linear and nonlinear optical properties of triphenylamine unit incorporated difluoroboron β-diketonate complexes

Zhou

Semin³

et al. 2019

Dyes and Pigments

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Article 25fa pilot End User Agreement This publication is distributed under the terms of Article 25fa of the Dutch Copyright Act (Auteurswet) with explicit consent by the author. Dutch law entitles the maker of a short scientific work funded either wholly or partially by Dutch public funds to make that work publicly available for no consideration following a reasonable period of time after the work was first published, provided that clear reference is made to the source of the first publication of the work. This publication is distributed under The Association of Universities in the Netherlands (VSNU) 'Article 25fa implementation' pilot project. In this pilot research outputs of researchers employed by Dutch Universities that comply with the legal requirements of Article 25fa of the Dutch Copyright Act are distributed online and free of cost or other barriers in institutional repositories. Research outputs are distributed six months after their first online publication in the original published version and with proper attribution to the source of the original publication. You are permitted to download and use the publication for personal purposes. All rights remain with the author(s) and/or copyrights owner(s) of this work. Any use of the publication other than authorised under this licence or copyright law is prohibited. If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons.

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Section: Introductionmentioning

confidence: 99%

Solvent dependent linear and nonlinear optical properties of triphenylamine unit incorporated difluoroboron β-diketonate complexes

Zhou

Semin³

et al. 2019

Dyes and Pigments

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“…The dynamics curve probed at a wavelength of 680 nm for compound P-HPcZn is shown in Figure 6a, which exhibits a positive excited state absorption signal. The ultrafast dynamics curve can be divided into two processes, the shorter time constant τ 1 may be related to the vibrational cooling of the locally excited (LE) single state; 46 the second process greater than 1000 ps mainly corresponds to the slow relaxation process of the particles in the LE state to the ground state. 47 While the obtained dynamics curve at the special photobleaching region is affected by fluorescence emission, which can be observed from the evolution process of dynamics curves probed from 700 to 710, and 780 nm, respectively.…”

Section: Ultrafast Excited State Dynamics Studymentioning

confidence: 99%

One- and Two-Photon Photophysical Properties, Ultrafast Dynamics, and DFT Study of Three Modified Zinc Phthalocyanines

Zhang,

Wang,

Meng

et al. 2024

J. Phys. Chem. A

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As two-photon absorption (TPA) materials, phthalocyanine molecules have promising application prospects due to their large TPA absorption cross-section, high thirdorder nonlinear optical susceptibility, and ultrafast response characteristics. In this work, optical properties and the ultrafast response of three modified zinc phthalocyanine molecules (P-HPcZn, Pc-P-Pc, and (DR1) 4 PcZn) were analyzed. No obvious side-shoulder absorption peaks in the Q-band can be observed from the steady-state absorption spectra of the three molecules, confirming the lack of aggregation products in the solutions of our measurement. Open-aperture Z-scan results show relatively large TPA cross-section values of 136.4 and 55.3 GM for Pc-P-Pc and (DR1) 4 PcZn, respectively. The nonlinear optical results show that the absorption process observed under the excitation of femtosecond pulses is a reverse saturable absorption (RSA) mechanism. Up-conversion fluorescence spectra of (DR1) 4 PcZn in THF solution indicate that the fluorescence emission mechanism is TPA. In the study of ultrafast dynamics, the transient absorption spectra were investigated and the decay lifetime of the dynamic traces corresponding to some representative probe wavelengths was obtained through data fitting with a multi-exponential function. Finally, the charge transfer and excited state properties of the modified zinc phthalocyanine molecules were discussed in depth by the DFT method. The energy gaps of P-HPcZn, Pc-P-Pc, and (DR1) 4 PcZn are 2.16, 1.39, and 2.13 eV, respectively. The results indicate that the Pc-P-Pc of donor−acceptor−donor (D-A-D) structure has the smallest energy gap as well as the best charge transfer properties.

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“…As mentioned previously, several different strategies can be utilized in order to enhance the TPA cross-section of compounds, such as extending the π-conjugation backbone [145], the introduction of strong electron acceptor and/or donor groups at the center or at the terminal parts of the molecule [146,147], increasing the amount of branching of the molecule Different functional groups including bromine, thiophene, and ethynylthiophene were introduced at the 7, 12-positions of the truxene moiety in order to further extend the π-conjugation and thus improve the TPA properties of the resulting structures. As mentioned previously, several different strategies can be utilized in order to enhance the TPA crosssection of compounds, such as extending the π-conjugation backbone [145], the introduction of strong electron acceptor and/or donor groups at the center or at the terminal parts of the molecule [146,147], increasing the amount of branching of the molecule [148,149], and (or) improving the co-planarity of the molecules [150]. The unsubstituted compounds 20 and 24 displayed the characteristic absorption band of the truxene core at 307 nm, while for the bromine-substituted compounds 21 and 25, it was 313 nm and 307 nm, respectively.…”

Section: Bodipysmentioning

confidence: 99%

Prospects for More Efficient Multi-Photon Absorption Photosensitizers Exhibiting Both Reactive Oxygen Species Generation and Luminescence

et al. 2021

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The use of two-photon absorption (TPA) for such applications as microscopy, imaging, and photodynamic therapy (PDT) offers several advantages over the usual one-photon excitation. This creates a need for photosensitizers that exhibit both strong two-photon absorption and the highly efficient generation of reactive oxygen species (ROS), as well as, ideally, bright luminescence. This review focuses on different strategies utilized to improve the TPA properties of various multi-photon absorbing species that have the required photophysical properties. Along with well-known families of photosensitizers, including porphyrins, we also describe other promising organic and organometallic structures and more complex systems involving organic and inorganic nanoparticles. We concentrate on the published studies that provide two-photon absorption cross-section values and the singlet oxygen (or other ROS) and luminescence quantum yields, which are crucial for potential use within PDT and diagnostics. We hope that this review will aid in the design and modification of novel TPA photosensitizers, which can help in exploiting the features of nonlinear absorption processes.

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Ultrafast responses of two V-shaped compounds with a reverse conjugated structural configuration: an investigation of the reason for the enhanced two-photon absorption cross-section

Cited by 12 publications

References 50 publications

Solvent dependent linear and nonlinear optical properties of triphenylamine unit incorporated difluoroboron β-diketonate complexes

Solvent dependent linear and nonlinear optical properties of triphenylamine unit incorporated difluoroboron β-diketonate complexes

One- and Two-Photon Photophysical Properties, Ultrafast Dynamics, and DFT Study of Three Modified Zinc Phthalocyanines

Prospects for More Efficient Multi-Photon Absorption Photosensitizers Exhibiting Both Reactive Oxygen Species Generation and Luminescence

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