A comprehensive picture of the ultrafast excited-state dynamics of retinal

Flender, Oliver; Scholz, Mirko; Hölzer, Jonas I.; Oum, Kawon; Lenzer, Thomas

doi:10.1039/c6cp01335j

Cited by 12 publications

(20 citation statements)

References 52 publications

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“…This is likely due to a sufficiently high energy barrier suppressing interconversion between the S 1 and ICT species, as known from other molecular systems, such as all-trans retinal. 32 The biexponential decay observed for D49 on Al 2 O 3 also contains contributions from surface inhomogeneity resulting in a range of adsorption sites of different local polarity. The local polarity around the dye on Al 2 O 3 is efficiently reduced by introducing nonpolar DCA spacer molecules.…”

Section: Discussionmentioning

confidence: 99%

“…In the second PSCP setup, [29][30][31][32] a UV-Vis multifilament supercontinuum spanning a wavelength range of 260-660 nm was generated in a translating 2 mm thick CaF 2 plate from the second harmonic (400 nm, 12 mJ pulse À1 ) of the fundamental beam of a regeneratively amplified titanium:sapphire system (Coherent Libra USP-HE, 800 nm, 50 fs, 3.5 mJ pulse À1 ).…”

Section: Pump -Supercontinuum Probe (Pscp) Spectroscopymentioning

confidence: 99%

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Excited-state relaxation of the solar cell dye D49 in organic solvents and on mesoporous Al₂O₃ and TiO₂ thin films

Flender

Scholz

Klein

et al. 2016

Phys. Chem. Chem. Phys.

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We present an ultrafast UV-Vis-NIR transient absorption study of the donor-acceptor solar-cell dye D49 in diisopropyl ether, THF and acetonitrile, as well as on mesoporous AlO and TiO thin films. Photoexcitation at 505 nm initially populates the first electronically excited state of the dye having significant intramolecular charge transfer character ("S/ICT"). On AlO and in the three organic solvents, the dynamics are fully explained in terms of S/ICT stabilisation (by reorientation of adjacent solvent or D49 molecules and collisional cooling), intramolecular vibrational redistribution and S/ICT → S electronic decay. A substantial decrease of the S/ICT lifetime is observed with increasing polarity of the surrounding medium suggesting an acceleration of internal conversion. In agreement with these results, the addition of the nonpolar co-adsorbent deoxycholic acid (DCA) to the AlO surface leads to a substantial increase of the S/ICT lifetime. DCA spacers reduce the local polarity around the dye molecules, thus interrupting D49 "self-solvation". These results are in contrast to a recent experimental study for the indoline dye D131 on AlO, where charge transfer from electronically excited D131 to adjacent dye molecules was proposed (Cappel et al., Sci. Rep., 2016, 6, 21276). We do not see evidence for charge transfer processes between D49 molecules and also not for electron injection from D49 into AlO trap states. Charge separation is only observed for D49 bound to TiO thin films, with efficient injection of electrons into the conduction band of the semiconductor via formation of a [D49˙e] complex and a transient Stark effect signalling the formation of mobile electrons upon dissociation of the complex.

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Section: Discussionmentioning

confidence: 99%

Section: Pump -Supercontinuum Probe (Pscp) Spectroscopymentioning

confidence: 99%

Excited-state relaxation of the solar cell dye D49 in organic solvents and on mesoporous Al₂O₃ and TiO₂ thin films

Flender

Scholz

Klein

et al. 2016

Phys. Chem. Chem. Phys.

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“…3. Broad bands at ≈410 nm, ≈430 nm and ≈470 nm are visible in all spectra and may be associated, respectively, with resonance Raman bands from all- trans -retinal species [25], and with fluorescence recombination from 1 Bu+ and 1 Ag-(ππ*) singlet excited manifolds states [26–27]. …”

Section: Resultsmentioning

confidence: 99%

Electro-optical interfacial effects on a graphene/π-conjugated organic semiconductor hybrid system

Araujo¹,

Cury²,

Matos³

et al. 2018

Beilstein J. Nanotechnol.

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The influence of graphene and retinoic acid (RA) – a π-conjugated organic semiconductor – interface on their hybrid system is investigated. The physical properties of the interface are assessed via scanning probe microscopy, optical spectroscopy (photoluminescence and Raman) and ab initio calculations. The graphene/RA interaction induces the formation of a well-organized π-conjugated self-assembled monolayer (SAM) at the interface. Such structural organization leads to the high optical emission efficiency of the RA SAM, even at room temperature. Additionally, photo-assisted electrical force microscopy, photo-assisted scanning Kelvin probe microscopy and Raman spectroscopy indicate a RA-induced graphene doping and photo-charge generation. Finally, the optical excitation of the RA monolayer generates surface potential changes on the hybrid system. In summary, interface-induced organized structures atop 2D materials may have an important impact on both design and operation of π-conjugated nanomaterial-based hybrid systems.

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“…For geometry optimization, DFT was used with B3LYP functional and 6‐31G(d) basis set. The energies of the six lowest excited states were computed with TDDFT using CAM‐B3LYP functional and 6‐31+G(d) basis set, which have been shown to give results close to experiments 3 …”

Section: Chartmentioning

confidence: 88%

Tuning of Absorption Wavelength of Retinal Studied by Time‐Dependent Density Functional Theory

Lee

2021

Bulletin Korean Chem Soc

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Retinal bound to protein is a chromophore whose absorption wavelength changes considerably depending on the protein environment. It is the key component for animal vision and plays an important role in converting light to metabolic energy in certain microorganisms. In the present study, we used time‐dependent density functional theory to compute the absorption wavelength of all‐trans‐retinal in the form of protonated Schiff base under various conditions and show that electrostatic interactions are important in color‐tuning, while structural change also affects the absorption wavelength to some extent.

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A comprehensive picture of the ultrafast excited-state dynamics of retinal

Cited by 12 publications

References 52 publications

Excited-state relaxation of the solar cell dye D49 in organic solvents and on mesoporous Al₂O₃ and TiO₂ thin films

Excited-state relaxation of the solar cell dye D49 in organic solvents and on mesoporous Al₂O₃ and TiO₂ thin films

Electro-optical interfacial effects on a graphene/π-conjugated organic semiconductor hybrid system

Tuning of Absorption Wavelength of Retinal Studied by Time‐Dependent Density Functional Theory

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A comprehensive picture of the ultrafast excited-state dynamics of retinal

Cited by 12 publications

References 52 publications

Excited-state relaxation of the solar cell dye D49 in organic solvents and on mesoporous Al2O3 and TiO2 thin films

Excited-state relaxation of the solar cell dye D49 in organic solvents and on mesoporous Al2O3 and TiO2 thin films

Electro-optical interfacial effects on a graphene/π-conjugated organic semiconductor hybrid system

Tuning of Absorption Wavelength of Retinal Studied by Time‐Dependent Density Functional Theory

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Excited-state relaxation of the solar cell dye D49 in organic solvents and on mesoporous Al₂O₃ and TiO₂ thin films

Excited-state relaxation of the solar cell dye D49 in organic solvents and on mesoporous Al₂O₃ and TiO₂ thin films