Photoinduced phenomena in corona poled polar organic films

Muzikante, I.; Fonavs, E.; Brehmer, L.; Stiller, Burkhard

doi:10.1016/j.cis.2005.06.006

Cited by 6 publications

(5 citation statements)

References 23 publications

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“…This lack of uniformity and long-range order gives rise to larger and irregular flattened structures, leading to a significant increase of the rms roughness:~39.3 Å. According to the literature [10,31], these features exemplify the structural film evolution triggered by the electrical poling performed at high temperatures and permanent thermal processes. Because of this, the polar molecules or functional groups may be displaced within the film layer, leading to a surface reordering as the interacting dipoles tend to orient in opposite directions, but the electric field forces them to align along its direction.…”

Section: Morphological and Spectroscopic Film Characterizationsmentioning

confidence: 95%

“…This molecular design is commonly implemented for obtaining functionalized polymers suitable for second-order SHG/NLO-applications. Here, due to the push-pull effect induced upon photoexcitation (via the driving force of the laser electric field and the donor-acceptor functional groups), a modification in the charge distribution is forced; thus, this results in an intramolecular charge transfer and the subsequent NLO-response [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, a strict requirement for inducing quadratic NLO-effects in organic materials relies on the arrangement being non-centrosymmetric. On a molecular level, being non-centrosymmetric is quite easy to achieve by connecting strong electron donors and acceptors by a conjugated π-bridge, yielding strong dipolar molecules [10].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quadratic Non-Linear Optical Properties of the poly(2,5-bis(but-2-ynyloxy) Benzoate Containing the 2-(ethyl(4-((4-nitrophenyl)buta-1,3-diynyl)phenyl)amino)ethanol) Chromophore

et al. 2020

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Excellent quadratic non-linear optical (ONL-2) properties of the poly(2,5-bis(but-2-ynyloxy) benzoate, containing a polar diacetylene as a chromophore, were found. According with the Maker fringes method, oriented polymer films showing an order parameter of ∼0.23 can display outstanding and stable Second Harmonic Generation (SHG) effects under off-resonant conditions (SHG-532 nm). Also, the macroscopic non-linear optical (NLO)-coefficients were evaluated under the rod-like molecular approximation, obtaining: χzzz(2) and χzxx(2) in the order of 280 ± 10 and 100 ± 10 pm V−1, respectively. The mechanical and chemical properties, in addition to the large ONL-2 coefficients exhibited by this polymer, make it a promising organic material in the development of optoelectronic/photonic devices.

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Section: Morphological and Spectroscopic Film Characterizationsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Quadratic Non-Linear Optical Properties of the poly(2,5-bis(but-2-ynyloxy) Benzoate Containing the 2-(ethyl(4-((4-nitrophenyl)buta-1,3-diynyl)phenyl)amino)ethanol) Chromophore

et al. 2020

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“…To study the electrical properties of polar molecules a method based on measuring the surface potential of a polymer film was used. The method provides useful information on the structural and electronic properties of the oriented films [5]. The surface potential is the difference of the potentials between the organic film and the gaseous phase upon this film.…”

Section: Molecules Under Considerationmentioning

confidence: 99%

Photoisomerization Processes of Azobenzene Compounds in Thin Poymer Films

Niparte¹,

Muzikante²,

Fonavs³

et al. 2010

Latvian Journal of Physics and Technical Sciences

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One of the most important properties of the molecular switches is turning of a molecule by external action, e.g. by irradiation with light of definite wavelength. The molecules of promise for the molecular switches are those with azobenzene moiety. When azobenzene is irradiated with light of definite wavelength, it is possible to observe the process of trans/cis isomerisation. In this work, the influence of photoisomerisation processes on the changes in the surface potential of a novel azobenzene compound is investigated.We have studied the surface potential of a PMMA polymer film with polar azobenzene derivative of different concentrations. To orient azobenzene molecules in the film the corona poling method was used, and for studying the surface potential variations -the Kelvin probe method. The photoreaction time constant of the fast response (several seconds) was found to be almost independent of the molecular concentration in the polymer film and of the absorbed light intensity in the bulk of a sample. In contrast, the amplitude of photoinduced changes in the surface potential depends both on the concentration of azobenzene molecules and on the absorbed light intensity in bulk of the host-guest polymer film.

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“…Most of these molecules in solvents have low fluorescence quantum yield, which strongly depends on the environment parameters. These properties make ID class molecules attractive for various applications in nonlinear optics as molecules with large dielectric susceptibility, which might be pooled in the electric field [2] or oriented by all optical alignment [3]. Good understanding of the excited state properties and relaxation dynamics is therefore very important for their perspective applications.…”

Section: Introductionmentioning

confidence: 99%