Effect of dye structure on orientational behavior and transition dipole moments in coatable guest–host polarizers

Chang, Jae Bok; Namgoong, Jin Woong; Kim, Se Hun; Park, Sang Hyoung; Hwang, Byoung Har; Kim, Jae Pil

doi:10.1016/j.dyepig.2015.05.007

Cited by 14 publications

(17 citation statements)

References 37 publications

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“…Crystals 2021, 11, x FOR PEER REVIEW 2 of 14 order parameters than the nematic RM molecules, the homeotropic orientation at the air interface limits their application in the coatable polarizer and in the retarder film [16][17][18].…”

Section: Methodsmentioning

confidence: 99%

“…Consequently, it is difficult to fabricate a RM retarder film with a uniform orientation of the RM molecules without defects. In particular, the smectic RM molecules that are used for the coatable polarizer often represent a homeotropic orientation at the air interface [16][17][18]. Although the smectic RM molecules show greater order parameters than the nematic RM molecules, the homeotropic orientation at the air interface limits their application in the coatable polarizer and in the retarder film [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Planar Orientation of Reactive Mesogen Molecules for Optical Retarder Film by Anisotropic Surface Plasma Treatment

Kim

Lee

2021

Crystals

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We proposed a method for enhancing the planar orientation of reactive mesogen (RM) molecules by means of anisotropic plasma treatment. Anisotropic surface plasma, of which energy density is dependent on the azimuthal angle, was generated by column-shaped ceramic electrodes. The anisotropic plasma was discharged on the surface of a polyvinyl alcohol (PVA) alignment layer before the rubbing process began. The contact angle of the surface was increased from 12° to 83° after plasma treatment, indicating a hydrophobic property of the surface. From the atomic force microscopy (AFM) measurement, it was found that the grain size of the PVA layer was reduced and that the grooved patterns were formed provided that the plasma direction was parallel to the rubbing direction of the surface. Consequently, the planar orientation was enhanced, and the in-plane retardation of the photo-polymerized RM films increased when the parallel plasma was treated on the surface.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of Planar Orientation of Reactive Mesogen Molecules for Optical Retarder Film by Anisotropic Surface Plasma Treatment

Kim

Lee

2021

Crystals

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“…14 This host− guest system of LC−dichroic dyes is the most efficient for absorbing incident light as the direction of incident linear polarized light (LPL) and absorption axes of the dye molecule are parallel 6,14,15 and thus useful in various applications such as smart light-responsive polymer, 16 windows, 17 laser protection, 18 lenses, 19 and linear polarizers. 3−6 However, dichroic dye-doped LC films have been used for only limited applications with "on and off" functions because almost the dichroic dyes have only one absorption axis, [3][4][5][6]14,17 except for molecules with some complex electron distributions. 15,20 In this study, a bilayer dichroic dye-doped LC (BDLC) film was fabricated for multiplex applications.…”

Section: ■ Introductionmentioning

confidence: 99%

Fabrication of Bilayer Dichroic Films Using Liquid Crystal Materials for Multiplex Applications

Park

Choi

Yun

et al. 2020

ACS Appl. Mater. Interfaces

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A bilayer dichroic-doped liquid crystal (BDLC) film is fabricated via the uniaxial alignment method and a photopolymerization process. It is found to be useful in dichroic color filters, dual-mode circular polarizers, and chirality detectors. Two kinds of dichroic films with different absorbing wavelengths are cross-stacked to show various colors and contrasts depending on the polarization direction of the incident linearly polarized light, which is comparable with the conventional single-layer dichroic dye-doped (SDLC) film that only shows the contrast difference. This platform can be used in many other applications beyond the applications presented in this study, such as multicolor holograms, optical signal encryption, and electrically tunable devices.

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“…В работе [4] было показано, что дипольный момент оптического перехода в молекулах DO3 максимален в направлении главной оси молекулы. Вероятность поглоще- When illuminating films of azo polymers with linear polarized laser radiation, chromophore fragments orientation occurs.…”

Section: Introductionunclassified

“…The paper [4] demonstrated that the dipolar moment of optical transition μ mn in DO3 molecules is maximal in the direction of the molecule principal axis. The probability of absorption by the molecule of radiation is maximal when the direction of its principal axis matches the direction of polarization of the incident field.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Azo Polymers Local Mobility by Oscillatory Spectra of Chromophores

Shuhina¹,

Фишман²,

Harintsev³

2017

FRos

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Effect of dye structure on orientational behavior and transition dipole moments in coatable guest–host polarizers

Cited by 14 publications

References 37 publications

Enhancement of Planar Orientation of Reactive Mesogen Molecules for Optical Retarder Film by Anisotropic Surface Plasma Treatment

Enhancement of Planar Orientation of Reactive Mesogen Molecules for Optical Retarder Film by Anisotropic Surface Plasma Treatment

Fabrication of Bilayer Dichroic Films Using Liquid Crystal Materials for Multiplex Applications

Investigation of Azo Polymers Local Mobility by Oscillatory Spectra of Chromophores

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