Droplet configuration control with orange azo dichroic dye in polymer dispersed liquid crystal for advanced electro-optic characteristics

Sharma, Vandna; Kumar, Pankaj; Sharma, Amit; Chinky,; Raina, K. K.

doi:10.1016/j.molliq.2017.03.012

Cited by 47 publications

(12 citation statements)

References 49 publications

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“…Moreover, the contrast ratio of the [7:3]-PDLCs NBA107 is ~9. Accordingly, the [7:3]-PDLCs NBA107 with low power consumption has considerable potential to be applied in the various areas of optics [1,2,3,4,5,6,7,8,9,10,11,12]. The scattering performances of the PSMLS mainly driven by in-plane and/or vertical fields with low V th were also demonstrated.…”

Section: Discussionmentioning

confidence: 99%

“…Optical devices based on polymer-dispersed liquid crystals (PDLCs) have been studied worldwide for several decades because of their electrically switchable light-scattering properties [1,2]. PDLCs can be applied to light shutters, 2D/3D switching, displays, holographic gratings, optical retardations, and so forth [1,2,3,4,5,6,7,8,9,10,11,12]. Polymers and liquid crystals (LCs) with a proper weight ratio are initially well-mixed with each other, and LC droplets can be formed in a continuous polymer matrix through polymerization-induced phase separation (PIPS) after treatment with UV illumination for a certain duration [1,2].…”

Section: Introductionmentioning

confidence: 99%

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Low-Threshold-Voltage and Electrically Switchable Polarization-Selective Scattering Mode Liquid Crystal Light Shutters

Liang

Yang

et al. 2018

Polymers

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Low-threshold-voltage (Vth) and electrically switchable, polarization-selective scattering mode light shutters (PSMLSs) using polymer-dispersed liquid crystals (PDLCs) are demonstrated in this work. The optimized weight ratio of the nematic liquid crystals (LCs) to the adopted monomer (NBA107, Norland Optics) in the low-Vth PDLCs based on NBA107 is 7:3, [7:3]-PDLCsNBA107. The properties of the low-Vth PDLCsNBA107, such as light-scattering performance, initial transmission, Vth, and droplet size were investigated. Experiment results show that the surface anchoring (threshold-voltage) of NBA107 is weaker (lower) than or equal to that of the common NOA65. The cost is that the response time of the proposed PDLCsNBA107 is relatively long. A method to reduce the decay time, which can be applied to all other PDLC devices, will be elucidated. In addition to the low Vth of the proposed PDLCsNBA107, the operation voltage (~6 Vrms) to approach the maximum transmission is relatively low in a 7 μm-thick PDLCsNBA107 cell. Moreover, the polarization-selective light-scattering performances of the proposed PSMLSs based on the [7:3]-PDLCsNBA107, mainly driven by in-plane and vertical fields, are also demonstrated.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-Threshold-Voltage and Electrically Switchable Polarization-Selective Scattering Mode Liquid Crystal Light Shutters

Liang

Yang

et al. 2018

Polymers

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“…Analytical formulas (7)- (14) and (16) for the structure factors can be used for monolayers with filling factors up to ~0.7 [33,37].…”

Section: Optical Model To Describe Small-angle Light Scattering Bmentioning

confidence: 99%

“…On the basis of these films it is possible to create: displays, intensity and phase modulators, polarizers and polarization converters, lenses, filters, reflectors, etc. [3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Model to describe light scattering by polymer film containing droplets with inhomogeneous anchoring of liquid crystal molecules at the polymer–droplet interface: asymmetry effect in the angular distribution of light

et al. 2019

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A model to describe light scattering by polymer film containing of monolayer of liquid crystal droplets with inhomogeneous anchoring of liquid crystal molecules at the polymerdroplet interface is developed. It is based on the interference approximation of the wave scattering theory. The director field distribution in the droplet volume is determined by solving the free energy density minimization problem using the relaxation method. The spatial distribution of droplets in the layer is described by the hard disks model. The amplitude scattering matrices of individual droplets are found in the anomalous diffraction approximation. The algorithm for numerical analysis of the characteristics of light scattered in a polymer film containing droplets at homogeneous and inhomogeneous surface anchoring is described in terms of the partial filling factors of the monolayer film. Electrically controllable symmetry breaking effect of angular distribution of light scattered by films containing droplets with inhomogeneous anchoring at the polymer-droplet interface is described and experimentally confirmed.

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“…In our recent reported work, the dopants such as carbon nanotube, azo and anthra dyes are employed to enhance the EO properties of normal mode PDLCs . These dyes have good optical and alignment properties as well as high solubility in LC hosts, which resulted in LC devices of higher CRs with reduced applied fields.…”

Section: Introductionmentioning

confidence: 99%

Preparation and electrooptic study of reverse mode polymer dispersed liquid crystal: Performance augmentation with the doping of nanoparticles and dichroic dye

Sharma

Kumar

Chinky

et al. 2019

J of Applied Polymer Sci

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Reported herein, the preparation, morphological, and electrooptic (EO) characterization of reverse mode polymer dispersed liquid crystals (PDLCs) with nematic liquid crystal (LC) and UV curable polymer optical adhesive using polymerization induced phase separation method. The PDLCs are switchable between transparent and opaque states due to the homeotropic and planar alignment of LC in their OFF and ON states of applied voltage, respectively. Further, effect of doping of a fixed concentration of azo dye and silica nanoparticles (NPs) on morphological, EO and response characteristics of same PDLC sample was also analyzed. Experimental results showed that doped reverse mode PDLCs have the higher OFF state optical transmission and boost up in the scattering ON state compared with pristine reverse mode PDLC. The phenomenon is also supported by extinction coefficient and absorption study based on Beer's law. The threshold and operating voltages were found reduced ~1.56 and ~1.73 times for NPs and (NPs + dye) doped reverse mode PDLCs, respectively, along with better contrasts to the pristine reverse mode PDLC. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48745.

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Droplet configuration control with orange azo dichroic dye in polymer dispersed liquid crystal for advanced electro-optic characteristics

Cited by 47 publications

References 49 publications

Low-Threshold-Voltage and Electrically Switchable Polarization-Selective Scattering Mode Liquid Crystal Light Shutters

Low-Threshold-Voltage and Electrically Switchable Polarization-Selective Scattering Mode Liquid Crystal Light Shutters

Model to describe light scattering by polymer film containing droplets with inhomogeneous anchoring of liquid crystal molecules at the polymer–droplet interface: asymmetry effect in the angular distribution of light

Preparation and electrooptic study of reverse mode polymer dispersed liquid crystal: Performance augmentation with the doping of nanoparticles and dichroic dye

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