A large Kerr constant polymer-stabilized blue phase liquid crystal

Rao, Linghui; Yan, Jin; Wu, Shin‐Tson; Yamamoto, Shinichi; Haseba, Yashuhiro

doi:10.1063/1.3559614

Cited by 204 publications

(147 citation statements)

References 20 publications

(16 reference statements)

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“…6. In the low-frequency region where f < 2 kHz, the coefficient K kerr is constant and its value K kerr = 27 nm/V 2 is about two orders of magnitude greater than the Kerr constant of nitrobenzene and twice larger than the Kerr constant of the best known PSBPLC [41].…”

Section: -5mentioning

confidence: 99%

Orientational Kerr effect and phase modulation of light in deformed-helix ferroelectric liquid crystals with subwavelength pitch

et al. 2013

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We study both theoretically and experimentally the electro-optical properties of vertically aligned deformed helix ferroelectric liquid crystals (VADHFLC) with subwavelength pitch that are governed by the electrically induced optical biaxiality of the smectic helical structure. The key theoretical result is that the principal refractive indices of homogenized VADHFLC cells exhibit the quadratic nonlinearity and such behavior might be interpreted as an orientational Kerr effect caused by the electric-field-induced orientational distortions of the FLC helix. In our experiments, it has been observed that, for sufficiently weak electric fields, the magnitude of biaxiality is proportional to the square of electric field in good agreement with our theoretical results for the effective dielectric tensor of VADHFLCs. Under certain conditions, the 2π phase modulation of light, which is caused by one of the induced refractive indices, is observed without changes in ellipticity of incident light.

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confidence: 99%

Orientational Kerr effect and phase modulation of light in deformed-helix ferroelectric liquid crystals with subwavelength pitch

et al. 2013

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“…This probably is the reason that the commercial production of the LCD based on BPs is not foreseen. An overview of the recent developments of this new technology, readers can find in the following references [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties and molecular motions of liquid crystal molecules in 4-(2-methylbytyl)phenyl 4-(4-octylphenyl)benzoate liquid crystal having blue phase (CE8)

Otowski

Lewińska

2015

Materials Science-Poland

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Blue phase liquid crystals exhibit unique properties which are used in the new type of display. A blue-phase liquid crystal display was first presented commercially by Samsung in 2007. The blue-phase-three-color pixel display eliminates the need for color filters. This type of display uses blue-phase multi-component liquid crystal. Considering the one-component systems, it turns out that they are stable only in a very narrow range of temperatures between the isotropic and the chiral nematic phase (about 1 K). In 2005, a wide temperature range BP multi-component system was reported by researchers from the University of Cambridge. There are still several unsolved problems left. One of them is chemical stability and reliability. Therefore, the knowledge of molecular dynamics of blue phase liquid crystal is a prerequisite for understanding of blue-phase multi-component system. Understanding the molecular dynamics of a single component liquid-crystalline blue phase system can facilitate the solution of these problems. We present the molecular dynamics investigation of 4-(2-methylbytyl)phenyl 4-(4-octylphenyl)benzoate (CE8), which may be a good candidate to form materials suitable for blue-phase liquid crystal displays.

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“…After this strategy was established, especially after Samsung exhibited the first BP LC display (LCD) at SID Display Week in Los Angeles, in 2008, more and more attentions had been attracted by the promising materials. Wu's group [12] has made great contributions to the improvement of PSBP materials, e.g., they reported a kind of PSBP material with a large Kerr constant of 13.7 nm/V 2 , which is 3∼10 times higher than the conventional BPLCs. A kind of high dielectric constant (Δε ∼94) nematic LCs was selected to prepare such PSBP, and low drive voltage (RMS) of 48 V, high contrast ratio of 1000:1 for the PSBP was obtained.…”

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confidence: 99%

“…A kind of high dielectric constant (Δε ∼94) nematic LCs was selected to prepare such PSBP, and low drive voltage (RMS) of 48 V, high contrast ratio of 1000:1 for the PSBP was obtained. And they also pointed out that the drive voltage could even reduce to less than 10 V, if using the protrusion electrode cell [12,13] . This is undoubtedly a major breakthrough for the applications of PSBP on thin film transistor (TFT)-LCD.…”

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Brief review of recent research on blue phase liquid crystal materials and devices

Zheng¹,

Zhu²,

Sun³

et al. 2013

中国光学快报

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Both polymer stabilization and bent-shaped molecule doping strategies are utilized to widen the blue phase range of liquid crystals. The molecular structures of compositions are optimized for high thermooptical and electro-optical performances. A low temperature applicable blue phase liquid crystal with suppressed hysteresis is achieved. The bistability of one blue phase liquid crystal is investigated. Based on these materials, fast tunable devices such as gratings with polarization insensitivity are designed and fabricated. The materials and device designs demonstrated here are suitable in wide applications requiring fast response time.OCIS codes: 160.3710, 050.1950, 160.4670. doi: 10.3788/COL201311.011601. It is well known that the nematic, smectic, and cholesteric are three typical phases of the conventional liquid crystals (LCs). The blue phase (BP) is also a special LC phase which normally exists in the materials with large twisted power. When such material is cooled down, many colorful platelet textures can be found in a very narrow temperature range (1-2 K) between the isotropy and chiral nematic phases, that is the BP [1] . Many theoretical analysis and experimental phenomenon have revealed that LC alignment in BP is complex and exotic. Not like the single twisted assembling in cholesteric phase, LC molecules are double twisted assembled in BP. The two twisted axes are crossed with each other and form the double twisted cylinders (DTCs). These DTCs can either exist in disordered distribution, exhibiting a fog-like texture (BP III), or self-assemble into three-dimensional (3D) crystals, showing colorful platelet textures (BP I and BP II) due to the selective Bragg reflections [2,3] . The unique structure of BP LC endows it with some interesting characteristics, such as optical isotropy at voltage off state, fast response time down to submillisecond, which are much benefit for the next generation of display and photonic devices [4−10] . Although BP LC was found a century ago, it was failed to be applied realistically for quite a long time due to its instinct problems, especially its narrow temperature range. Many efforts have been made to overcome this shortage. Some great improvements have been achieved during the last decade. The first promising wide temperature range BP was demonstrated by Kikuchi et al. [11] . They uniformly mixed acrylate based monomers into chiral nematic LCs, and then exposed the mixture under UV at BP state to polymerize the monomers. Finally, the BP was stabilized by polymer network, and the BP range was extended to over 60 • C. This is the so called polymer stabilized BP (PSBP). The mechanism of PSBP is that the polymer forms a stable 3D framework and stabilizes the defects in the frustration BP system. After this strategy was established, especially after Samsung exhibited the first BP LC display (LCD) at SID Display Week in Los Angeles, in 2008, more and more attentions had been attracted by the promising materials. Wu's group [12] has made great contributions to the impro...

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A large Kerr constant polymer-stabilized blue phase liquid crystal

Cited by 204 publications

References 20 publications

Orientational Kerr effect and phase modulation of light in deformed-helix ferroelectric liquid crystals with subwavelength pitch

Orientational Kerr effect and phase modulation of light in deformed-helix ferroelectric liquid crystals with subwavelength pitch

Dielectric properties and molecular motions of liquid crystal molecules in 4-(2-methylbytyl)phenyl 4-(4-octylphenyl)benzoate liquid crystal having blue phase (CE8)

Brief review of recent research on blue phase liquid crystal materials and devices

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