Stable electro-optic response in wide-temperature blue phases realized in chiral asymmetric bent dimers [Invited]

Aya, Satoshi; Zep, Anna; Aihara, Kenji; Ema, Kenji; Pociecha, Damian; Górecka, Ewa; Araoka, Fumito; Ishikawa, Ken; Takezoe, Hideo

doi:10.1364/ome.4.000662

Cited by 19 publications

(14 citation statements)

References 60 publications

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“…Many additional phases (Table ) appear under the influence of an electric field, in particular a tetragonal phase BPX, a two‐dimensional hexagonal phase BPH 2D , and a three‐dimensional hexagonal phase BPH 3D . In addition, there exist various smectic BPs, discotic BPs, BPs made of bent‐core molecules, and lyotropic BP analogues (Table ).…”

Section: The First Hundred Years Of Blue Phase Researchmentioning

confidence: 99%

“…[33][34][35][36] Many additional phases (Table 1) appear under the influence of an electric field, [52][53][54][55][56][57][58][59][60] in particular a tetragonal phase BPX, [49] a two-dimensional hexagonal phase BPH 2D , and a three-dimensional hexagonal phase BPH 3D . [55][56][57][58][59] In addition, there exist various smectic BPs, [60][61][62][63][64][65][66][67][68][69] discotic BPs, [70][71][72] BPs made of bent-core molecules, [73][74][75][76] and lyotropic BP analogues [77] (Table 1).…”

Section: The First Hundred Years Of Blue Phase Researchmentioning

confidence: 99%

“…During the last decade, the temperature range of BP appearance was steadily enhanced from a few tenths of K for pure low molar mass calamitic LCs to more than 50 K in LC composites ( Table 2). An increase of the BP temperature interval can be induced by an unusual temperature dependence of the cholesteric pitch, [86] by non-conventional shapes of the nematic host molecules, such as discotic, [70][71][72] dimer, [87] or bent-core [73][74][75][76] LC molecules, by hydrogen bonding [88] or by adding nanoparticles to a usual LC. [89][90][91][92][93][94] Complete vitrification can be achieved in LCs forming a glass-like state at low temperatures [95] or by in situ polymerization of mesogenic reactive monomers with a high concentration and high cross-linking density of the resulting polymer.…”

Section: Blue Phase Stabilizationmentioning

confidence: 99%

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Polymer‐stabilized blue phases: promising mesophases for a new generation of liquid crystal displays

Nordendorf

Hoischen

Schmidtke

et al. 2014

Polymers for Advanced Techs

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Blue phases—special chiral liquid crystalline mesophases—are promising candidates for electro‐optic devices with improved performance and simplified fabrication. A necessary precondition for possible applications is a significantly enhanced temperature range of their existence, which can be achieved by a cross‐linked polymer network formed by in situ polymerization. Unlike many other mesophases, blue phases are optically isotropic if no voltage is applied. Regarding the transmission of a blue phase cell placed between crossed polarizers, the optical isotropy enables—at least in principle—a perfect dark state, independent of the viewing angle, without the necessity of any alignment layer. The application of an in‐plane electric field induces a strong birefringence (Kerr effect). The effective Kerr constants are much larger than those of isotropic liquids, and the switching times between the dark and the induced bright state are in the submillisecond range. Some basic properties of blue phases, state‐of‐the‐art performance, and remaining challenges of the development of polymer‐stabilized blue phases are reviewed in this article. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: The First Hundred Years Of Blue Phase Researchmentioning

confidence: 99%

Section: The First Hundred Years Of Blue Phase Researchmentioning

confidence: 99%

Section: Blue Phase Stabilizationmentioning

confidence: 99%

See 1 more Smart Citation

Polymer‐stabilized blue phases: promising mesophases for a new generation of liquid crystal displays

Nordendorf

Hoischen

Schmidtke

et al. 2014

Polymers for Advanced Techs

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“…Both Coles' and Takezoe's groups have reported on the observations of BPs ranging up to 40 K in bimesogens (mesogenic dimers) [40,41]. Since the director field of the S = −1/2 disclination represents the splay-bend deformation, coincidentally matching the feature of flexoelectric mesogens in an electric field; and, both bent-core mesogens [42] and bimesogens [43] are highly flexoelectric.…”

Section: Expansion Of Temperature Range Of Bpsmentioning

confidence: 98%

Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

Lin

Chen

2015

Anisotropic Nanomaterials

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Blue phase liquid crystals (BPLCs) have attracted considerable attention in recent years owing to their unique periodic structure and electro-optic properties. Besides the potential applications in the next generation display, BPLC with a cubic lattice structure can be regarded as a self-organized three-dimenstional (3D) photonic crystal that can be applied for photonic devices such as optical filter, optical attenuator, phase modulator, laser source and so on. This chapter will introduce the formation of BPLCs from both theoretical and experimental points of view. The stability and temperature range of BPLCs are also discussed followed by its photonic crystal structure, lattice orientation and phase identification. After a basic overview, this chapter will further introduce the applications of BPLCs, including controllability of photonic band gap with external fields, fast electro-optic Kerr effect, and optical nonlinear effect. This short summary shows that the century old intriguing BPLCs have diverse opportunities to offer in modern photonic materials and devices. Moreover, the current challenges in this area are expected to spark innovative ideas leading toward the design and engineering of new chiral materials that may furnish suitable BPLCs to produce advanced photonic materials that have desirable properties and functions.

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“…10 Azobenzene dimers were also used to be doped into BPLCs to control the reflection wavelength. 15 Oxadiazolebased bent-core liquid crystals were introduced to possess a blue phase with a wide mesophasic range ca. 12 In addition, a novel T-shaped chiral compound possessing a wide BP temperature range was also developed.…”

Section: Introductionmentioning

confidence: 99%

The first blue phase reactive monomers containing a bi-mesogenic core and their side-chain polymers

et al. 2015

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Two novel blue phase (BP) reactive monomers M1 and M2 containing a bi-mesogenic core are first reported by introducing two end-attached acrylic spacers with different lengths. Due to the self-assembly of bi-mesogenic cores with the same side-by-side end-attached acrylate spacers in homopolymers P1 and P2, no blue phase could be induced by homopolymerization of M1 and M2. However, by interrupting the self-assembly of bi-mesogenic cores with different side-by-side spacer lengths of copolymers P12, double-twisted cylinders of BPIII could be further extended by copolymerization of M1 and M2 with different molar ratios. With M1 : M2 = 5 : 5 (molar ratio) in both side-chain copolymers P12(soln:5/5) and P12(photo:5/5) rather than binary mixture M1/M2(5/5), the widest BPIII ranges of 5.3 1C and 3.8 1C could be obtained by solution-and photo-polymerization, respectively.Scheme 1 Synthetic routes of blue phase (BP) side-chain copolymers P12 by BP reactive monomers M1 and M2 with different acrylate spacer lengths.

show abstract

Stable electro-optic response in wide-temperature blue phases realized in chiral asymmetric bent dimers [Invited]

Cited by 19 publications

References 60 publications

Polymer‐stabilized blue phases: promising mesophases for a new generation of liquid crystal displays

Polymer‐stabilized blue phases: promising mesophases for a new generation of liquid crystal displays

Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

The first blue phase reactive monomers containing a bi-mesogenic core and their side-chain polymers

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