New isothiocyanato liquid crystals containing thieno[3,2-<i>b</i>]thiophene central core

Yang, Xiaozhe; Mo, Lingchao; Hu, Minggang; Li, Jian; Li, Juanli; Chen, Ran

doi:10.1080/02678292.2018.1435828

Cited by 20 publications

(5 citation statements)

References 42 publications

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“…The compounds with a nematic phase in a broad temperature range showed a high birefringence value (> 0.4). Similar values have been also shown based on thieno[3,2-b]thiophene-based compounds 17 , thieno[3,2-b]thiophene with a – C C – triple bond (0.40–0.48) 18 , and benzoxazole-terminated mesogenic compounds with fluoro substituent at different positions (0.45) 19 . Higher values (0.66) have also been demonstrated in LC compounds with isothiocyanate and naphthyl groups.…”

Section: Introductionsupporting

confidence: 82%

A high birefringence liquid crystal for lenses with large aperture

Bennis

Jankowski

Strzeżysz

et al. 2022

Sci Rep

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This work presents the application of an experimental nematic liquid crystal (LC) mixture (1929) in a large aperture lens. The LC material is composed of terphenyl and biphenyl derivatives compounds with an isothiocyanate terminal group and fluorinated lateral substituents. The substitution with a strongly polar isothiocyanate group and an aromatic rigid core provides $$\pi$$ π -electron coupling, providing high birefringence ($$\Delta n = 0.3375$$ Δ n = 0.3375 at 636 nm and 23 °C) and low viscosity ($$\eta$$ η = 17.03 mPa s). In addition, it also shows high values of birefringence at near infrared (0.318 at 1550 nm). The synthesis process is simple when comparing materials with high melting temperatures. The excellent properties of this LC mixture are demonstrated in a large aperture LC-tunable lens based on a transmission electrode structure. Thanks to the particular characteristics of this mixture, the optical power is high. The high birefringence makes this LC of specific interest for lenses and optical phase modulators and devices, both in the visible and infrared regions.

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Section: Introductionsupporting

confidence: 82%

A high birefringence liquid crystal for lenses with large aperture

Bennis

Jankowski

Strzeżysz

et al. 2022

Sci Rep

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“…In order to improve the birefringence of liquid crystals, we introduced thieno[3,2-b]thiophene with 10 π electrons into the molecular skeleton, and obtained NCS liquid crystals with biaryl ring structure, and the birefringence is close to 0.40 [24]. However, this kind of liquid crystals have high melting points and mainly presents smectic phase.…”

Section: Ncs Liquid Crystal Compounds Containing Thieno [32-b]thiophe...mentioning

confidence: 99%

P‐12.12: Development and Application of High Birefringence Liquid Crystal Materials

Li¹,

Li²,

Hu³

et al. 2023

Symp Digest of Tech Papers

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The development of new liquid crystal optoelectronic devices, including laser phase modulation, microwave and terahertz devices, requires liquid crystal materials with high birefringence. In this paper, three new molecular design strategies are proposed, including the introduction of olefin chain, lateral fluorine substitution and new ring core. Four new series of isothiocyanate liquid crystal compounds with high birefringence, low melting point and wide nematic temperature range were synthesized. Based on these new liquid crystal compounds, a liquid crystal mixture with nematic temperature range of ‐40~146 ºC and birefringence of 0.42 was developed. At 19 GHz, the new liquid crystal mixture shows excellent dielectric properties, with dielectric anisotropy of 1.28 and dielectric loss of 0.0087. The new liquid crystal mixture also has very low viscoelastic coefficient. The results at 1550nm and 60 ºC show that the response speed can reach 3.6 milliseconds with 2π phase modulation in the reflection mode.

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“…Regarding electrical properties, the CMOS circuitry limits the operation voltage to <6 V for small-pitch panels. Such a low voltage can be achieved by increasing the dielectric anisotropy of LC materials, which could be obtained by applying lateral and terminal polar groups (such as F, CN, NCS, CF 3 or OCF 3 ) [37][38][39], polar CF 2 O bridges [40], and polar heterocycles [41,42]. However, these components often lead to a compromised nematic temperature range, lower solubility and higher viscosity γ 1 [38].…”

Section: Lc Materials Optimization Strategiesmentioning

confidence: 99%

Liquid-Crystal-on-Silicon for Augmented Reality Displays

Huang

Liao²,

Chen

et al. 2018

Applied Sciences

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In this paper, we review liquid-crystal-on-silicon (LCoS) technology and focus on its new application in emerging augmented reality (AR) displays. In the first part, the LCoS working principles of three commonly adopted LC modes—vertical alignment and twist nematic for amplitude modulation, and homogeneous alignment for phase modulation—are introduced and their pros and cons evaluated. In the second part, the fringing field effect is analyzed, and a novel pretilt angle patterning method for suppressing the effect is presented. Moreover, we illustrate how to integrate the LCoS panel in an AR display system. Both currently available intensity modulators and under-developing holographic displays are covered, with special emphases on achieving high image quality, such as a fast response time and high-resolution. The rapidly increasing application of LCoS in AR head-mounted displays and head-up displays is foreseeable.

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New isothiocyanato liquid crystals containing thieno[3,2-b]thiophene central core

Cited by 20 publications

References 42 publications

A high birefringence liquid crystal for lenses with large aperture

A high birefringence liquid crystal for lenses with large aperture

P‐12.12: Development and Application of High Birefringence Liquid Crystal Materials

Liquid-Crystal-on-Silicon for Augmented Reality Displays

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