High birefringence liquid crystals with a wide temperature range and low melting point for augmented reality displays

Chen, Ran; Zhao, Ling; Li, Yannanqi; Li, Jian; Chen, Pei; Chen, Xinbing

doi:10.1039/d3ma00042g

Cited by 4 publications

(1 citation statement)

References 51 publications

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“…This indicates n e (T) being smaller in NLC-i than in the other NLCs studied. The higher birefringence in NLC-ii, NLC-iii, and NLC-iv compared to NLC-i is due to the presence of more polar functional groups in the former which is important in LCD applications [49].…”

Section: Resultsmentioning

confidence: 99%

Temperature-dependent characterization of optical parameters in novel high birefringence nematic liquid crystal mixtures: an empirical investigation

Farezi,

Khoshsima,

Zakerhamidi

et al. 2024

Phys. Scr.

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AbstractThis study investigates the temperature-dependent behaviors of three novel high-birefringence (Δn) nematic liquid crystals (NLCs) with varying clearing temperatures (TNI). The high birefringence of the studied novel nematic liquid crystals is advantageous for LCD applications. It ensures fast response times, wide viewing angles, enhanced color reproduction, and reduced cross-talk, optimizing display performance and image quality. The goal is to characterize their order parameters (S(T)), effective geometry parameters (αeg), normalized polarizabilities, and crossover temperatures (Tco). Utilizing a modified four-parameter model for temperature-dependent refractive indices, we extract adjustable parameters and analyze their impact on Tco and S(T). Three approaches, including the Vuks model, Haller approximation model, and an effective geometry parameter-based model, are employed to assess S(T). The study focuses on four unknown parameters (A, B, (Δn)0, and β) derived from the modified model, along with the nematic-isotropic transition temperature (TNI). Findings reveal that a higher absolute value for the B parameter, a smaller β parameter value, elevated TNI values, and increased (Δn)0 values enhance the Tco value.

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Section: Resultsmentioning

confidence: 99%

Temperature-dependent characterization of optical parameters in novel high birefringence nematic liquid crystal mixtures: an empirical investigation

Farezi,

Khoshsima,

Zakerhamidi

et al. 2024

Phys. Scr.

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Utilizing bicyclohexene as a building block: A promising approach to achieve negative liquid crystals with lower melting points

Wan,

Mo,

Che

et al. 2025

Journal of Molecular Structure

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New self-organised benzo[b]thiophene-based materials for GHz applications

Mieczkowska,

Herman,

Rychłowicz

et al. 2024

Liquid Crystals

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The solution of 6-bromobenzothiophene (10.00g -0.047mol) 1, 2-(4pentylphenyl)-1,3,2-dioxaborate (10.19g -0.049mol) 2, anhydrous caesium carbonate Cs 2 CO 3 (53.60 g -0.16 mol), acetone (250cm 3 ) and water (100cm 3 ) were added to a flask and stirred under an N 2 atmosphere and heated up to the boiling temperature and kept under this conditions for 10 minutes. Then it was cooled slowly to 35 o C and palladium(II) acetate (0.1%mol) with XPhos (0.05%mol) was added. Next, mixture was stirred under reflux for 2h. When the reaction was finished acetone was evaporated and obtained mixture was filtered under reduced pressure and washed by 100cm 3 of toluene. Crude product was extracted with toluene. Organic layer was washed two times with water, separated, dried over magnesium sulfate MgSO4 and solvent evaporated. Solid product was purified by column chromatography on silica gel using hexane as eluent and crystallized from anhydrous ethanol. Yield: 10,55g (80,16%). 2-iodo-6-(4-pentylphenyl)benzothiophene 4Anhydrous tetrahydrofuran THF (500cm 3 ) and diisopropylamine (19.88 cm 3 -0.14mol) were introduced into a flask and stirred under an N 2 atmosphere. The reaction mixture was cooled to -78 o C in a dry iceacetone bath. Then n-Butyllithium (56cm 3 -2.50mol/dm 3 ) was added dropwise (temperature of reaction mixture increased by 8°C), followed by 6-(4pentylphenyl)benzothiophene (26.40g -0.094mol) dissolved in anhydrous THF (30cm 3 ). After 10 minutes, iodine (35.56g -0.14mol) dissolved in 100cm 3 of anhydrous THF was added dropwise to the reaction mixture (temperature of reaction mixture increased by 7°C). Thirty minutes after the addition was complete, the cooling bath was removed to allow the solution to reach room temperature. Sodium sulfite was added to the mixture for discoloration. Everything was transferred to a separatory funnel. Organic layer separated and solvent evaporated. Crude product was extracted with dichloromethane Organic layer was washed two times with water, separated, dried over magnesium sulfate MgSO4 and solvent evaporated Solid product was crystallized from ethanol.

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High birefringence liquid crystals with a wide temperature range and low melting point for augmented reality displays

Abstract: A series of tolane-liquid crystals terminated by buty-3-enyl with high performance (such as a high clearing point, low melting point, high birefringence ∆n, low viscosity γ1, and broaden nematic phase...

Cited by 4 publications

References 51 publications

Temperature-dependent characterization of optical parameters in novel high birefringence nematic liquid crystal mixtures: an empirical investigation

Temperature-dependent characterization of optical parameters in novel high birefringence nematic liquid crystal mixtures: an empirical investigation

Utilizing bicyclohexene as a building block: A promising approach to achieve negative liquid crystals with lower melting points

New self-organised benzo[b]thiophene-based materials for GHz applications

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