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<p>Herein, we examined the effects of alkyl chain length variation on the optical and dielectric characteristics of cholesteric liquid crystals (ChLCs). Nematic liquid crystals with different alkyl chain lengths, 5CB, 7CB, and 8CB, were used with 5 wt% of chiral additive. The 7CB-based ChLC system exhibited an approximately 40% enhancement in permittivity relative to the 5CB counterpart. When the alkyl chain was extended to 8CB, the permittivity dropped by nearly 20% compared with that of the 5CB-based ChLC mixture. The electro-optical analysis indicates that the 7CB-based system exhibits the lowest threshold voltage of 2.2&#xa0;V, demonstrating enhanced switching efficiency relative to 5CB (2.8&#xa0;V)&#xa0;and 8CB (3.0&#xa0;V)&#xa0;based ChLCs. Moreover, the&#xa0;photoluminescence studies demonstrated stronger emission intensity for&#xa0;7CB incorporated ChLCs system. &#xa0; These results indicate the crucial role of alkyl chain length in modulating material behavior and identify 7CB as an optimal mesogen for achieving high-performance ChLCs systems. Such insights pave the way for designing tunable, energy-efficient materials for future-generation displays, sensors, and photonic devices.</p>

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Tailoring dielectric and optical properties of cholesteric liquid crystals via alkyl chain length modulation

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Garima Chauhan,
  • Ashwani Kumar Singh,
  • Harsh Sharma,
  • Praveen Malik

摘要

Herein, we examined the effects of alkyl chain length variation on the optical and dielectric characteristics of cholesteric liquid crystals (ChLCs). Nematic liquid crystals with different alkyl chain lengths, 5CB, 7CB, and 8CB, were used with 5 wt% of chiral additive. The 7CB-based ChLC system exhibited an approximately 40% enhancement in permittivity relative to the 5CB counterpart. When the alkyl chain was extended to 8CB, the permittivity dropped by nearly 20% compared with that of the 5CB-based ChLC mixture. The electro-optical analysis indicates that the 7CB-based system exhibits the lowest threshold voltage of 2.2 V, demonstrating enhanced switching efficiency relative to 5CB (2.8 V) and 8CB (3.0 V) based ChLCs. Moreover, the photoluminescence studies demonstrated stronger emission intensity for 7CB incorporated ChLCs system.   These results indicate the crucial role of alkyl chain length in modulating material behavior and identify 7CB as an optimal mesogen for achieving high-performance ChLCs systems. Such insights pave the way for designing tunable, energy-efficient materials for future-generation displays, sensors, and photonic devices.