Highly Stable, Pretilted Homeotropic Alignment of Liquid Crystals Enabled by In Situ Self-Assembled, Dual-Wavelength Photoalignment,ACS Applied Electronic Materials

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Highly Stable, Pretilted Homeotropic Alignment of Liquid Crystals Enabled by In Situ Self-Assembled, Dual-Wavelength Photoalignment
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-06-15 , DOI: 10.1021/acsaelm.0c00295
Vineet Kumar ₁ , Zhiqiu Ye ₁ , Haodong Jiang _{1,

2} , Yue Shi _{1,

3} , Ke Li _{1,

4} , Davy Gérard ₄ , Dan Luo ₁ , Quanquan Mu ₅ , Yan Jun Liu _{1,

5}

Affiliation

Homeotropic alignment of liquid crystals (LCs) is one of the key modes used in commercial liquid crystal displays (LCDs) due to its advantages, such as high contrast ratios and fast response speed. Here, we report stable homeotropic LC alignment with a small pretilt angle in a nematic, negative LC host doped with additives including self-aligning agents, photoresponsive azo dyes, and reactive mesogen via an in situ self-assembled, dual-wavelength photoalignment approach. The underlying mechanism of stable, pretilted homeotropic LC alignment was further analyzed in detail. The achieved pretilted homeotropic LC cells are very stable against heat and UV light exposure and demonstrate excellent electro-optical characteristics. The experimental results show that such a noncontact, simple homeotropic alignment technique has big potential in many applications, such as high-quality LCDs, spatial light modulators, and other optoelectronic devices.

中文翻译：

通过原位自组装双波长光致对准实现的液晶的高度稳定，预倾斜的垂直排列

液晶（LC）的垂直排列由于其诸如高对比度和快速响应速度等优点而成为商业液晶显示器（LCD）中使用的关键模式之一。在这里，我们报告了通过向位，负向LC主体掺入包括自对准剂，光敏偶氮染料和反应性液晶元的添加剂的向列型负向LC主体，通过原位自组装，双波长光对准方法实现了稳定的垂直液晶对准，具有小的预倾角。进一步详细分析了稳定的，预倾同向液相色谱比对的基本机理。所获得的预倾斜的同质LC电池对热和紫外线照射非常稳定，并显示出出色的电光特性。实验结果表明，这种非接触式

更新日期：2020-07-28

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