Nano/microgroove zirconium‐doped lanthanum oxide film with self‐aligned molecules for liquid crystal device application

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-15 DOI:10.1002/sia.7344

Bo‐Kyeong Choi, J. Oh, Dae-Hyun Kim, Dong Wook Lee, Dae-Shik Seo

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Abstract

Herein, we propose a brush‐coated zirconium‐doped lanthanum oxide (ZrLaO) film as a liquid crystal (LC) alignment layer. The film‐curing temperature was adjusted to 70, 150, and 230°C. Polarized optical microscopy and pre‐tilt angle analysis confirmed that there was uniform and homogeneous LC alignment on the 230°C cured ZrLaO film. Atomic force microscopy revealed that the surface had a nano/microgroove structure, which was caused by the shear stress generated by the brush‐coating process. This structure induced the uniform LC alignment. X‐ray photoelectron spectroscopy verified that the ZrLaO film was well‐formed on a glass substrate. The ZrLaO film displayed hydrophilic characteristics, and its surface energy increased as the film‐curing temperature increased. The ZrLaO alignment layer displayed suitable optical transmittance for LC device applications. The ZrLaO layer‐based twisted‐nematic LC cell exhibited more stable switching properties and better threshold voltage characteristics than conventional polyimide layers. Therefore, we expect that this brush‐coated ZrLaO layer will be a suitable LC alignment layer for LC device applications.

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用于液晶设备的纳米/微槽掺锆氧化镧薄膜与自排列分子

在此，我们提出了一种刷涂掺锆氧化镧（ZrLaO）薄膜作为液晶（LC）配向层。薄膜固化温度分别为 70、150 和 230°C。偏光光学显微镜和预倾斜角分析证实，在 230°C 固化的氧化锆薄膜上，液晶排列均匀一致。原子力显微镜显示，表面具有纳米/微槽结构，这是由于刷涂过程中产生的剪应力造成的。这种结构促使 LC 均匀排列。X 射线光电子能谱验证了 ZrLaO 膜在玻璃基底上的良好成型。ZrLaO 薄膜具有亲水性，其表面能随着固化温度的升高而增加。ZrLaO 配向层具有适合 LC 器件应用的透光率。与传统的聚酰亚胺层相比，基于 ZrLaO 层的扭曲向列液晶电池具有更稳定的开关特性和更好的阈值电压特性。因此，我们预计这种刷涂 ZrLaO 层将成为适用于 LC 器件应用的 LC 配向层。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.