Self-Aligned Liquid Crystals on Anisotropic Nano/Microstructured Lanthanum Yttrium Strontium Oxide Layer

Dong Wook Lee, Dong Hyun Kim, Jin Young Oh, Dae Hyun Kim, Se Hoon Choi, Jin Ah Kim, Hong Gyu Park, Dae Shik Seo

Research output: Contribution to journalArticlepeer-review


We propose an efficient alignment method for liquid crystals (LCs). A brush-coating method handles film deposition and LC alignment treatment simultaneously herein, meaning a reduction in the conventional alignment layer treatment process steps. A lanthanum yttrium strontium oxide (LaYSrO) film prepared by the sol–gel process was used for the alignment layer. Topographical details of the brush-coated LaYSrO films (compared with spin-coated films) were investigated by atomic force microscopy. Spin-coated LaYSrO meant that the film formation alone without orientation treatment represented an isotropic surface. On the other hand, the 270 °C-cured brush-coated LaYSrO showed nano/microstructure with directionality. It indicates that brush-hair sweeping induced shearing stress on the sol state of the LaYSrO, which results in surface anisotropy for LC alignment. The uniform LC alignment state was confirmed by polarized optical microscopy and pretilt analysis. The brush-coated LaYSrO shows fine optical transparency compared to plain and indium-tin-oxide coated glasses, and thermal stability up to 150 °C for LC alignment. Competitive electro-optical performances of the brush-coated LaYSrO were verified in a twisted-nematic LC system compared to those of the conventionally used polyimide layer. Consequently, we expect that the brush-coating process can be an innovative technology for LC alignment.

Original languageEnglish
Article number6843
Issue number19
Publication statusPublished - 2022 Oct

Bibliographical note

Funding Information:
This research was funded by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2022-0121) and by the MSIT (Ministry of Science and ICT), Korea, under the Innovative Human Resource Development for Local Intellectualization support program (IITP-2022-RS-2022-00156361) supervised by the IITP (Institute for Information & communications Technology Planning & Evaluation).

Publisher Copyright:
© 2022 by the authors.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics


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