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브러시 코팅 공정에 의해 유도된 LaGaO 박막의 액정 배향

Liquid Crystal Orientation on LaGaO Thin Films Induced by a Brush Coating Process

오병윤
한국전기전자학회 (Institute of Korean Electrical and Electronics Engineers)|2024.09|전기전자학회논문지 (Journal of IKEEE)|제28권 제3호|pp. 261-270|DOI 10.7471/ikeee.2024.28.3.261

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키워드

Liquid Crystal DisplayLiquid Crystal OrientationLiquid Crystal Alignment FilmsLaGaO Thin FilmsBrush Coating ProcessMetal Oxide Thin Films
주제분류전자/정보통신공학

초록

본 연구에서는 졸-겔 방법으로 란타늄 갈륨 산화물(LaGaO) 용액을 제조하였다. 브러시 코팅 공정을 이용해서 기판에 용액을 코팅한 후 경화온도를 변화시켜 LaGaO 박막을 간단하게 형성함으로써, 액정디스플레이 산업에서 사용하는 액정 배향막으로서의 적용 가능성을 확인하였다. 편광 광학 현미경 관찰을 통해 LaGaO 박막의 경화온도가 높아짐에 따라 균일하게 액정분자가 정렬되는것을 확인할 수 있었다. 230°C로 경화된 LaGaO 박막에서 낮은 선경사각을 가지며, 원자현미경을 통해 단일 방향으로 LaGaO 입자가 형성됨을 확인하였다. X-선 광전자 분광법을 통해 LaGaO 금속산화물 박막이 잘 형성됨을 알 수 있었다. 최종적으로 높은 광학 투과율과 함께 우수한 전기ㆍ광학적 특성이 나타남으로써 LaGaO 금속산화물이 신규 액정 배향막 소재로서의 가능성이 있음을확인하였다.

Abstract

In this study, a lanthanum gallium oxide (LaGaO) solution was prepared using a sol-gel method. By simplyforming a LaGaO thin film through adjusting the curing temperature after applying the solution onto the substrateusing a brush coating process, the potential for use as a liquid crystal (LC) alignment film in the LC displayindustry was validated. Through optical microscope observation, it was confirmed that the LC molecules wereuniformly aligned as the curing temperature of the LaGaO thin film increased. It was confirmed that the LaGaOthin film cured at 230°C had low pretilt angle, and that LaGaO particles were formed in a single direction asobserved through an atomic force microscope. Through X-ray photoelectron spectroscopy, it was found that theLaGaO metal oxide thin film was well formed. Finally, it has been confirmed that LaGaO metal oxide has thepotential as a novel LC alignment film material, as it exhibits excellent electrical and optical properties, alongwith high optical transmittance

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