Abstract
A multifunctional optical thin film (MOTF) is fabricated by coating the newly synthesized perylene-based reactive mesogen (PBRM) and stabilized by the subsequent photopolymerization. Based on the spectroscopic results combined with morphological observations, it is found that nematic liquid crystal (NLC) is aligned parallel to the molecular long axis of PBRM not only due to the long-range physical anchoring effect but also due to the short-range molecular physical interactions between alignment layer and NLC molecules. From the electro-optical properties of LC test cells fabricated with the PBRM MOTF, it is clearly demonstrated that the PBRM MOTF can work as the planar LC alignment layer as well as the in-cell coatable polarizer. The coatable PBRM MOTF from lyotropic chromonic reactive mesogens can pave a new way for the flexible optoelectronic devices.
Highlights
A multifunctional optical thin film (MOTF) is fabricated by coating the newly synthesized perylenebased reactive mesogen (PBRM) and stabilized by the subsequent photopolymerization
For the fabrication of multifunctional optical thin film (MOTF) which can be applied as an internal polarizer as well as an alignment layer, a perylene-based reactive mesogen (PBRM) is synthesized and the detail synthetic procedures are represented and found in the refs 36–38
The 5CB (Aldrich) nematic liquid crystal (NLC) showing nematic phase at room temperature is used for the investigation of the alignment and the electro-optical properties of the sample fabricated with the PBRM MOTF
Summary
Pureun Im1,*, Yu-Jin Choi1,*, Won-Jin Yoon[1], Dong-Gue Kang[1], Minwook Park[1], Dae-Yoon Kim[1], Cheul-Ro Lee[2], Seungbin Yang[3], Ji-Hoon Lee3 & Kwang-Un Jeong[1]. Our research group successfully fabricated the coatable thin film polarizer by the polymer-stabilization of macroscopically oriented lyotropic chromonic liquid crystal (LCLC)[28,29,30,31]. Our research group introduces a multifunctional optical thin film (MOTF) that can simultaneously serve as an in-cell polarizer as well as a planar alignment layer for nematic LC (NLC). To realize this concept, a perylene-based reactive mesogenic molecule (abbreviated as PBRM) containing diacrylate functional groups at the ends of the molecule is strategically designed and synthesized[36,37,38]. Electro-optical switching properties of the 5CB molecules in the twist nematic (TN) as well as in the in-plane switching (IPS) LC test cells are investigated wherein the PBRM MOTF is used as the alignment layer
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