Flexible and Patterned Thin Film Polarizer: Photopolymerization of Perylene-based Lyotropic Chromonic Reactive Mesogens

Pureun Im, Dong Gue Kang, Dae Yoon Kim, Yu Jin Choi, Won Jin Yoon, Myong Hoon Lee, In-Hwan Lee, Cheul Ro Lee, Kwang Un Jeong

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

A perylene-based reactive mesogen (DAPDI) forming a lyotropic chromonic liquid crystal (LCLC) phase was newly designed and synthesized for the fabrication of macroscopically oriented and patterned thin film polarizer (TFP) on the flexible polymer substrates. The anisotropic optical property and molecular self-assembly of DAPDI were investigated by the combination of microscopic, scattering and spectroscopic techniques. The main driving forces of molecular self-assembly were the face-to-face π-π intermolecular interaction among aromatic cores and the nanophase separation between hydrophilic ionic groups and hydrophobic aromatic cores. Degree of polarization for the macroscopically oriented and photopolymerized DAPDI TFP was estimated to be 99.81% at the Λmax = 491 nm. After mechanically shearing the DAPDI LCLC aqueous solution on the flexible polymer substrates, we successfully fabricated the patterned DAPDI TFP by etching the unpolymerized regions selectively blocked by a photomask during the photopolymerization process. Chemical and mechanical stabilities were confirmed by the solvent and pencil hardness tests, and its surface morphology was further investigated by optical microscopy, atomic force microscopy, and three-dimensional surface nanoprofiler. The flexible and patterned DAPDI TFP with robust chemical and mechanical stabilities can be a stepping stone for the advanced flexible optoelectronic devices.

Original languageEnglish
Pages (from-to)762-771
Number of pages10
JournalACS Applied Materials and Interfaces
Volume8
Issue number1
DOIs
Publication statusPublished - 2016 Jan 13
Externally publishedYes

Keywords

  • lyotropic chromonic liquid crystal
  • perylene-diimide
  • photopolymerization
  • polarizability
  • reactive mesogen

ASJC Scopus subject areas

  • Materials Science(all)

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