title: Tilted Orientation of Photochromic Dyes with Guest-Host Effect of Liquid Crystalline Polymer Matrix for Electrical UV Sensing.
abstract: We propose a highly oriented photochromic dye film for an ultraviolet (UV)-sensing layer, where spirooxazine (SO) derivatives are aligned with the liquid crystalline UV-curable reactive mesogens (RM) using a guest-host effect. For effective electrical UV sensing with a simple metal-insulator-metal structure, our results show that the UV-induced switchable dipole moment amount of the SO derivatives is high; however, their tilting orientation should be controlled. Compared to the dielectric layer with the nearly planar SO dye orientation, the photochromic dielectric layer with the moderately tilted dye orientation shows more than seven times higher the UV-induced capacitance variation.
authors.affiliation: School of Electronics Engineering, Kyungpook National University, Daegu 702-701, Korea. amid@ee.knu.ac.kr.
authors.forename: Amid
authors.initials: A
authors.lastname: Ranjkesh
authors.affiliation: School of Electronics Engineering, Kyungpook National University, Daegu 702-701, Korea. mkpark@ee.knu.ac.kr.
authors.forename: Min-Kyu
authors.initials: MK
authors.lastname: Park
authors.affiliation: Department of Sensor and Display Engineering, Kyungpook National University, Daegu 702-701, Korea. parkdohyuk@gmail.com.
authors.forename: Do Hyuk
authors.initials: DH
authors.lastname: Park
authors.affiliation: School of Electronics Engineering, Kyungpook National University, Daegu 702-701, Korea. jspark19@ee.knu.ac.kr.
authors.forename: Ji-Sub
authors.initials: JS
authors.lastname: Park
authors.affiliation: School of Electronics Engineering, Kyungpook National University, Daegu 702-701, Korea. jcchoi@ee.knu.ac.kr.
authors.forename: Jun-Chan
authors.initials: JC
authors.lastname: Choi
authors.affiliation: Department of Textile System Engineering, Kyungpook National University, Daegu 702-701, Korea. skokim@knu.ac.kr.
authors.forename: Sung-Hoon
authors.initials: SH
authors.lastname: Kim
authors.affiliation: School of Electronics Engineering, Kyungpook National University, Daegu 702-701, Korea. rineey@ee.knu.ac.kr.|Department of Sensor and Display Engineering, Kyungpook National University, Daegu 702-701, Korea. rineey@ee.knu.ac.kr.
authors.forename: Hak-Rin
authors.initials: HR
authors.lastname: Kim
keywords: UV-sensing; guest-host effect; liquid crystal; metal-insulator-metal (MIM) structure; photochromic dye; spirooxazine (SO)