title: CIS-ZnS quantum dots for self-aligned liquid crystal molecules with superior electro-optic properties.
abstract: We demonstrate self-aligned and high-performance liquid crystal (LC) systems doped with 1-dimensional (1D) chain-like clusters of CuInS(2) (CIS)-ZnS core-shell quantum dots (QDs). By changing the cell fabrication method of the LC-QD composites, we can selectively control the orientation of the LC molecules between the homogeneous and homeotropic states without conventional LC alignment layers. The homeotropic alignment of LCs was achieved by random dropcasting and the homogeneous alignment was performed using a capillary injection of LC-QDs due to the random or linear diffusion of QD clusters into ITO defects. The electrically compensated bend (ECB)- and vertically aligned (VA) mode LC displays (LCDs) containing our LC-QD composite both showed superior electro-optic (EO) properties. A 37.1% reduction in the threshold voltage (V(th)) and a 36.6% decrease in the response time were observed for ECB mode LCDs, and a 47.0% reduction in the V(th) and a 38.3% decrease in the response time were observed for VA mode LCDs, meaning that the proposed LC-QD composites have a great potential for the production of advanced flexible LCDs.
authors.affiliation: Electronic Materials Research Institute, Kolon Central Research Park, Kolon Industries, Inc., Yongin 446-797, Republic of Korea.
authors.forename: Won-Kyu
authors.initials: WK
authors.lastname: Lee
authors.forename: Seung Jun
authors.initials: SJ
authors.lastname: Hwang
authors.forename: Min-Jae
authors.initials: MJ
authors.lastname: Cho
authors.forename: Hong-Gyu
authors.initials: HG
authors.lastname: Park
authors.forename: Jin-Woo
authors.initials: JW
authors.lastname: Han
authors.forename: Seogjeong
authors.initials: S
authors.lastname: Song
authors.forename: Jong Hyun
authors.initials: JH
authors.lastname: Jang
authors.forename: Dae-Shik
authors.initials: DS
authors.lastname: Seo
mesh_terms: D004553:Electric Conductivity; D008027:Light; D050866:Liquid Crystals / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D045663:Quantum Dots; D012542:Scattering, Radiation; D018036:Selenium Compounds / Q000737:chemistry*; D013499:Surface Properties; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D046911:Macromolecular Substances; D018036:Selenium Compounds; D017967:Zinc Compounds; C044696:zinc selenide