Title :
Homogeneous Liquid Crystal Alignment on Ion Beam-Induced Y2Sn2O7 Layers
Author :
Yang Liu ; Hong-Gyu Park ; Ju Hwan Lee ; Sang Bok Jang ; Yoon Ho Jung ; Hae-Chang Jeong ; Dae-Shik Seo
Author_Institution :
Dept. of Electr. & Eng., Yonsei Univ., Seoul, South Korea
Abstract :
Y2Sn2O7 nanoparticle layer fabricated by ion beam (IB) irradiation after annealing is reported here. Spherical particles were induced after IB irradiation as demonstrated by field emission scanning electron microscopy. When this layer was used as an alignment layer, homogeneous alignment of nematic liquid crystals (LCs) was observed with a small pretilt angle due to van der Waals interactions between LCs and the Y2Sn2O7 layer and interactions between benzene rings of the LCs and broken chemical bonds. The resulting electric-controlled twist nematic cell showed excellent electrical-optical properties, indicating that our approach holds great potential for creating commercial LC displays (LCDs).
Keywords :
annealing; bonds (chemical); electro-optical effects; field emission electron microscopy; ion beam applications; molecular orientation; nanofabrication; nanoparticles; nematic liquid crystals; scanning electron microscopy; yttrium compounds; Y2Sn2O7; annealing; benzene rings; chemical bonds; electric-controlled twist nematic cell; electrical-optical properties; field emission scanning electron microscopy; homogeneous liquid crystal alignment; ion beam-induced layers; nanoparticle layer; nematic liquid crystals; spherical particles; van der Waals interactions; Annealing; Ion beams; Liquid crystal displays; Liquid crystals; Morphology; Radiation effects; Thermal stability; Y2Sn2O7; alignment layer; ion beam; liquid crystals;
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2015.2399505
