Title :
Enhanced diffraction efficiency in a photorefractive liquid crystal cell with poly(9-vinylcarbazole)- infiltrated mesoporous TiO2 layers
Author :
Jang, Kwang-Suk ; Kim, Jong-Duk
Author_Institution :
Korea Adv. Inst. of Sci. & Technol., Daejeon
Abstract :
The photorefractive effect of a layer-structured liquid crystal cell was significantly enhanced when a C60-doped poly(9-vinylcarbazole) (PVK)/TiO2 nanocomposite was used in two photoconductive layers. The C60-doped PVK/TiO2 nanocomposite film was prepared by infiltrating C60-doped PVK into a highly ordered mesoporous TiO2 layer. The addition of the TiO2 layer to the C60-doped PVK layer increased the first-order Raman-Nath diffraction efficiency from 24% to 42.9%. This enhancement of diffraction efficiency is attributed to a blocking effect of charge recombination in the composite layer.
Keywords :
carbon; electron-hole recombination; light diffraction; mesoporous materials; nanocomposites; nematic liquid crystals; optical polymers; photorefractive materials; titanium compounds; TiO2:C; TiO2:C - Interface; blocking effect; charge recombination; enhanced diffraction efficiency; first-order Raman-Nath diffraction efficiency; infiltrated mesoporous layers; layer-structured liquid crystal cell; nanocomposite film; photorefractive effect; photorefractive liquid crystal cell; poly(9-vinylcarbazole); Diffraction; Liquid crystal devices; Liquid crystals; Mesoporous materials; Optical films; Photoconductivity; Photorefractive effect; Photorefractive materials; Polymers; Writing; liquid crystal; mesoporous TiO2; phtorefractive; two-beam coupling;
Conference_Titel :
Nanotechnology Materials and Devices Conference, 2006. NMDC 2006. IEEE
Conference_Location :
Gyeongju
Print_ISBN :
978-1-4244-0541-1
Electronic_ISBN :
978-1-4244-0541-1
DOI :
10.1109/NMDC.2006.4388767
