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

Volume

1

fYear

2006

fDate

22-25 Oct. 2006

Firstpage

360

Lastpage

361

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 C_60-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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/NMDC.2006.4388767

Filename

4388767