Title :
Electrical and optical properties of discotic liquid crystals with various core structures
Author :
Azumai, R. ; Ozaki, M. ; Yoshino, K. ; Ohta, K.
Author_Institution :
Dept. of Electron. Eng., Osaka Univ., Japan
Abstract :
Electrical and optical properties in discotic liquid crystals having various core structures such as triphenylene, phthalocyanine, metal phthalocyanine and other aromatic moieties have been studied. The electrical conductivity, photoconductivity and carrier mobility are measured as a function of temperature and molecular alignment. The anisotropy of the conductivity and carrier mobility have been confirmed. The molecular alignment characteristics of various discotic liquid crystals have also been investigated by means of a polarizing microscope observation. An excellent uniform molecular alignment, in which the columnar axis aligns perpendicular to the substrates, has been observed in the tetragonal columnar phase of liquid crystal with rare-earth phthalocyanine core.
Keywords :
carrier mobility; discotic liquid crystals; electrical conductivity; molecular orientation; optical microscopy; optical properties; organic compounds; photoconductivity; anisotropy; aromatic moieties; carrier mobility; columnar axis; core structures; discotic liquid crystals; electrical conductivity; electrical properties; metal phthalocyanine; molecular alignment; optical properties; photoconductivity; phthalocyanine; polarizing microscopy; rare-earth phthalocyanine core; temperature; tetragonal columnar phase; triphenylene; uniform molecular alignment; Conductivity measurement; Electric variables measurement; Electrodes; Liquid crystal polymers; Liquid crystals; Optical harmonic generation; Optical microscopy; Optical polarization; Optical polymers; Temperature;
Conference_Titel :
Dielectric Liquids, 2002. ICDL 2002. Proceedings of 2002 IEEE 14th International Conference on
Print_ISBN :
0-7803-7350-2
DOI :
10.1109/ICDL.2002.1022778
