分極した高次スメクティック相からの偏光電界発光と偏光面の回転

抄録

In electroluminescence from chiral liquid crystals comprised of bis(fluorophenyl)terthiophene unit with macroscopic polarization, two characteristic phenomena were observed. First, hole and electron injection barriers at the electrodes were remarkably reduced by the internal electric field produced by the macroscopic polarization of the liquid crystal, resulting low threshold voltage for 2 m thick samples with the symmetric structure. Second, linearly polarized light was emitted from the polarized liquid crystal phase under the DC bias application and the polarization axis of the electroluminescence was rotated in 90 degree by the inversion of the polarity of the DC bias applied during the phase transition from the chiral smectic A phase to the chiral smectic G phase. This is the first report on the linearly polarized electroluminescence whose polarization axis could be modulated.