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In this experiment, devices of ferroelectric liquid crystal (FLC) were prepared by selecting ZLI-3654 FLC and SE-3140 alignment material. In order to study the influence of thermodynamic equilibrium state before the phase transition on the alignment of FLC, ten sets of experiments were carried out by changing the cooling rate during phase transition and thermodynamic equilibrium state before the phase transition. From experiments, a conclusion that the thermodynamic equilibrium state prior to chiral nematic-smectic A (N*-SmA) phase transition play an important role in realizing a uniform alignment of FLC devices, was obtained by comparing static contrasts of the devices. The static contrast ratio of our samples reached 620 ∶1 and the thermodynamic equilibrium state before N*-SmA phase transition was conducive to the formation of high contrast ratio FLC devices. The conclusion can provides a theoretical and practical guidance for the fabrication of FLC devices with I←→N*←→SmA←→S*mC←→Cr phase sequence.
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Keywords:
- ferroelectric liquid crystal /
- cooliong rate /
- thermodynamic equilibrium state /
- high contrast ratio devices
[1] Zheng Z G, Ma J, Song J, Liu Y G, Hu L F,Xuan L 2007 Acta Phys. Sin. 56 15 (in Chinese) [郑致刚、马 骥、宋 静、刘永刚、胡立发、宣 丽 2007 56 15]
[2] Yang P B,Cao L G,Hu W,Zhu Y Q, Guo Q,Yang X B 2008 Acta Phys. Sin. 57 285(in Chinese) [杨平保、曹龙贵、胡 巍、朱叶青、郭 旗、杨湘波 2008 57 285]
[3] Zheng Z G, Li W C, Liu Y G, Xuan L 2008 Acta Phys. Sin. 57 7344(in Chinese) [郑致刚、李文萃、刘永刚、宣 丽 2008 57 7344]
[4] Yin J L, Huang X G, Liu S H, Hu S J 2006 Acta Phys. Sin. 55 5268(in Chinese) [殷建玲、黄旭光、刘颂豪、胡社军 2006 55 5268]
[5] Ding H B, Pang W N, Liu Y B,Shang R C 2005 Acta Phys. Sin. 54 4097(in Chinese) [丁海兵、庞文宁、刘义保、尚仁成 2005 54 4097]
[6] Zhang R, He J, Peng Z H, Xuan L 2009 Chin. Phys. B 18 2885
[7] Zheng Z G, Song J, Zhang L L, Liu Y G, Guo F Z, Ma J, Li W C, Deng S P, Xuan L 2008 Chin. Phys. B 17 3227
[8] Wang Q H, Cheng J B 2005 Acta Photon. Sin. 34 357 (in Chinese)[王琼华、成建波 2005 光子学报 34 357]
[9] Wu P C, Wu J W 2007 J. Appl. Phys. 101 104513
[10] Clark N A, Lagerwall S T 1980 Appl. Phys. Lett. 36 899
[11] Zhu S Q, Pan W, Wang M Y 2005 Acta Photon. Sin. 34 218(in Chinese)[朱思奇、潘 炜、王梦遥 2005 光子学报 34 218]
[12] Kim Y J, Kim K S, Kim Y B 2002 Ferroelectrics 278 191
[13] Rieker T P, Clark N A, Smith G S, Parmar D S, Sirota E B, Safinya C R 1987 Phys. Rev. Lett. 59 2658
[14] Petkov Asˇ ek R, ACˇ opi Acˇ M, Pir Asˇ J 2006 J. Appl. Phys. 99 044103
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[1] Zheng Z G, Ma J, Song J, Liu Y G, Hu L F,Xuan L 2007 Acta Phys. Sin. 56 15 (in Chinese) [郑致刚、马 骥、宋 静、刘永刚、胡立发、宣 丽 2007 56 15]
[2] Yang P B,Cao L G,Hu W,Zhu Y Q, Guo Q,Yang X B 2008 Acta Phys. Sin. 57 285(in Chinese) [杨平保、曹龙贵、胡 巍、朱叶青、郭 旗、杨湘波 2008 57 285]
[3] Zheng Z G, Li W C, Liu Y G, Xuan L 2008 Acta Phys. Sin. 57 7344(in Chinese) [郑致刚、李文萃、刘永刚、宣 丽 2008 57 7344]
[4] Yin J L, Huang X G, Liu S H, Hu S J 2006 Acta Phys. Sin. 55 5268(in Chinese) [殷建玲、黄旭光、刘颂豪、胡社军 2006 55 5268]
[5] Ding H B, Pang W N, Liu Y B,Shang R C 2005 Acta Phys. Sin. 54 4097(in Chinese) [丁海兵、庞文宁、刘义保、尚仁成 2005 54 4097]
[6] Zhang R, He J, Peng Z H, Xuan L 2009 Chin. Phys. B 18 2885
[7] Zheng Z G, Song J, Zhang L L, Liu Y G, Guo F Z, Ma J, Li W C, Deng S P, Xuan L 2008 Chin. Phys. B 17 3227
[8] Wang Q H, Cheng J B 2005 Acta Photon. Sin. 34 357 (in Chinese)[王琼华、成建波 2005 光子学报 34 357]
[9] Wu P C, Wu J W 2007 J. Appl. Phys. 101 104513
[10] Clark N A, Lagerwall S T 1980 Appl. Phys. Lett. 36 899
[11] Zhu S Q, Pan W, Wang M Y 2005 Acta Photon. Sin. 34 218(in Chinese)[朱思奇、潘 炜、王梦遥 2005 光子学报 34 218]
[12] Kim Y J, Kim K S, Kim Y B 2002 Ferroelectrics 278 191
[13] Rieker T P, Clark N A, Smith G S, Parmar D S, Sirota E B, Safinya C R 1987 Phys. Rev. Lett. 59 2658
[14] Petkov Asˇ ek R, ACˇ opi Acˇ M, Pir Asˇ J 2006 J. Appl. Phys. 99 044103
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