液晶与显示
 
     首 页 |  期刊介绍  |  编委会  |  投稿指南  |  期刊订阅  |  数据库收录  |  道德声明  |  联系我们  |  English
液晶与显示 2009, 24(04) 487-492  ISSN:  CN

本期目录 | 下期目录 | 过刊浏览 | 高级检索                                                            [打印本页]   [关闭]
材料物理和化学
单体材料结构对全息聚合物分散液晶光栅电光特性的影响
刘永刚1;郑致刚1,2;彭增辉1;胡立发1;曹召良1;李文萃1,2;宣 丽1
1. 中国科学院 长春光学精密机械与物理研究所 应用光学国家重点实验室,吉林 长春 130033,E-mail: ygliujilin@yahoo.com.cn;2. 中国科学院 研究生院,北京 100039
摘要

使用3种分子结构不同的单体材料体系制备了全息聚合物分散液晶光栅,对所制备光栅的形貌、衍射特性、驱动特性、单体双键转化率等进行了研究。研究结果表明:体系中单体材料结构刚性的增加有助于相分离结构的改善。由柔性单体制备的光栅样品,双键转化率低,光栅液晶区域液晶微滴尺寸小,驱动电压高;刚性适度的样品,其光栅液晶区域液晶微滴较大,衍射能力达到96%,实际衍射效率为82%,且曝光结束后单体的单体双键转化率达到了57%,驱动电压为8.3 V/μm;随着单体材料结构刚性的继续增加,光栅液晶微滴反而变小,液晶区域变窄,驱动电压升高。因此,合理增加单体的刚性程度有助于提高光栅相分离及光栅的电光特性。

关键词 全息聚合物分散液晶   相分离   衍射效率   双键转化率  
Influence of Chemical Structure of Monomers on Electro-Optical Characteristics of HPDLC Gratings
LIU Yong-gang1;ZHENG Zhi-gang1,2;PENG Zeng-hui1;HU Li-fa1;CAO Zhao-liang1;LI Wen-cui1,2;Xuan Li1
1. State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China,E-mail:ygliujilin@yahoo.com.cn;2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China
Abstract:

Holographic polymer dispersed liquid crystal is a kind of novel photoelectronomic information functional device. In this study, effect of chemical structure of monomers on holographic polymer dispersed liquid crystal gratings was investigated from the morphology, the diffraction efficiency, the electro-optical tunable performance and ene-conversions, respectively. The results showed that, the chemical structure of monomers plays an important role in performance of H-PDLC gratings. A rigid molecular structure forms a clear morphology, high diffraction efficiency and low threshold voltage gratings than a flexible molecular structure. In addition, the rigidity ring increases interactions between molecules and restricts the motion between them, thus enhances the phase separation, electro-optical characteristics and ene-conversions. On the other hand, with the rigid structure of monomer material increase, making the volume of LC droplets become smaller, LC regional narrow, so the drive voltage was increased, however, there is still a drop than flexible molecules. Therefore increa-sing the rigid structure of monomer reasonably can improve the phase separation and electro-optical properties of HPDLC gratings.

Keywords: holographic polymer dispersed liquid crystal   phase separation   diffraction efficiency   double bond conversion rate  
收稿日期 2009-02-24 修回日期 1900-01-01 网络版发布日期 2009-08-30 
基金项目:

通讯作者:
作者简介:
作者Email:

参考文献:
[1]. Drzaic P S, Gonzales A M. Refractive index gradients and light scattering in polymer-dispersed liquid crystal films [J]. Appl. Phys. Lett., 1993, 62(12):1332-1334.
[2]. Aphonin O A, Panina Y U V, Pravdin A B, et al. Optical properties of stretched polymer dispersed liquid crystal Film [J]. Liq. Crys., 1993,15(3): 395-407.
[3]. Sutherland R L, Natarajan L V, Tondiglia V P, et al. Electrically switchable volume gratings in polymer-dispersed liquid crystals [J]. Appl. Phys. Lett., 1994, 64(9):1074-1076.
[4]. Crawford G P, Fiske T G, Silverstein L D. Reflective color LCDs based on H-PDLC and PSCT technologies [J]. SID Digest Technol. Paper, 1996, 27: 99-102.
[5]. Domash L H, Chen Y M, Gomatam B N, et al. Switchable-focus lenses in holographic polymer-dispersed liquid crystal [J]. Proc. SPIE, 1996, 2689: 188-194.
[6]. Sutherland R L, Natarajan L V, Tondiglia V P, et al. Switchable holograms for displays and telecommunications [J]. Proc. SPIE, 2001, 4463: 1-10.
[7]. Bunning T J, Natarajan L V, Tondiglia V P, et al. Holographic polymer-dispersed liquid crystals (H-PDLCs)[J]. Annu. Rev. Mater. Sci., 2000,30: 83-87.
[8]. Pogue R T, Natarajan L V, Tondiglia V P, et al. Controlling nanoscale morphology in switchable PDLC gratings [J]. Proc. SPIE, 1998, 3475:2-11.
[9]. Lin J C, Taylor P L. Polymerization-induced phase separation of a liquid crystal-polymer mixture [J]. Mol. Cryst. Liq. Cryst., 1993, 237(13):25-31.
[10]. 阮圣平,彭增辉,于涛,等. 全息液晶/聚合物光栅的制备[J]. 液晶与显示 ,2002, 17(5):331-334.
[11]. 张斌,刘言军,贾瑜,等. 全息聚合物弥散液晶材料衍射特性的优化[J]. 物理学报, 2003, 52(1):91-95.
[12]. 张斌,刘言军,徐克璹. 全息聚合物弥散液晶器件电光特性的研究[J]. 物理学报, 2004,53(06):1850-1856.
[13]. 宋静,郑致刚,刘永刚,等.含氟单体材料对全息聚合物分散液晶光栅电光特性的影响 [J] . 液晶与显示, 2006, 21 (5):443-449.
[14]. 刘永刚,马骥,宋静,等.单体平均官能度对制备液晶/聚合物光栅的影响 [J]. 液晶与显示, 2005,20 (3):210-214.
[15]. Zheng Z, Song J, Liu Y, et al. Single-step exposure for two-dimensional electrically-tuneable diffraction grating based on polymer dispersed liquid crystal[J]. Liq. Cryst., 2008,35(4):489-499.
[16]. Zheng Z, Ma J, Li W, et al. Improvements in morphological and electro-optical properties of polymer dispersed liquid crystal grating using a highly fluorine-substituted acrylate monomer[J]. Liq. Cryst., 2008,35(7):885-893.
[17]. Wu B G, Erdmann J H, Doane J W. Response times and voltages for PDLC light shutters[J]. Liq. Cryst., 1989,5(5):1453-1465.
本刊中的类似文章
1.张攀, 杨德兴, 徐健, 郭钰宁.全息波导显示中输出扩展光栅的衍射效率分布分析[J]. 液晶与显示, 2014,29(5): 703-708
2.蔡林君, 王文超, 颜竹君.胶囊化胆甾液晶薄膜在不同基板下的光电性能[J]. 液晶与显示, 2012,(2): 139-143
3.宋 静;郑致刚;刘永刚;宣 丽.一次曝光法制备二维可调谐液晶光栅[J]. 液晶与显示, 2009,24(6): 827-830
4.刘国柱;黄子强;杨文君;夏都灵;张翠玉;康桂珍.低阈值电压聚合物分散性液晶膜的电光特性[J]. 液晶与显示, 2009,24(3): 383-388
5.董守梅;万欣瑞;张春梅;阎 斌;汪映寒.大分子光引发剂及固化时间对PDLC膜光电性能的影响[J]. 液晶与显示, 2009,24(1): 48-51

Copyright by 液晶与显示