低阈值电压柔性PDLC膜电光特性的研究

材料导报, 2009, 23(2): 1-5.

低阈值电压柔性PDLC膜电光特性的研究

刘国柱 ^1, , 夏都灵 ^2, , 黄子强 ^3, , 杨文君 ^4, , 康桂珍 ^5,

1.电子科技大学电子薄膜与集成器件国家重点实验室,成都,610054

2.电子科技大学电子薄膜与集成器件国家重点实验室,成都,610054

3.电子科技大学电子薄膜与集成器件国家重点实验室,成都,610054

4.电子科技大学电子薄膜与集成器件国家重点实验室,成都,610054

5.电子科技大学电子薄膜与集成器件国家重点实验室,成都,610054

基金项目: 成都市科技攻关项目(06GYB645GX-030)

关键词：聚合分散液晶 , 表面效应 , 黏度 , 阈值电压

Study of E-O Characteristics of Low-threshold Voltage Flexible PDLC Films

研究了以ITO-PET为基板柔性PDLC膜的电光特性,讨论了基板的表面效应、单体的黏度、膜厚、单体的含量等因素对PDLC膜电光特性的影响.研究发现,在相分离的过程中,与表面摩擦方向近似相互垂直的上下两柔性基板上的摩擦印痕边界之间易形成类似于槽栅状聚合物"壁垒".这些聚合物"壁垒"具有很强的表面锚定能,能固定液晶微滴,阻止其流动和相互之间团聚,使得细小液晶微滴能按照摩擦方向排列整齐,可以降低其阈值电压和饱和驱动电压,且提高了对比度.研究还发现单体与液晶二者之间黏度的匹配程度也是实现优异电光性能的关键因素之一.通过优化不同膜厚和单体的含量,制备出了具有低阈值电压、低饱和驱动电压、较高对比度的柔性PDLC膜.

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