STTR Phase II: High Twisting Power Chiral Materials for Nanostructured Bragg Reflective Displays

这个小型企业技术转移（STTR）二期项目开发了一种新的手性材料，二氧唑烷，它提供了前所未有的螺旋扭转力。当添加到向列相液晶时，只需要百分之几的浓度就可以将向列相扭曲成具有周期性光波长的紧密螺旋。由于浓度低，手性添加剂不会稀释向列材料的重要物理性质，从而优化胆甾显示的亮度、对比度、速度和低工作电压。作为简单的分子结构，二恶烷衍生物可以在左和右两个部分合成，这是第一次使胆甾显示的反射亮度几乎翻倍，接近我们习惯从纸上看到的亮度。二期研究包括基础研究和应用研究两部分。基本组分研究了手性化合物和寄主混合物的螺旋扭力及其与分子结构的关系。应用组件使用这些信息来设计和开发用于电子书和其他手持设备的高级胆甾显示的手性添加剂。手性材料将用于主要用于手持设备的显示产品，在这些设备中，低功耗、阳光可读性和高分辨率、全彩图像的广角观看非常重要。目标设备有电子书、手机、寻呼机等。

This Small Business Technology Transfer (STTR) Phase II Project develops a new class of chiral materials, the dioxolanes, which provide unprecedented helical twisting power. When added to a nematic liquid crystal, a concentration of only a few percent is required to twist the nematic phase into a tight helix with a periodicity of the wavelength of light. Because of the low concentration, the chiral additive does not dilute important physical properties of the nematic material required to optimize Cholesteric displays for brightness, contrast, speed and low operating voltages. Being simple molecular structures, dioxolane derivatives can be synthesized in both left and right hand moieties to enable, for the first time, Cholesteric displays that nearly double the reflective brightness to where it approaches that which we are used to seeing from paper. Phase II research has both a basic and an applied component. The basic component studies the helical twisting power and its relationship to the molecular structure of the chiral compounds and host mixtures. The applied component uses this information to design and develop chiral additives for advanced Cholesteric displays for use in electronic books and other handheld devices.The chiral materials will be used in display products primarily used in handheld devices whee low power, sunlight readability, and wide angle viewing of high resolution, full color images are important. Devices targeted are electronic book, cell phones, pagers, etc.