Xian Haiyu, Li Lin, Ding Yilei, Chu Mingjing, Ye Changqing
School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
Polymers (Basel). 2023 Apr 13;15(8):1860. doi: 10.3390/polym15081860.
In this work, we provide a fabrication method for dual-responsive electrochromic (EC) polymer dispersed liquid crystal (PDLC) devices. The EC PDLC device was developed by combing the PDLC technique and a colored complex formed via a redox reaction without a specific EC molecule in a simple preparation method. The mesogen played dual roles in the device for scattering in the form of microdroplets and participating in the redox reactions. Orthogonal experiments were performed with the acrylate monomer concentration, the ionic salt concentration, and the cell thickness as factors to investigate the electro-optical performance for the achievement of optimized fabrication conditions. The optimized device presented four switchable states modulated by external electric fields. The light transmittance of the device was changed by an alternative current (AC) electric field while the color change was realized by a direct current (DC) electric field. Variations of mesogen and ionic salt species can modulate the color and hue of devices, which solves the disadvantage of a single color for traditional EC devices. This work lays the foundation for realizing patterned multi-colored patterned displays and anti-counterfeiting via screen printing and inkjet printing techniques.
在这项工作中，我们提供了一种用于双响应电致变色（EC）聚合物分散液晶（PDLC）器件的制造方法。通过在一种简单的制备方法中结合PDLC技术和经由氧化还原反应形成的有色配合物（无需特定的EC分子）来开发EC PDLC器件。液晶基元在器件中发挥双重作用，以微滴形式散射并参与氧化还原反应。以丙烯酸酯单体浓度、离子盐浓度和盒厚为因素进行正交实验，以研究电光学性能，从而实现优化的制造条件。优化后的器件呈现出由外部电场调制的四种可切换状态。器件的透光率通过交流（AC）电场改变，而颜色变化则通过直流（DC）电场实现。液晶基元和离子盐种类的变化可以调节器件的颜色和色调，这解决了传统EC器件颜色单一的缺点。这项工作为通过丝网印刷和喷墨印刷技术实现图案化多色显示和防伪奠定了基础。
