材料科学
掺杂剂
电致变色
液晶
胆甾液晶
光电子学
电致变色装置
透射率
兴奋剂
光散射
散射
双稳态
聚合物
液晶显示器
吸收(声学)
光学
复合材料
电极
化学
物理化学
物理
作者
Xiaoshuai Li,Yuqiang Guo,Meishan Zhang,Chi Zhang,Rui Niu,Hongmei Ma,Yubao Sun
标识
DOI:10.1021/acsami.2c17770
摘要
Bistable polymer-stabilized cholesteric liquid crystal (LC) devices have been extensively researched due to their energy-saving benefits. Compared to devices with merely transparent and light-scattering states, LC devices with controlled light absorption or changeable color functions are unquestionably more intriguing. In this paper, a polymer-stabilized ion-doped cholesteric LC and an electrochromic layer are used to fabricate a colorable device which can show four operating states: transparent, light-scattering, colored transparent, and colored light-scattering. The working principle and fabrication strategy are explained in detail. Based on the dielectric response of LC, the electrohydrodynamic effect of ion-doped LC, and the redox reaction of electrochromic materials, the transparent or light-scattering state and the colored or colorless state of the device can be regulated by controlling the alternating frequency and the direction of the electric field. The display performance related to the monomer, chiral dopant, and electrochromic layer is investigated. The content of monomer and chiral dopant affects the polymer network and pitch of cholesteric LC, which then affects the driving voltages and contrast ratio. The thickness of the electrochromic layer has a significant impact on the transmittance of the device's coloring and fading states. The sample with excellent operating states is obtained by optimizing the material and the construction, which can be widely applied in smart windows and energy-saving display devices.
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