光-电驱动下的AIE-active手性高分子CPL液晶器件研究

以AIE-active的D-A/D-π-A型手性高分子CPL液晶材料为导向，光-电驱动下发射高量子效率(ФFL)和不对称因子(gem)的 AI-CPL器件为目标。如在手性高分子中引入液晶基元、AIE-active基团、donor与acceptor基团，调控其能级带隙，在胆甾相中，发射可见光全波段的手性高分子AI-CPL材料。手性蓝光高分子与非手性AIE-active红光发光团在胆甾液晶相介质中，形成规整有序的手性超分子组装体，通过分子间FRET和手性诱导，非手性红色发光团可发射高ФFL和gem值的红色AI-CPL。具有螺旋结构的手性联萘高分子在液晶介质中组装成更加规整的螺旋排列，可进一步放大手性信号，促进CPL发射增强。如调整掺杂比例，基于蓝-红二元色调互补，调配出白光(冷或暖)，光-直流电驱动下，液晶器件可发射白色CPL，实现通过光-电技术手段产生的CPL转成实际应用。

In this program, we will focus on the design and synthesis of a series of D-A/D-π-A type chiral polymers containing biphenyl cyano group of liquid crystal unit and AIE-active group. These chiral polymers can act as visible full-color and white CPL emitters by introducing various donor and acceptor ability groups on polymer main chain backbone to regulate intramolecular ICT and energy gap in cholesteric liquid crystals. Chiral emissive liquid crystals can emit strong red AI-CPL with both high quantum yield and gem value through intermolecular FRET and chirality induction from regular supramolecular self-assemble of three component liquid crystal system. Helical chiral naphthyl-based polymers can further form the highly regular helix arrangement in cholesteric liquid crystals and effectively promote chiral amplification effect and gem value increase. Cool or hot white AI-CPL liquid crystal device can be achieved by choosing the color match between chiral blue and red dyes at the appropriate ratio under the excitation of light and DC electric field.