具有聚集诱导发光功能的圆偏振发光液晶材料  

Circularly polarized luminescent liquid crystal materials with aggregation-induced emission functionality

作　　者：张茂鑫 乔世一 张翱[1] 方一[1] 廖瑞娟 张春秀[1] 于海峰[2] ZHANG Mao-xin;QIAO Shi-yi;ZHANG Ao;FANG Yi;LIAO Rui-juan;ZHANG Chun-xiu;YU Hai-feng(College of Printing and Packing Engineering,Beijing Institute of Graphic Communication,Beijing 102600,China;School of Materials Science and Engineering,Peking University,Beijing 100871,China)

机构地区：[1]北京印刷学院印刷与包装工程学院,北京102600 [2]北京大学材料科学与工程学院,北京100871

出　　处：《液晶与显示》2023年第10期1305-1321,共17页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.92156011);北京市自然科学基金(No.2222055);北京交通大学发光与光信息技术教育部重点实验室开放课题(No.KLLI0BJTUKF2204);北京市教委科技计划一般项目(No.KM201910015010,No.KM202110015009);北京印刷学院项目(No.Ec202206,No.Ee202203,No.Eb202201,No.21090123007)。

摘　　要：圆偏振光是光矢量端点轨迹为圆的光,它在传播时光矢量的大小不变而振动方向随相位而改变。通常,非偏振光首先通过偏振片转化为线偏振光,再通过λ/4波片分解为左旋或右旋圆偏振光。这一物理过程所获得的圆偏振光能量损耗一般超过50%。而通过构筑聚集诱导发光手性液晶分子直接获得圆偏振光,可以获得高的荧光量子效率和大的不对称因子,有效降低了能量损耗。因此,聚集诱导发光手性液晶受到了研究人员的广泛关注。本文基于聚集诱导发光基团修饰手性液晶分子的设计与合成,以及手性聚集诱导发光分子体系掺杂向列相液晶这两类方法,综述了本领域的研究进展,讨论了聚集诱导发光液晶分子结构设计和聚集态的形成对圆偏振发光和聚集诱导发光性能的影响,展望了这种新型光学材料所面临的机遇和挑战。Circularly polarized light is a type of light in which the endpoint trajectory of the light vector forms a circle.During its propagation,the magnitude of the light vector remains constant while the vibration direction changes along with phase.Typically,unpolarized light is first converted to linearly polarized light through a polarizer and then transformed into left-handed or right-handed circularly polarized light using a quarter-wave plate.However,this physical process results in an energy loss higher than 50%for circularly polarized light.By introducing aggregation-induced emission(AIE)properties into chiral liquid crystal molecules,circularly polarized light can be directly obtained with a high fluorescence quantum efficiency and a large asymmetric factor,thereby achieving effective reduction of energy loss.Consequently,AIE chiral liquid crystals have gained increasing attention from researchers in relevant fields.This review summarizes the recent progress in this field,focusing on the design and synthesis of chiral liquid crystal molecules modified with AIE luminophores and the doping of chiral AIE molecule systems into nematic liquid crystal phases.The influence of the chemical structure design of AIE liquid crystal molecules and the formation of aggregates on circularly polarized luminescence and AIE performance are discussed.Finally,the existing challenges and opportunities for this new optical material are prospected.

关 键 词：聚集诱导圆偏振发光液晶材料 手性液晶基团 不对称因子 荧光量子效率 

分 类 号：O753.2[理学—晶体学] O482.31