Li Jiahua, Wang Jia-Hui, Cao Xiang-Jian, Li Xiao-Dong, Ren Xiang-Kui, Yu Zhen-Qiang
College of Chemistry and Environmental Engineering, Institute of Low-Dimensional Materials Genome Initiative, Shenzhen University, Shenzhen 518071, P. R. China.
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China.
ACS Appl Mater Interfaces. 2021 Jul 28;13(29):35207-35213. doi: 10.1021/acsami.1c10243. Epub 2021 Jul 19.
A blue-light-emitting liquid crystalline (LC) material was designed and prepared. By employing a twisted luminescent core (i.e., tetraphenylethene), four peripheral LC units with long alkyl chains and the small polar benzyl-ether-typed linking groups, the resulting material displayed a hexagonal columnar phase near room temperature and a disc-like nematic phase between 32 and 70 °C. The columnar LC showed a high quantum yield of 0.49 at 20 °C, and the efficient luminescence property was retained even in the isotropic phase at high temperature. Additionally, the fluidity of the nematic phase rendered the LC a non-volatile solvent, and the proper addition of a red dye led to the achievement of polarized white-light emission, which revealed a promising application prospect in LC display fabrication.
设计并制备了一种蓝色发光液晶（LC）材料。通过采用扭曲的发光核心（即四苯乙烯）、四个带有长烷基链的外围LC单元以及小的极性苄基醚型连接基团，所得材料在室温附近呈现六方柱状相，在32至70°C之间呈现盘状向列相。柱状LC在20°C时显示出0.49的高量子产率，即使在高温各向同性相中也能保持高效发光性能。此外，向列相的流动性使LC成为一种不挥发溶剂，适当添加红色染料可实现偏振白光发射，这在LC显示制造中展现出广阔的应用前景。
