Kang Jianxin, Yu Jian, Li Anran, Zhao Dongyu, Liu Bin, Guo Lin, Tang Benzhong
Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, P.R. China.
Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, P.R. China.
iScience. 2019 May 31;15:119-126. doi: 10.1016/j.isci.2019.04.017. Epub 2019 Apr 15.
Aggregation-induced emission (AIE) system has long been regarded as a promising substitute to overcome the aggregation-caused quenching in traditional luminescent liquid crystals, which could further enhance its efficiency and application. However, due to the intrinsic weak interaction between hybrid components, heterogeneous inorganic materials-induced AIE process was rarely reported. In this study, trace amounts of amorphous AgS microrods and an AIE-active liquid crystalline compound tetraphenylethylene-propylbenzene (TPE-PPE) were proposed to construct additional intense interaction to trigger AIE effect. The enhanced concentration of unsaturated Ag ions and excess positive charge on AgS surface promote a cation-π interaction with TPE-PPE, leading to a 36-fold increase in fluorescence, which is predominately high in luminescent liquid crystal system. To the best of our knowledge, this is the first report of the AIE process activated by cation-π interaction. This novel approach would provide guidance to fabricate high-luminescence meso phases for future luminescent display device.
聚集诱导发光（AIE）体系长期以来一直被视为一种有前途的替代方案，以克服传统发光液晶中因聚集导致的猝灭现象，这可以进一步提高其效率和应用价值。然而，由于杂化组分之间固有的弱相互作用，关于异质无机材料诱导的AIE过程的报道很少。在本研究中，提出了痕量的非晶态AgS微棒和一种具有AIE活性的液晶化合物四苯乙烯-丙基苯（TPE-PPE），以构建额外的强相互作用来触发AIE效应。AgS表面不饱和Ag离子浓度的增加和过量正电荷促进了与TPE-PPE的阳离子-π相互作用，导致荧光增强36倍，这在发光液晶体系中尤为突出。据我们所知，这是首次关于由阳离子-π相互作用激活的AIE过程的报道。这种新方法将为未来发光显示器件制备高发光介观相提供指导。
