High Solid-State Efficiency Fluorescent Main Chain Liquid Crystalline Polytriazoles with Aggregation-Induced Emission Characteristics

详细信息    查看全文

• 作者：Wang Zhang Yuan ; Zhen-Qiang Yu ; Youhong Tang ; Jacky W. Y. Lam ; Ni Xie ; Ping Lu ; Er-Qiang Chen ; Ben Zhong Tang
• 刊名：Macromolecules
• 出版年：2011
• 出版时间：December 27, 2011
• 年：2011
• 卷：44
• 期：24
• 页码：9618-9628
• 全文大小：1363K
• 年卷期：v.44,no.24(December 27, 2011)
• ISSN：1520-5835

文摘

Fluorescent liquid crystals (LCs) have wide applications in optoelectronic devices. However, the synthesis of high solid-state emission efficiency LCs is difficult. On one hand, impeding the aggregation of traditional luminogens is the prerequisite for high efficiencies; on the other hand, self-organization is an inherent attribute for LCs in the mesomorphic states. Because of such irreconcilable conflict, new strategy toward efficient fluorescent LCs is highly desirable. Herein, a conceptually new approach toward high efficiency fluorescent LCs is developed. Through rational design and combination of biphenyl-containing diazides and diynes carrying tetraphenylethylene units, soluble, regioregular, and liquid crystalline polytriazoles with high solid-state emission efficiencies (up to 63.7%) are obtained. The photophysical properties of the polymers are sensitive to their molecular structures and their solid-state quantum yields decrease with increasing spacer length. The spacer length also impacts on the mesomorphic properties. While polymers with rigid main chains exhibit nematicity, those with longer spacer lengths show better mesogenic packing and hence form smetcic phases.