Synthesis, Phase Structure and Photophysical Property of A Liquid Crystalline Molecule with High Emission Efficiency both in Solution and Solid State

ZHENG Junfeng; CHENG Xiaofan; GE Yunchong; GONG Jiaxin; XU Peng

doi:10.37188/CJL.20220428

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Synthesis, Phase Structure and Photophysical Property of A Liquid Crystalline Molecule with High Emission Efficiency both in Solution and Solid State

Synthesis and Properties of Materials | 更新时间：2023-06-15

- Synthesis, Phase Structure and Photophysical Property of A Liquid Crystalline Molecule with High Emission Efficiency both in Solution and Solid State
  增强出版
- Chinese Journal of Luminescence Vol. 44, Issue 5, Pages: 863-872(2023)
- 作者机构：
  
  南京林业大学化学工程学院应用化学系，江苏南京　210037
- 作者简介：
- 基金信息：
- DOI：10.37188/CJL.20220428
  CLC： O753⁺.2
- Published：05 May 2023，
  
  Received：25 December 2022，
  
  Revised：12 January 2023，
- 稿件说明：
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郑军峰,程晓帆,葛云翀等.固液双态高效发光的液晶分子的合成、相结构及光物理性质[J].发光学报,2023,44(05):863-872.

ZHENG Junfeng,CHENG Xiaofan,GE Yunchong,et al.Synthesis, Phase Structure and Photophysical Property of A Liquid Crystalline Molecule with High Emission Efficiency both in Solution and Solid State[J].Chinese Journal of Luminescence,2023,44(05):863-872.
郑军峰,程晓帆,葛云翀等.固液双态高效发光的液晶分子的合成、相结构及光物理性质[J].发光学报,2023,44(05):863-872. DOI： 10.37188/CJL.20220428.

ZHENG Junfeng,CHENG Xiaofan,GE Yunchong,et al.Synthesis, Phase Structure and Photophysical Property of A Liquid Crystalline Molecule with High Emission Efficiency both in Solution and Solid State[J].Chinese Journal of Luminescence,2023,44(05):863-872. DOI： 10.37188/CJL.20220428.

摘要

常见的有机发光分子主要有聚集导致猝灭（ACQ）分子和聚集诱导发光（AIE）分子。前者仅在单分子态（如稀溶液）高效发光，而后者仅在聚集态（如固态）高效发光。本工作中，我们合成了一种在稀溶液和聚集态均能高效发光的液晶分子（

MS⁃12

），并表征了其液晶性质和光物理性质。

MS⁃12

的两端为树枝单元，中间为长棒状的刚性核，可看作典型的Phasmid型液晶基元；刚性核由氰基二苯乙烯（AIE单元）和苯炔苯（ACQ单元）单元构成；由于氰基的强吸电子效应，

MS⁃12

具有D

⁃

D的结构特征。

MS⁃12

在固态形成六方柱状液晶相，单分子层厚度（～0.44 nm）的单胞内含有～4个分子；其在稀溶液态高效发光，在四氢呋喃中荧光量子产率（QY）～78.1%，在固态表现出AIE分子的性质，在本体液晶态的QY～59.6%。本研究为多态发光分子的设计，尤其是多态发光液晶分子的设计提供了有效的方案。

Abstract

Organic luminogens can be divided roughly into two main classes： aggregation-caused quenching （ACQ） and aggregation-induced emission （AIE） molecules， which are highly emissive only in single molecular and aggregated state， respectively. In this work， we synthesized a liquid crystalline molecule （

MS⁃12

） with high emission efficiency both in solution and solid state and studied its liquid crystalline and photophysical properties.

MS⁃12

consists of a long rod-like core ended by two Percec-type dendrons. The rigid core is composed of cyanostilbene and diphenylacetylene units， featuring a D-A-π-A-D emitter. It renders a hexagonal columnar liquid crystalline phase in bulk state， with four molecules in each monomolecular-thick（～0.44 nm） hexagonal unit cell. In dilute solution， it behaves like a ACQ molecule with a quantum yield（QY） up to 78.1% in THF. It shows a strong AIE character in condensed state， with a QY of 59.6% in bulk liquid crystalline state. This work provides a general strategy to multi-state emissive organic luminogens， those in particular with liquid crystalline properties.

关键词

聚集诱导发光（AIE）聚集导致荧光淬灭（ACQ）多态发光液晶

Keywords

aggregation-induced emission（AIE）aggregation-caused quenching（ACQ）multi-state emissiveliquid crystal

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郑军峰（1983-），男，河南平舆人，博士，讲师，2012年于北京大学获得博士学位，主要从事高分子合成、自组装与功能的研究。. doi: 10.1039/c8sc01377bhttp://dx.doi.org/10.1039/c8sc01377b

E⁃mail: zjfphd@163. com. doi: 10.1039/c8sc01377bhttp://dx.doi.org/10.1039/c8sc01377b

徐鹏（1981-），男，江苏东台人，博士，副教授，2008年于吉林大学获得博士学位，主要从事高分子合成与组装的研究。. doi: 10.1039/c8sc01377bhttp://dx.doi.org/10.1039/c8sc01377b

E⁃mail： xupeng5993@126. com. doi: 10.1039/c8sc01377bhttp://dx.doi.org/10.1039/c8sc01377b

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