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南京林业大学化学工程学院 应用化学系, 江苏 南京 210037
[ "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。Email:zjfphd@163. com" ]
[ "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。Email:xupeng5993@126. com" ]
纸质出版日期:2022-06-05,
收稿日期:2022-02-15,
修回日期:2022-03-02,
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郑军峰,宫佳鑫,程晓帆等.一种三态发光的液晶基元合成、自组装及光物理性质[J].发光学报,2022,43(06):869-878.
ZHENG Jun-feng,GONG Jia-xin,CHENG Xiao-fan,et al.Synthesis, Self-assembly and Photophysical Properties of A Three-state Highly Emissive Mesogen[J].Chinese Journal of Luminescence,2022,43(06):869-878.
郑军峰,宫佳鑫,程晓帆等.一种三态发光的液晶基元合成、自组装及光物理性质[J].发光学报,2022,43(06):869-878. DOI: 10.37188/CJL.20220047.
ZHENG Jun-feng,GONG Jia-xin,CHENG Xiao-fan,et al.Synthesis, Self-assembly and Photophysical Properties of A Three-state Highly Emissive Mesogen[J].Chinese Journal of Luminescence,2022,43(06):869-878. DOI: 10.37188/CJL.20220047.
聚集导致猝灭(ACQ)分子在单分子态(如稀溶液)高效发光,而聚集诱导发光(AIE)分子在聚集态(如固态)高效发光。这一单态发光的特性严重制约着发光材料的应用。本工作中,我们合成了一种三态(溶液、凝胶、液晶)发光的phasmid液晶基元(
PHAgen-12
),并考察了其自组装性质与光物理性质。
PHAgen-12
的两端为一代树枝单元,中间为“二苯基氰基乙烯(AIE)+二苯基丁二炔(ACQ)+二苯基氰基乙烯(AIE)”的刚性核,具有D-A-π-A-D的特征。该分子在普通溶剂(如THF、DCM)中可以溶解;在选择性溶剂烷烃中形成柱状胶束,并可凝胶化;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。
PHAgen-12
在单分子态表现出ACQ分子的性质,在氯仿中荧光量子产率(QY)为~90.3%;在聚集态表现出AIE性质,
PHAgen-12
/十二烷凝胶体系(质量百分比为30%)的QY为58.5%,本体液晶态的QY为85.5%。
Aggregation-caused quenching(ACQ) and aggregation-induced emission(AIE) molecules are highly emissive only in single molecular and aggregated state, respectively. This single-state emissive character highly hampers their applications. In this work, we synthesized a three-state(solution, gel and liquid crystal) highly emissive phasmid mesogen(
PHAgen-12
) and studied its self-assembly and photophysical properties.
PHAgen-12
consists of a long rod-like part ended by two Percec-type dendrons. The rod-like core is “cyanostilbene + diphenyl-diacetylene+cyanostilbene”, featuring a D-A-π-A-D type emitter.
PHAgen-12
can well dissolve in common solvents such as THF and DCM, form cylindrical micelle and further gel in selective solvents(alkanes), and develop into a hexagonal columnar liquid crystalline phase in bulk state, with four molecules in each monomolecule-thick(~0.44 nm) hexagonal unit cell. In dilute solution, it behaves like a ACQ molecule with a quantum yield(QY) up to 90.3 % in CHCl
3
. It renders a strong AIE character in condensed states, with a QY of 58.5% in
PHAgen-12/
dodecane gel system(30%(wt)) and a QY of 85.5% in bulk liquid crystalline state
多态发光液晶凝胶聚集诱导发光(AIE)聚集导致荧光猝灭(ACQ)
multi-state emissiveliquid crystalgelaggregation-induced emission(AIE)aggregation-caused quenching(ACQ)
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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: 10.1002/anie.201507031http://dx.doi.org/10.1002/anie.201507031
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