Highly Efficient Luminescent Liquid Crystal with Aggregation-Induced Energy Transfer
Highly Efficient Luminescent Liquid Crystal with Aggregation-Induced Energy Transfer
复制标题
具有聚集诱导能量转移的高效发光液晶
DOI：
10.1021/acsami.8b14575
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发表时间：
2019
影响因子：
9.5
通讯作者：
Tang Ben Zhong
中科院分区：
文献类型：
--
作者：
Liu Yi;You Li Hong;Lin Fa Xu;Fu Kuo;Yuan Wang Zhang;Chen Er-Qiang;Yu Zhen-Qiang;Tang Ben Zhong
通过蓝色发射四苯乙烯核和发光介晶甲苯基团的化学共轭，合理构建了具有高效固态发射的发光液晶分子（TPEMes），这两种分子都具有聚集诱导发射特性。对于这种荧光团，聚集诱导的能量从发射的托兰介晶转移到发光的四苯乙烯单元，赋予分子在悬浮态和块体状态下的纯蓝色发射。结合差示扫描量热法、偏光显微镜和一维 X 射线衍射 (1D XRD) 实验，推断化合物 TPEMes 具有热力学上更稳定的层状晶相，并且由于动力学原因可以“冻结”成单向近晶中间相。一维 XRD 表明，由于 TPEMes 在晶相中的堆积更加致密，因此晶相中 TPEMes 的发光相对于亚稳态中间相蓝移了 17 nm。
A luminescent liquid crystal molecule (TPEMes) with efficient solid-state emission is rationally constructed via the chemical conjugation of blue-emitting tetraphenylethene cores and luminescent mesogenic tolane moieties, which are both featured with aggregation-induced emission properties. As for this fluorophore, aggregation-induced energy transfer from the emissive tolane mesogens to the lighting-up tetraphenylethene units endows the molecule pure blue emission in the suspension and bulk state. Combining differential scanning calorimetry, polarized optical microscope, and one-dimensional X-ray diffraction (1D XRD) experiments, the compound TPEMes is deduced to adapt thermodynamically more stable layered crystalline phase and can be “frozen” into a monotropic smectic mesophase due to kinetic reasons. As a result of more dense packing of TPEMes in the crystalline phase indicated by 1D XRD, the luminescence of TPEMes in crystalline phase blue-shifted by 17 nm relative to the metastable mesophase.