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Highly Fluorescent Liquid Crystals from Excited‐State Intramolecular Proton Transfer Molecules
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-12-03 , DOI: 10.1002/adom.201801349 Wanying Zhang 1 , Tsuneaki Sakurai 1 , Mika Aotani 1 , Go Watanabe 2 , Hiroyuki Yoshida 3 , Vikas S. Padalkar 1 , Yusuke Tsutsui 1 , Daisuke Sakamaki 1 , Masanori Ozaki 3 , Shu Seki 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-12-03 , DOI: 10.1002/adom.201801349 Wanying Zhang 1 , Tsuneaki Sakurai 1 , Mika Aotani 1 , Go Watanabe 2 , Hiroyuki Yoshida 3 , Vikas S. Padalkar 1 , Yusuke Tsutsui 1 , Daisuke Sakamaki 1 , Masanori Ozaki 3 , Shu Seki 1
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Fluorescence via excited‐state intramolecular proton transfer (ESIPT) provides strong light emission with a large Stokes shift and environment‐sensitive unique spectral patterns. Particular systems including 2‐(2‐hydroxyphenyl)benzothiazole (HBT) serve as efficient solid‐state emitters with the ESIPT mechanism and aggregation‐induced emission enhancement (AIEE) property, but have not been used for liquid crystalline (LC) materials. Here, rod‐shaped fluorescent LCs with ESIPT characters are newly developed based on the HBT motif. The design of the targeted molecules is in line with a simple design principle: a molecule with an alkyl tail, rigid ring, and active HBT core. The LC C6Ph‐HBT is highly luminescent in the solid state with an absolute fluorescence quantum yield (ΦFL) up to 0.39 and exhibits anisotropic fluorescence in its nematic LC phase. C6Ph‐HBT is miscible up to 6 wt% with a conventional room‐temperature (r.t.) nematic LC 4‐cyano‐4′‐pentylbiphenyl (5CB), allowing homogeneous fluorescent r.t. LCs. The LC mixture 5CB/C6Ph‐HBT shows ΦFL of 0.26 even in the nonaggregated state, and responds to an electric field with dynamic modulation of not only the optical transparency but also polarized fluorescence. The interplay of highly efficient fluorescence from ESIPT cores and their visible transparency is encouraging for future optical applications of the present molecular systems.
中文翻译：
激发态分子内质子转移分子的高荧光液晶
通过激发态分子内质子转移（ESIPT）发出的荧光提供了强大的发光，并具有大的斯托克斯位移和对环境敏感的独特光谱图。包括2-（2-羟苯基）苯并噻唑（HBT）在内的特殊系统可作为具有ESIPT机理和聚集诱导发射增强（AIEE）特性的高效固态发射器，但尚未用于液晶（LC）材料。在此，基于HBT主题新开发了具有ESIPT特性的棒状荧光LC。目标分子的设计符合简单的设计原理：具有烷基尾部，刚性环和活性HBT核心的分子。LC C 6 Ph-HBT在固态时具有高发光强度，具有绝对的荧光量子产率（ΦFL）高达0.39，并且在向列LC相中表现出各向异性荧光。C 6 Ph-HBT与常规室温（rt）向列型LC 4-氰基-4'-戊基联苯（5CB）的混溶度高达6 wt％，从而允许使用均相荧光rt LC。的LC混合物5CB / ç 6 PH-HBT节目Φ FL 0.26甚至在非聚集状态，并且响应不仅与光学透明度，而且偏振荧光的动态调制的电场。来自ESIPT核的高效荧光与其可见透明性之间的相互作用，对于本分子系统的未来光学应用而言是令人鼓舞的。
更新日期：2018-12-03
中文翻译：
激发态分子内质子转移分子的高荧光液晶
通过激发态分子内质子转移（ESIPT）发出的荧光提供了强大的发光，并具有大的斯托克斯位移和对环境敏感的独特光谱图。包括2-（2-羟苯基）苯并噻唑（HBT）在内的特殊系统可作为具有ESIPT机理和聚集诱导发射增强（AIEE）特性的高效固态发射器，但尚未用于液晶（LC）材料。在此，基于HBT主题新开发了具有ESIPT特性的棒状荧光LC。目标分子的设计符合简单的设计原理：具有烷基尾部，刚性环和活性HBT核心的分子。LC C 6 Ph-HBT在固态时具有高发光强度，具有绝对的荧光量子产率（ΦFL）高达0.39，并且在向列LC相中表现出各向异性荧光。C 6 Ph-HBT与常规室温（rt）向列型LC 4-氰基-4'-戊基联苯（5CB）的混溶度高达6 wt％，从而允许使用均相荧光rt LC。的LC混合物5CB / ç 6 PH-HBT节目Φ FL 0.26甚至在非聚集状态，并且响应不仅与光学透明度，而且偏振荧光的动态调制的电场。来自ESIPT核的高效荧光与其可见透明性之间的相互作用，对于本分子系统的未来光学应用而言是令人鼓舞的。
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