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Ultrastrong Red Circularly Polarized Luminescence Promoted from Chiral Transfer and Intermolecular Förster Resonance Energy Transfer in Ternary Chiral Emissive Nematic Liquid Crystals
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-12-31 , DOI: 10.1021/acs.jpclett.0c03438
Kun Yao 1, 2 , Yihao Shen 1 , Yang Li 1, 2 , Xiaojing Li 1 , Yiwu Quan 2 , Yixiang Cheng 1
Affiliation  

Chiral emissive liquid crystals (N*-LCs) have been proved to greatly amplify the circularly polarized luminescence (CPL) signals due to highly regular spiral arrangement of dyes in a well-organized liquid crystals system. Normally, CPL materials with a high luminescence dissymmetry factor (glum) and quantum yield (QY) can meet the real application requirement. Here, four chiral aggregate-induced emission (AIE) active donors (Guests A1–A4: R-C2, R-C4, R-C6, R-C8, chiral dopant, and energy donor) and achiral AIE-active acceptors (Guest B: PBCy, CPL emitter) were doped into the commercial nematic liquid crystals E7 (N-LCs, Host) to form CPL-active ternary chiral emissive N-LCs (T-N*-LCs), respectively. This kind of T-N*-LCs could emit strong red CPL with QY = 16.56% and glum up to 1.51 through intermolecular energy transfer and chirality induction from the supramolecular self-assembly of T-N*-LCs. This work provides the effective strategy for the development of high glum CPL materials.

中文翻译:

三元手性发射向列液晶中的手性转移和分子间福斯特共振能量转移促进了超强红色圆偏振发光。

事实证明,由于染料在组织良好的液晶系统中呈高度规则的螺旋排列,因此手性发射液晶(N * -LC)可以极大地放大圆偏振发光(CPL)信号。通常,具有高发光不对称因子(g lum)和量子产率(QY)的CPL材料可以满足实际的应用需求。在这里,有四个手性聚集体诱导发射(AIE)活性供体(来宾A1-A4:R -C2,R -C4,R -C6,R-C8,手性掺杂剂和能量供体)和非手性AIE活性受体(来宾B:PBCy,CPL发射体)被掺杂到商用向列液晶E7(N-LC,主体)中,形成CPL活性三元手性发射态N -LC(TN * -LC)。这类TN * -LCs通过分子间能量转移和TN * -LCs超分子自组装诱导的手性诱导,可发出QY = 16.56%的强红色CPL,g lum可达1.51。这项工作提供了高发展的有效策略LUM CPL材料。
更新日期:2021-01-14
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