Ultrastrong Red Circularly Polarized Luminescence Promoted from Chiral Transfer and Intermolecular Förster Resonance Energy Transfer in Ternary Chiral Emissive Nematic Liquid Crystals
Ultrastrong Red Circularly Polarized Luminescence Promoted from Chiral Transfer and Intermolecular Förster Resonance Energy Transfer in Ternary Chiral Emissive Nematic Liquid Crystals
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三元手性发射向列液晶中手性转移和分子间福斯特共振能量转移促进的超强红色圆偏振发光
DOI：
10.1021/acs.jpclett.0c03438
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Yixiang Cheng
中科院分区：
文献类型：
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作者：
Kun Yao;Yihao Shen;Yang Li;Xiaojing Li;Yiwu Qu;Yixiang Cheng
手性发光液晶（N*- lc）由于在一个组织良好的液晶体系中染料呈高度规则的螺旋排列，可以极大地放大圆偏振发光（CPL）信号。通常情况下，具有较高发光不对称系数（glum）和量子产率（QY）的CPL材料可以满足实际应用要求。本研究将四种手性聚集诱导发射（AIE）活性给体（客体A1-A4:R-C2，R-C4,R-C6,R-C8，手性掺杂剂和能量给体）和非手性AIE活性受体（客体B: PBCy， CPL发射极）分别掺杂到商用向列相液晶E7 （n - lc，宿主）中，形成具有CPL活性的三元手性发射n - lc （T-N*- lc）。这种T-N*-LCs通过分子间能量传递和超分子自组装的手性诱导，可以发射出QY = 16.56%、团聚量为1.51的强红色CPL。本研究为高光cpl材料的开发提供了有效的策略。
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% andglumup 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 highglumCPL materials.