Regulating Circularly Polarized Luminescent Behavior of Luminescent Liquid Crystalline Polymers through Resonance Energy Transfer
Regulating Circularly Polarized Luminescent Behavior of Luminescent Liquid Crystalline Polymers through Resonance Energy Transfer
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DOI：
10.1021/acs.macromol.3c00002
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发表时间：
2023-03
期刊：
影响因子：
5.5
通讯作者：
Zhi-wang Luo;Ao Huang;Hui-Ying Luo;Jin-Kang Chen;Jiang Huang;He-Lou Xie
中科院分区：
文献类型：
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作者：
Zhi-wang Luo;Ao Huang;Hui-Ying Luo;Jin-Kang Chen;Jiang Huang;He-Lou Xie
圆偏光发光材料在显示器件、光学仪器、仿生等领域有着重要的应用前景。在本研究中，我们设计并制备了一种手性发光液晶聚合物，即聚（4,4'，4″-三羧基甲酸-氧四苯基乙烯-甲基丙烯酸酯）（P1）。偏光显微镜（POM）和x射线衍射（XRD）结果表明，该聚合物形成六方柱状相。圆偏振发光（CPL）实验表明，聚合物在整体上没有观察到CPL信号，但与少量4-氰基-4′-戊基联苯（5CB） （P1@5CB）混合的聚合物呈现出较强的CPL信号，发光不对称因子（glum）为+0.18。以P1为能量/手性给体，以非手性长波尼罗红（NR）染料为受体，通过Förster共振能量转移（FRET）调控CPL。与P1@5CB相比，所得到的化合物显示出高达160 nm的色移发射，并且也发射出光亮度为+0.20的高效CPL。结果表明，通过非辐射共振能量转移和手性转移，实现了对高效CPL的可控调节。
Circularly polarized luminescent materials show significant application in display devices, optical instruments, bionic fields, etc. In this work, we design and prepare a chiral luminescent liquid crystalline polymer, namely, poly(4,4',4″-tricholesterylformate-oxytetraphenylethylene-methyl acrylic acid ester) (P1). Polarizing optical microscopy (POM) and X-ray diffraction (XRD) results indicate that this polymer forms a hexagonal columnar phase. Circularly polarized luminescence (CPL) experiment shows that no CPL signal is observed for the polymer in the bulk, but the polymer mixed with a small amount of 4-cyano-4′-pentylbiphenyl (5CB) (P1@5CB) presents a strong CPL signal with a luminescence asymmetry factor (glum) of +0.18. Further, Förster resonance energy transfer (FRET) is adopted to regulate the CPL using P1 as energy/chiral donors and the achiral long-wavelength Nile red (NR) dyes as acceptors. The resultant compound shows a bathochromically shifted emission by up to 160 nm compared with P1@5CB and also emits an efficient CPL with aglumof +0.20. This result demonstrates that the controllable regulation of efficient CPL with an efficient glumis realized through nonradiative resonance energy transfer and chiral transfer.