Excitation-Dependent Circularly Polarized Luminescence Inversion Driven by Dichroic Competition of Achiral Dyes in Cholesteric Liquid Crystals

IF 16.1 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Dr. Kun Yao, Zhentan Wang, Dr. Peng Wang, Dr. Yang Li, Dr. Liangyu Hu, Prof. Yixiang Cheng, Dr. Zhongxing Geng
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Abstract

The development of stimuli-responsive chiral cholesteric liquid crystals (CLCs) materials holds significant potential for achieving three-dimensional (3D) anti-counterfeiting and multi-level information encryption. However, constructing phototunable CLCs systems with easy fabrication and fast response remains a great challenge. Herein, we exploit an excitation-dependent CLCs (ExD-CLCs) material by establishing dynamically photoresponsive dichroic competition between two achiral dyes: a negative dichroic dye (SP-COOH) and a positive dichroic dye (Nile Red, NR) within a CLCs medium. The ExD-CLCs exhibits a negative circularly polarized luminescence (CPL) signal (glum=−0.16) at 625 nm when excited at 365 nm. Remarkably, under excitation at 430 nm, the CPL signal is inverted, and the glum value increases to +0.26. Notably, the helical superstructure and handedness of the ExD-CLCs remain unchanged during this reversal process. The CPL signal reversal is driven by the dichroic competition between the SP-COOH dimer, which displays strong negative dichroism in its open-ring isomer form and silent negative dichroism in its closed-ring isomer form, and the NR dye, which exhibits static positive dichroism. Leveraging these excitation-dependent CPL properties, the quadruplex numerical anti-counterfeiting using ExD-CLCs is achieved.

Abstract Image

胆甾液晶中非手性染料二向色竞争驱动的激发依赖性圆偏振发光反转
刺激响应性手性胆甾液晶(CLCs)材料的发展在实现三维(3D)防伪和多层次信息加密方面具有重要的潜力。然而,构建易于制造和快速响应的光可调谐CLCs系统仍然是一个巨大的挑战。在此,我们通过在两种非手性染料(负二色性染料(SP-COOH)和正二色性染料(尼罗红,NR)之间建立动态光响应二色性竞争,开发了一种激发依赖性CLCs (ExD-CLCs)材料。当365 nm激发时,ExD-CLCs在650 nm处表现出负CPL信号(glum = -0.16)。值得注意的是,在430 nm激发下,CPL信号反转,glum值增加到+0.26。值得注意的是,在这个逆转过程中,ExD-CLCs的螺旋上层结构和手性保持不变。CPL信号反转是由SP-COOH二聚体与NR染料之间的二色性竞争驱动的,SP-COOH二聚体在开环异构体中表现出强烈的负二色性,而在闭环异构体中表现出沉默的负二色性。利用这些与激励相关的CPL特性,利用ExD-CLCs实现了四重数值防伪。
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来源期刊
CiteScore
26.60
自引率
6.60%
发文量
3549
审稿时长
1.5 months
期刊介绍: Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.
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