Controllable CPL response driven by achiral UV-photosensitive dichroic dye through cholesteric liquid crystals

IF 10.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Science China Chemistry Pub Date : 2023-12-20 DOI:10.1007/s11426-023-1846-0

Yihan Chen, Yang Li, Hang Li, Lulu Li, Yiwu Quan, Yixiang Cheng

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Abstract

Versatile stimuli-responsive circularly polarized luminescent (CPL) materials have potential applications in information storage, security encryption, and intelligent displays. In this study, the Z/E isomerization of ultraviolet (UV)-photosensitive achiral α-cyanostilbene derivative was used as an achiral dichroic dye (Switch) to drive the controllable CPL-active response in cholesteric liquid crystals (CLCs). Under irradiation by 365 nm UV light, the resulting CLCs-Z-Switch underwent a Z-to-E configuration isomerization as CLCs-E-Switch, accompanied by a decrease in its dichroic order parameter (S_F value) from 0.15 to 0.07. Although the quantum yield (QY) of CLCs-E-Switch increased from 8.1% (CLCs-Z-Switch) to 16.8%, the corresponding g_lum values of CPL emission decreased from +0.55/−0.57 to +0.37/−0.39 due to a decrease in the order of helical arrangement of E-Switch in E7 media. This study enables photosensitive CLCs-Switch to be applied for optical information storage devices.

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通过胆甾烷液晶实现非手性紫外光敏感二色性染料驱动的可控 CPL 响应

多功能刺激响应型圆偏振发光（CPL）材料在信息存储、安全加密和智能显示方面具有潜在的应用价值。在这项研究中，利用对紫外线（UV）光敏的非手性α-氰基二苯乙烯衍生物的 Z/E 异构化作为非手性二色性染料（Switch），在胆甾液晶（CLC）中驱动可控的 CPL 活性响应。在 365 nm 紫外光照射下，生成的 CLCs-Z-Switch 发生了 Z 到 E 构型的异构化，成为 CLCs-E-Switch，同时其二色性阶次参数（SF 值）从 0.15 降至 0.07。虽然 CLCs-E-Switch 的量子产率（QY）从 8.1%（CLCs-Z-Switch）提高到了 16.8%，但由于 E-Switch 在 E7 介质中的螺旋排列顺序降低，CPL 发射的相应胶值从 +0.55/-0.57 降低到了 +0.37/-0.39。这项研究使光敏 CLCs-Switch 能够应用于光信息存储设备。

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来源期刊

Science China Chemistry CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

14.40

自引率

7.30%

发文量

3787

审稿时长

2.2 months

期刊介绍： Science China Chemistry, co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China and published by Science China Press, publishes high-quality original research in both basic and applied chemistry. Indexed by Science Citation Index, it is a premier academic journal in the field. Categories of articles include: Highlights. Brief summaries and scholarly comments on recent research achievements in any field of chemistry. Perspectives. Concise reports on thelatest chemistry trends of interest to scientists worldwide, including discussions of research breakthroughs and interpretations of important science and funding policies. Reviews. In-depth summaries of representative results and achievements of the past 5–10 years in selected topics based on or closely related to the research expertise of the authors, providing a thorough assessment of the significance, current status, and future research directions of the field.