Guo Qi, Zhang Mingjiang, Tong Zhi, Zhao Shanshan, Zhou Yajie, Wang Yaxin, Jin Shan, Zhang Jie, Yao Hong-Bin, Zhu Manzhou, Zhuang Taotao
Division of Nanomaterials & Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, Hefei230026, China.
Key Laboratory of Structure and Functional Regulation of Hybrid Materials, Ministry of Education, Anhui University, Hefei, Anhui230601, China.
J Am Chem Soc. 2023 Feb 1. doi: 10.1021/jacs.2c13108.
Nations, industries, and aspects of everyday life have undergone forgery and counterfeiting ever since the emergence of commercialization. Securing documents and products with anticounterfeit additives shows promise for authentication, allowing one to combat ever-increasing global counterfeiting. One most-used effective encryption strategy is to combine with optical-security markers on the required protection objects; however, state-of-the-art labels still suffer from imitation due to their poor complexity and easy forecasting, as a result of deterministic production. Developing advanced anticounterfeiting tags with unusual optical characters and further incorporating complex security features are desired to achieve multimodal, unbreakable authentication capacity; unfortunately, this has not yet been achieved. Here, we prepare a series of stable circularly polarized luminescence (CPL) materials, composed of toxicity-free, high-quality-emitting inorganic quantum dots (QDs) and liquid crystals, using a designed helical-coassembly strategy. This CPL system achieves a figure of merit (FM, assessing the performance of both luminescence dissymmetry and quantum yield) value of 0.39, fulfilling practical demands for anticounterfeiting applications. Based on these CPL structures, we produce a type of multimodal-responsive security materials (MRSMs) that exhibits six different stimuli-responsive modes, including light activation, polarization, temperature, voltage, pressure, and view angle. Thus, we show a proof-of-principle blockchain-like integrated anticounterfeiting system, allowing multimodal-responsive, interactive/changeable information encryption-decryption. We further encapsulate the obtained security materials into a fiber to expand our materials to work on flexible fabrics, that is, building an intelligent textile with a color-adaptable function along with environmental change.
自从商业化出现以来，国家、行业以及日常生活的方方面面都经历过伪造和假冒行为。使用防伪添加剂来保护文件和产品在认证方面显示出了前景，有助于人们应对日益严重的全球假冒问题。一种最常用的有效加密策略是在所需保护对象上结合光学安全标记；然而，由于其复杂性差且易于预测（这是确定性生产的结果），目前最先进的标签仍然容易被模仿。开发具有独特光学特性的先进防伪标签并进一步融入复杂的安全特征，以实现多模态、不可破解的认证能力，是人们所期望的；不幸的是，这一目标尚未实现。在此，我们采用一种设计好的螺旋共组装策略，制备了一系列由无毒、高质量发光的无机量子点（QDs）和液晶组成的稳定圆偏振发光（CPL）材料。这个CPL系统实现了品质因数（FM，用于评估发光不对称性和量子产率的性能）值为0.39，满足了防伪应用的实际需求。基于这些CPL结构，我们制备了一种多模态响应安全材料（MRSMs），它表现出六种不同的刺激响应模式，包括光激活、偏振、温度、电压、压力和视角。因此，我们展示了一种类似区块链的原理验证集成防伪系统，实现了多模态响应、交互式/可变信息的加密解密。我们进一步将获得的安全材料封装到纤维中，以便将我们的材料扩展到可在柔性织物上使用，即打造一种具有随环境变化而变色功能的智能纺织品。
