Lv Yuanchao, Liang Jiashuai, Xiong Zhile, Yang Xue, Li Yunbin, Zhang Hao, Xiang Shengchang, Chen Banglin, Zhang Zhangjing
Fujian Provincial Key Laboratory of Polymer Materials, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, 350007, China.
Adv Mater. 2024 Mar;36(9):e2309130. doi: 10.1002/adma.202309130. Epub 2023 Dec 13.
Luminescent hydrogen-bonded organic frameworks (HOFs) with the unique dynamics and versatile functional sites hold great potential application in information security, yet most of responsive HOFs focus on the single-component framework with restrained emission control, limiting further applications in advanced confidential information protection. Herein, the first smart-responsive HOF heterostructure with multiple spatial-resolved emission modes for covert photonic security platform is reported. The HOF heterostructures are prepared by integrating different HOFs into a single microwire based on a hydrogen-bond-assisted epitaxial growth method. The distinct responsive behaviors of HOFs permit the heterostructure to simultaneously display the thermochromism via the framework transformation and the acidichromism via the protonation effect, thus generating multiple emission modes. The dual stimuli-controlled spatial-resolved emission modes constitute the fingerprint of a heterostructure, and enable the establishment of the smart-responsive photonic barcode with multiple convert states, which further demonstrate the dynamic coding capability and enhanced security in anticounterfeiting label applications. These results offer a promising route to design function-oriented smart responsive HOF microdevices toward advanced anticounterfeiting applications.
具有独特动力学和多功能功能位点的发光氢键有机框架（HOFs）在信息安全领域具有巨大的潜在应用价值，然而，大多数响应型HOFs都集中在具有受限发射控制的单组分框架上，这限制了其在高级机密信息保护中的进一步应用。在此，报道了首个用于隐蔽光子安全平台的具有多种空间分辨发射模式的智能响应型HOF异质结构。该HOF异质结构是基于氢键辅助外延生长方法，通过将不同的HOF整合到单个微丝中制备而成。HOFs独特的响应行为使异质结构能够通过框架转变同时呈现热致变色，并通过质子化效应呈现酸致变色，从而产生多种发射模式。双刺激控制的空间分辨发射模式构成了异质结构的指纹，并能够建立具有多种转换状态的智能响应光子条形码，这进一步证明了其在防伪标签应用中的动态编码能力和增强的安全性。这些结果为设计面向功能的智能响应型HOF微器件用于先进的防伪应用提供了一条有前景的途径。
