Smart-Responsive HOF Heterostructures with Multiple Spatial-Resolved Emission Modes towards Photonic Security Platform.

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, we report the first smart-responsive HOF heterostructure with multiple spatial-resolved emission modes for covert photonic security platform. 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 emissive 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 anti-counterfeiting label application. These results offer a promising route to design function-oriented smart responsive HOF micro-devices towards advanced anticounterfeiting applications. This article is protected by copyright. All rights reserved.