Interfacial AIE for Orthogonal Integration of Holographic and Fluorescent Dual‐Thermosensitive Images

Abstract

Orthogonal integration of thermosensitive images is of vital significance for advanced anticounterfeiting, which however remains formidably challenging due to the trade-off that facile thermoresponse needs easy molecular motion while robust imaging requires molecular restriction. Herein, a viable approach is demonstrated to tackle the challenge by in situ fixing a predesigned aggregation induced emission luminogen (AIEgen) at the polymer/liquid crystal (LC) interface via precisely controlled interfacial engineering, in which the AIEgen is enriched in LC phases during polymerization induced phase separation and subsequently driven to the interface by the interfacial thiol-ene click reaction. Crosstalk-free integration of holographic and fluorescent dual-thermosensitive images with high sensitivity, high contrast ratio, and robust performance is successfully realized in a single unit, attributed to the simultaneously LC-facilitated AIEgen molecular motion and polymer-restricted AIEgen diffusion at the interface. The exciting characteristics of these orthogonally integrated dual images will enable them to prevent illegal replication and thus are expected to be promising for high-security-level anticounterfeiting applications.

Light-Controlled Direction of Distributed Feedback Laser Emission by Photo-Mobile Polymer Films

“…Polymer composites are widely used for fabrication of optical and photonic systems [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. In particular, they are exploited for the fabrication of holographic volume phase gratings [ 3 , 4 , 12 , 15 , 17 , 18 , 26 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ].…”

Orthogonal integration of holographic and fluorescent dual images based on energy transfer from liquid crystals to a photocleavable AIEgen

“…22–28 Particularly, orthogonal integration of dual-mode optical patterns in the same region has drawn considerable attention since 2020 for significantly increasing the information density, capacity and security of optical labels. 7,12,20,29–32…”

Liquid crystal-assisted manufacturing of flexible holographic polymer nanocomposites for high-security level anticounterfeiting

“…The fast growth of the counterfeiting market at a compound annual rate of B14% has not only caused serious negative impacts to the global economy and social development but also led to disastrous implications on human health and national security, forcing us to develop high-security level and highly efficient authentication methods. [1][2][3][4][5][6][7][8][9][10][11] To this end, many effective approaches have been proposed based on holography, [12][13][14][15][16] aggregation-induced emission, [15][16][17][18][19] and other photoluminescence or photochromism technologies. [20][21][22][23][24][25][26] Particularly, holography stands out since more degrees of freedom of light (e.g., amplitude, phase, polarization and orbital angular momentum) apart from the wavelength can be utilized to code and decode the confidential information.…”

“…22,30,39 In addition, the LC ordering can be switched by thermal or electric stimuli, 30,43 which may provide more security functions to the holographic 3D images. 15,16,44 However, flexible manufacturing of holographic photopolymer/ LC composites has not been realized. This is mainly because these composites are normally fabricated via in situ photopolymerization-induced phase separation of reaction systems comprising the LC and photopolymerizable monomers, 41,45 and the system viscosity is basically required to be low (o30 mPa s) for achieving good phase separation.…”