Dual Image Storage Material for Anti-Counterfeiting
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Solution Overview
Problem
Current optical anti-counterfeiting technologies face challenges in combining holographic and fluorescent display technologies effectively, as most organic fluorescent materials exhibit a significant decrease in fluorescence brightness in a solid state, affecting the quality of dual optical anti-counterfeit images.
Innovation Solution
A dual image storage material is developed, comprising a holographic pattern visible under sunlight and a fluorescent pattern under ultraviolet light, achieved by a selective photoreaction of organic fluorescent materials, liquid crystals, and photopolymerizable monomers, ensuring independent display of both images without compromising the brightness of the holographic image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If organic fluorescent materials are used in dual image storage material, then fluorescent display capability is improved, but fluorescence brightness decreases due to aggregation-caused quenching effect
Solution Approach 1:
The patent introduces liquid crystal as an intermediary substance between the fluorescent material molecules. The liquid crystal molecules surround and isolate the fluorescent material molecules, preventing their aggregation while maintaining the solid state structure. This mediator approach resolves the ACQ effect by keeping fluorescent molecules dispersed without requiring them to be in solution, thus maintaining high fluorescence brightness and stability.
2Adaptability or versatility
If holographic technology is combined with fluorescent display technology, then anti-counterfeiting performance is improved, but material compatibility and image quality are compromised
Solution Approach 1:
The patent creates a composite photopolymer material system comprising four key components: fluorescent material, liquid crystal, photoinitiator, and photopolymerizable monomer. This composite formulation allows both holographic grating formation and fluorescent display functionality to coexist. The liquid crystal component serves dual purposes: it enables holographic recording through refractive index modulation and simultaneously prevents fluorescent material aggregation, thus maintaining high image quality for both holographic and fluorescent images.
3Adaptability or versatility
If fluorescent material is added to photopolymer system, then dual image storage capability is improved, but holographic image brightness is compromised
Solution Approach 1:
The patent optimizes the concentration parameters of fluorescent material and liquid crystal in the photopolymer system to achieve balanced performance. By controlling the weight ratios (fluorescent material: 0.1-10%, liquid crystal: 10-50%), the formulation ensures sufficient fluorescent display capability while maintaining adequate holographic image brightness. The parameter optimization allows both functions to coexist without one compromising the other.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables high brightness and contrast for the fluorescent pattern while maintaining the integrity of the holographic image, enhancing the security and monopoly of anti-counterfeiting technology by allowing independent coexistence and storage of dual images.
Implementation Method 1
selective photoreaction of 1 to 50 parts by weight of an organic fluorescent material, 7 to 50 parts by weight of liquid crystal, 0.2 to 10 parts by weight of a photoinitiator and 33 to 67 parts by weight of photopolymerizable monomers
Implementation Method 2
a fluorescent pattern is presented under ultraviolet light
Data Source
AI summary
The disclosure belongs to the technical field of photopolymer materials, and more particularly relates to a dual image storage material as well as a preparation method and application thereof. The dual image storage material is obtained by selective photoreaction of 1 to 50 parts by weight of an organic fluorescent material, 7 to 50 parts by weight of liquid crystal, 0.2 to 10 parts by weight of a photoinitiator and 33 to 67 parts by weight of photopolymerizable monomers. The obtained dual image storage material can present a high-brightness holographic pattern under sunlight and a fluorescent pattern under ultraviolet light in the same spatial position. The presented holographic and fluorescent patterns may be the same or different. The obtained dual image storage material can be used in the field of optical anti-counterfeiting, optical information storage, displays or the like.