Dual-Light-Emitting Material for UV-Resistant Optical Encryption
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Solution Overview
Problem
Conventional optical encryption technologies using phosphorescent and fluorescent compositions are vulnerable to exposure by ultraviolet irradiation and can be cracked by high-performance computers, compromising information security.
Innovation Solution
A dual-light-emitting material is developed, comprising a porous framework with a metal ion and organic ligand for room-temperature organic phosphorescence and perovskite nanocrystals for fluorescence, integrated into a three-dimensional encryption cube with fluorescent and phosphorescent filaments, enhancing security through position and angle-dependent information variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phosphorescent and fluorescent compositions are used for optical encryption, then the encryption can be implemented with simple materials, but the security is compromised because the patterns can be exposed by ultraviolet irradiation and cracked by high-performance computers
Solution Approach 1:
The patent employs a composite material system comprising phosphorescent nanocrystals embedded in a fluorescent polymer matrix. This composite structure combines the long afterglow properties of phosphorescent materials with the bright fluorescence of the polymer, creating a dual-mode encryption system that is resistant to both UV exposure and computational cracking, thereby resolving the security vulnerability of conventional single-material systems
Solution Approach 2:
The patent implements a nested structure where phosphorescent nanocrystals are embedded within the fluorescent polymer matrix. This nested configuration allows the phosphorescent cores to provide secure long-duration afterglow encryption while the fluorescent polymer shell provides additional security layers and structural stability, making the encryption system resistant to both physical and computational attacks
2Ease of operation
If phosphorescent composition is printed first and fluorescent composition is printed thereon, then the layering structure is simple, but the patterns cannot be distinguished under ultraviolet luminescence because both compositions emit light at substantially the same color and intensity
Solution Approach 1:
The patent applies local quality by creating distinct luminescence characteristics in different regions of the encryption pattern. The phosphorescent nanocrystals embedded in the fluorescent polymer matrix exhibit different afterglow durations and intensities compared to the surrounding fluorescent polymer, enabling clear pattern distinction under ultraviolet irradiation while maintaining a simple layered structure
Solution Approach 2:
The patent utilizes color changes by exploiting the different emission characteristics of phosphorescent and fluorescent materials. The phosphorescent nanocrystals emit light with different temporal and spectral properties compared to the fluorescent polymer matrix, creating distinguishable color patterns under ultraviolet luminescence that reveal the encrypted information
3Reliability
If the fluorescent composition layer stops luminescence after ultraviolet dissipation, then the phosphorescent patterns become visible, but the security is weakened because the information can be captured during the brief phosphorescent emission period
Solution Approach 1:
The patent implements periodic action through the sequential luminescence behavior of fluorescent and phosphorescent components. The fluorescent polymer provides initial bright emission upon UV irradiation, followed by the phosphorescent nanocrystals providing sustained afterglow emission after UV dissipation. This periodic luminescence pattern creates multiple phases for information encoding, making it difficult to capture complete information in a single photograph and thereby enhancing security
Solution Approach 2:
The patent applies preliminary action by having the fluorescent polymer matrix emit light first upon UV irradiation, which serves as a preliminary signal that masks the phosphorescent pattern during the initial exposure phase. Only after this preliminary fluorescent emission diminishes does the phosphorescent afterglow become prominent, creating a time-gated information release that prevents easy capture of the encrypted pattern
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 dual-light-emitting material provides robust security by concealing real information within fake information, resistant to cracking by high-performance computers, with the three-dimensional pattern structure offering increased security through luminescence stability and distinct information display based on position and angle of view.
Implementation Method 1
room-temperature organic phosphorescence (RT-OP), which originates from the radiation transition of excitons from the triplet excitation state to the ground state
Implementation Method 2
fluorescent material and a real ink made of a duel-light-emitting material that is both fluorescent and phosphorescent
Data Source
AI summary
Proposed is a dual-light-emitting material that includes a porous framework composed of a metal ion and an organic ligand, an insert body placed in a cavity of the porous framework, and a nanocrystal containing the metal ion of the porous framework, wherein the organic ligand is configured to emit room-temperature organic phosphorescence (RT-OP) and the nanocrystal is configured to emit fluorescence.