Luminescent Particulate Agglomerates for Anti-Forgery Security
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Solution Overview
Problem
Current methods for securing value documents against forgery, such as banknotes, rely on single authenticity features that can be easily counterfeited, and existing combinations of luminescent and magnetic substances do not provide sufficient security against forgery.
Innovation Solution
The use of particulate agglomerates composed of two or more luminescent substances with different emission wavelengths, which are combined to create a statistical correlation in luminescence intensity fluctuations, allowing for enhanced security features that distinguish genuine from counterfeit documents through site-specific measurement and evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple luminescent substances with different emission wavelengths are combined in particulate agglomerates, then security against forgery is significantly increased through statistical correlation of luminescence intensity fluctuations, but the device complexity and measurement evaluation requirements increase
Solution Approach 1:
The patent uses composite particulate agglomerates containing multiple luminescent substances (at least two different luminescent substances A and B) with different emission wavelengths. These composite particles are incorporated into the value document to create a luminescence mixture that exhibits statistical correlation in intensity fluctuations, providing enhanced security against forgery that cannot be achieved with single-substance luminescent features.
Solution Approach 2:
The patent changes the parameter of luminescence emission by using multiple luminescent substances with different emission wavelengths (first emission wavelength for substance A, second emission wavelength for substance B). The measurement system evaluates luminescence intensities at these different wavelengths, and the statistical correlation between intensity fluctuations at these different parameter values provides the security feature.
2Measurement precision
If site-specific measurement and statistical correlation evaluation are implemented, then counterfeit detection accuracy is improved, but the measurement time and processing complexity increase
Solution Approach 1:
The patent performs site-specific measurements at multiple locations within the value document and evaluates statistical correlations between luminescence intensities at these different sites. By measuring at multiple points and evaluating the correlation pattern, the system achieves high counterfeit detection accuracy. The measurement continues until sufficient data points are collected to establish the statistical correlation, balancing accuracy with time efficiency.
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
This approach significantly increases security against forgery by recognizing non-correlating authenticity features as false, even if they share the same band position and intensity, and increases the number of possible codings, thereby enhancing the document's security.
Implementation Method 1
The authenticity assurance of documents of value by means of luminescent substances has been known for a long time. Host lattices doped with rare earth metals are preferably used, it being possible for the absorption and emission ranges to be varied within a wide range by suitably matching the rare earth metal and host lattice.
Implementation Method 2
The luminescent substance is in the form of particles and is surrounded by a shell made of nanoparticles. The properties of the feature substance result from the interaction of the luminescence emission properties of the luminescent substance and the properties of the nanoparticles.
Data Source
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AI summary
The invention relates to a value document having luminescent, particulate agglomerates which each contain at least two different luminescent solid homogeneous phases emitting with a first and a second emission wavelength, wherein, during an evaluation of measured values which can be obtained by a location-specific measurement, carried out at different locations, of the first luminescent intensity at the first emission wavelength and the second luminescent intensity at the second emission wavelength, there is a statistical correlation between the first luminescent intensities and the second luminescent intensities.