Luminescent Medium With Concentration Gradients For Anti-Counterfeiting
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Solution Overview
Problem
Current luminescent media used for counterfeiting prevention emit visible lights of different colors when irradiated with invisible light, which can be easily analyzed, necessitating a more complex analysis of light emissions to enhance security.
Innovation Solution
A luminescent medium comprising a substrate with a first and second luminescent material that emit infrared or ultraviolet lights of different wavelength ranges, where the materials are disposed in overlapping planar areas with concentration gradients, requiring a method to read these emissions using infrared or ultraviolet detection sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a luminescent medium uses a single type of luminescent material emitting visible light of different colors, then the medium can be easily read and identified, but the counterfeiting prevention effect is insufficient because the light emission can be easily analyzed
Solution Approach 1:
The luminescent medium is segmented into multiple distinct luminescent materials (first and second luminescent materials) with different emission characteristics. Each material emits light in different wavelength ranges (visible, infrared, or ultraviolet), creating a segmented light emission profile that is more difficult to counterfeit and analyze than a single-material system.
Solution Approach 2:
The patent extends the light emission analysis from a single visible dimension to multiple dimensional ranges including infrared and ultraviolet. By utilizing overlapping planar areas where different luminescent materials are disposed, the system creates a multi-dimensional light emission signature that requires sophisticated analysis equipment and methods, thereby enhancing counterfeiting prevention.
2Reliability
If multiple luminescent materials are used in overlapping areas with concentration gradients, then the light emission analysis becomes more complex and secure, but the manufacturing precision requirements increase
Solution Approach 1:
The luminescent medium implements local quality variations through concentration gradients of the first and second luminescent materials in their overlapping planar areas. The concentration of each material varies spatially, creating localized differences in light emission intensity and characteristics. This local quality control enhances security by making the light emission pattern unique and difficult to replicate, while the gradient structure provides a systematic approach to manufacturing.
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 luminescent medium provides a higher level of counterfeiting prevention by requiring more complex analysis of light emissions, with the concentration gradients in the luminescent materials making it difficult to analyze the emitted lights, thereby enhancing security features.
Implementation Method 1
a first luminescent material which, when irradiated with visible light, infrared light or ultraviolet light, emits first infrared light having a first wavelength range
Implementation Method 2
a second luminescent material which, when irradiated with visible light, infrared light or ultraviolet light, emits second infrared light having a second wavelength range
Implementation Method 3
a first luminescent material which, when irradiated with visible light or ultraviolet light, emits first ultraviolet light having a first wavelength range
Implementation Method 4
a second luminescent material which, when irradiated with visible light or ultraviolet light, emits second ultraviolet light having a second wavelength range
Data Source
AI summary
There is provided a luminescent medium which requires difficult analysis of light emitted from a luminescent material of the medium. A luminescent medium includes a substrate, and a luminescent material comprising a first luminescent material which, when irradiated with visible light, infrared light or ultraviolet light, emits first infrared light “a”, and a second luminescent material which, when irradiated with visible light, infrared light or ultraviolet light, emits second infrared light “b”. The first luminescent material is formed in a first planar area, and the second luminescent material is formed in a second planar area. The first planar area and the second planar area overlap each other, forming an overlapping planar area in which the luminescent materials each have a concentration gradation.