Luminescent Composition Combining IR and UV Excitation
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Solution Overview
Problem
Current luminescent compositions that utilize lanthanide ions for marking substances lack versatility in excitation wavelengths and emission spectra, limiting their application in detection and authentication systems.
Innovation Solution
A novel luminescent composition comprising an IR-excitable component, primarily an oxide or oxysulfide of yttrium with dopants, and a UV-excitable component, such as an aluminate, allowing for distinct excitation and emission properties, enabling enhanced authentication and detection through unique emission spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single luminescent component is used, then the composition is simple, but the excitation wavelength range and emission spectrum versatility are limited
Solution Approach 1:
The patent combines multiple luminescent components with different excitation characteristics into a single composition. Component (a) responds to IR radiation while component (b) responds to UV radiation, creating a composite material that exhibits multiple excitation wavelengths and emission spectra simultaneously, thereby resolving the contradiction between versatility and complexity
Solution Approach 2:
The luminescent composition is designed to perform multiple functions by incorporating components that respond to different excitation sources. The same composition can be excited by both IR and UV radiation, producing distinct emission spectra, making it a universal luminescent material applicable in various detection and authentication systems
2Measurement precision
If luminescent intensity is increased through higher dopant concentrations, then sensitivity improves, but the composition complexity and manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes dopant concentrations within specific ranges (e.g., 0.1-5 mol%) to achieve high luminescence intensity while maintaining manufacturability. By carefully selecting and controlling dopant amounts, the composition achieves enhanced detection sensitivity without requiring extreme manufacturing precision, resolving the contradiction between sensitivity and manufacturing complexity
Data Source
AI summary
The invention relates to a luminescent composition containing a component that can be excited by infrared (IR) radiation and a component that can be excited by ultraviolet (UV) radiation. The composition has a characteristic emission spectrum and can optionally be used along with a reading system that is adjusted to the emission spectrum in order to mark substances or substance mixtures.