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Encoding Multilayer Complexity in Anti-Counterfeiting Heterometallic MOF-Based Optical Tags
Jacob I Deneff1, Kimberly S Butler2, Lauren E S Rohwer3
1Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, NM, 87185, USA.
Angewandte Chemie (International Ed. in English)
|November 2, 2020
Summary
Researchers developed advanced optical tags using rare-earth metal-organic frameworks. These tags offer both visible and near-infrared (NIR) properties for secure, multi-layered asset identification.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Current optical tags lack tunable properties for complex encoding.
- Need for advanced security features in asset identification.
Purpose of the Study:
- To design a novel strategy for creating complex, secure optical tags.
- To develop heterometallic rare-earth metal-organic frameworks with tunable photophysical properties.
Main Methods:
- Utilized a design strategy based on nonanuclear clusters in metal-organic frameworks.
- Incorporated synergistic approaches for overt (visible) and covert (near-infrared, NIR) properties.
- Investigated compositional changes and their effect on intermetallic energy transfer.
Main Results:
- Achieved multi-emissive spectra and tunable luminescence lifetimes.
- Demonstrated the encoding of multilayer complexity in a single material.
- Validated tag authentication using orthogonal detection methodologies.
Conclusions:
- The developed strategy enables the creation of highly complex, difficult-to-counterfeit optical tags.
- Subtle compositional changes significantly influence photophysical properties.
- This approach can generate a large library of advanced security tags.
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