Lanthanide-Based Molecular Cluster-Aggregates: Optical Barcoding and White-Light Emission with Nanosized {Ln₂₀ }...

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Counterfeit goods pose significant economic and security risks globally.
• Optical anti-counterfeiting technologies are crucial for product and document authenticity.
• Existing solutions include molecular species, metal-organic frameworks (MOFs), and nanoparticles.

Purpose of the Study:

• To explore molecular cluster-aggregates (MCAs) as optical barcodes for anti-counterfeiting.
• To demonstrate the control of optical properties through MCA composition and energy transfer.
• To investigate the potential for high-security optical labeling with precise read-out.

Main Methods:

• Synthesis and characterization of specific lanthanide-based MCAs, [Ln20(chp)30(CO3)12(NO3)6(H2O)6].
• Controlled doping with Gadolinium(III), Terbium(III), and Europium(III) ions.
• Analysis of luminescent properties and emission color tuning.

Main Results:

• Demonstrated tuneable optical properties of MCAs by controlling composition.
• Achieved high-security optical labeling with precise emission color output.
• Developed a tri-doped MCA exhibiting white-light emission through GdIII, TbIII, and EuIII doping.

Conclusions:

• MCAs offer a novel platform for advanced optical anti-counterfeiting solutions.
• Composition control is a powerful tool for fine-tuning luminescent properties in nanosized materials.
• This methodology provides a unique approach to understanding luminescence in molecular cluster-aggregates.