Energy Manipulation in Lanthanide-Doped Core-Shell Nanoparticles for Tunable Dual-Mode Luminescence toward Advanced...

Area of Science:

• Materials Science
• Nanotechnology
• Photonics

Background:

• Developing advanced luminescent materials is crucial for anti-counterfeiting technologies but presents significant challenges.
• Existing methods often struggle with efficiency and color tunability for dual-mode luminescence.

Purpose of the Study:

• To report a novel and efficient approach for achieving dual-mode luminescence with tunable color outputs.
• To explore the potential of these materials in anti-counterfeiting applications.

Main Methods:

• Utilized a core-shell nanostructuring strategy with Gadolinium(III) (Gd³⁺)-mediated interfacial energy transfer and Cerium(III) (Ce³⁺)-assisted cross-relaxation.
• Synthesized NaGdF₄:Yb/Ho/Ce@NaYF₄:X (X = Eu, Tb, Sm, Dy) core-shell nanostructures.
• Investigated dual-mode emissions under ultraviolet (254 nm) and near-infrared (980 nm) excitation.

Main Results:

• Achieved efficient and multicolor-tunable dual-mode emissions from the core-shell nanostructures.
• Demonstrated the suppression of adverse cross-relaxation processes through spatial separation in the nanoarchitecture.
• Successfully created 2D-encoded patterns using the dual-mode emitting nanomaterials.

Conclusions:

• The developed core-shell nanostructures offer a promising platform for advanced anti-counterfeiting solutions.
• This strategy advances the development of fluorescent materials for anti-counterfeiting and optical multiplexing.