Lanthanide-Doped Cs₂ZrCl₆ Perovskite Nanocrystals for Multimode Anti-Counterfeiting Application

Area of Science:

• Materials Science
• Nanotechnology
• Photonic Security

Background:

• Traditional luminescent materials are easily counterfeited due to static emission.
• Advanced anti-counterfeiting technologies are needed to combat rising forgery.
• Multimode luminescent materials offer enhanced security through excitation-dependent emission.

Purpose of the Study:

• To synthesize novel lanthanide-doped Cs2ZrCl6 nanocrystals.
• To investigate their multimode luminescent properties for anti-counterfeiting applications.
• To develop a multi-mode security label based on these nanocrystals.

Main Methods:

• Colloidal synthesis of lanthanide-doped Cs2ZrCl6 nanocrystals via a hot-injection route.
• Characterization of luminescence properties under different excitation wavelengths.
• Fabrication of a triple-mode anti-counterfeiting label.

Main Results:

• Synthesized Cs2ZrCl6 nanocrystals doped with various lanthanides (Tb, Eu, Pr, Sm, Dy, Ho).
• Observed efficient host-to-guest energy transfer from self-trapped excitons (STEs) and characteristic Ln3+ emission.
• Demonstrated excitation-wavelength-dependent emission, enabling different colors under distinct excitation sources.
• Successfully fabricated a triple-mode anti-counterfeiting label.

Conclusions:

• Developed a breakthrough excitation-encoded multimode luminescent platform.
• Lanthanide-doped Cs2ZrCl6 nanocrystals offer high forgery resistance and encoding capacity.
• Potential applications in next-generation photonic security, scintillation detectors, and solid-state lighting.