Triple-Mode upconversion emission for dynamic multicolor luminescent anti-Counterfeiting.

Area of Science:

• Materials Science
• Nanotechnology
• Optics

Background:

• Lanthanide (Ln³⁺) luminescent materials are vital for information security due to unique optical properties.
• Dynamic colorful luminescent nanomaterials offer advanced information encryption capabilities.

Purpose of the Study:

• To demonstrate triple-mode stimuli-responsive emission color modulation in lanthanide-doped nanostructured materials.
• To explore the potential of these materials for anti-counterfeiting applications.

Main Methods:

• Fabrication of lanthanide-doped fluoride core-shell nanostructures.
• Modulation of Ln³⁺ composition and doping concentrations to control emission colors.
• Investigation of stimuli-responsive properties (thermal, optical wavelength, excitation power).

Main Results:

• Demonstrated superior triple-mode stimuli-responsive emission color modulation.
• Achieved excitation wavelength/power-dependent and temperature-dependent color variations (298 K to 437 K).
• Reported a relative sensitivity (Sr) of 1.1387% K⁻¹ at 398 K.

Conclusions:

• Developed a universal strategy for manipulating triple-mode stimuli-responsive dynamic luminescence.
• Highlighted the excellent optical and structural stability of the luminescent nanoparticles.
• Confirmed the significant potential of these nanomaterials for anti-counterfeiting applications.