Multi-color luminescence and anticounterfeiting application of upconversion nanoparticle

Area of Science:

• Materials Science
• Nanotechnology
• Photonics

Background:

• Multi-color luminescence materials are crucial for advanced technologies like displays and anticounterfeiting.
• Existing materials often rely on single sensitizers, limiting color tunability.

Purpose of the Study:

• To design a novel core-shell upconversion nanoparticle (UCNP) for tunable multi-color luminescence.
• To achieve bright-white and flexible full-color emission using a single near-infrared excitation laser.

Main Methods:

• Fabrication of a core-shell NaYF4 nanoparticle structure.
• Doping with lanthanide ions (Nd3+, Yb3+, Tm3+, Er3+) for luminescence control.
• Utilizing a single 980 nm continuous-wave laser excitation.

Main Results:

• Achieved tunable luminescence from red to green, cyan, and blue, including bright-white emission.
• Demonstrated control over emission color and brightness by adjusting sensitizer doping and core-shell structure.
• Observed emission color changes with excitation light intensity and wavelength.

Conclusions:

• The novel core-shell UCNP material enables versatile multi-color luminescence under a single NIR excitation.
• The bright-white emission is suitable for lighting and display applications.
• Flexible full-color emission holds potential for anticounterfeiting and information storage.