Tuning Luminescence of Lanthanide-Doped Upconversion Nanoparticles through Simultaneous Binary Cation Exchange

Area of Science:

• Materials Science
• Nanotechnology
• Optics

Background:

• Dual-mode luminescent nanomaterials are crucial for advanced applications like biosensing and anticounterfeiting.
• Lanthanide-doped nanoparticles (NPs) offer unique optical properties but require precise control for dual-mode functionality.

Purpose of the Study:

• To tune the optical attributes of lanthanide-doped NPs through simultaneous binary cation exchange.
• To achieve dual-mode luminescence (upconversion and downshifting) in a single nanoparticle system.

Main Methods:

• Simultaneous binary cation exchange on NaYF4:Yb/Er@NaLnF4 core@shell nanoparticles.
• Introduction of Ce3+ and Tb3+ ions to modify luminescence properties.
• Excitation at 980 nm for upconversion and 254 nm for downshifting.

Main Results:

• The engineered NPs exhibited both upconversion and downshifting emissions.
• Tb3+ ions helped maintain the structural integrity of the core@shell NPs during cation exchange.
• Upconversion emission color was tunable (green to red and blue) by altering core lanthanide combinations.

Conclusions:

• Simultaneous binary cation exchange is an effective strategy for optical tuning of lanthanide-doped NPs.
• This work provides a platform for developing dual-mode luminescent materials for biosensing and anticounterfeiting.
• The study also offers insights into the reactivity of different lanthanides during cation exchange.