| Abstract Scope |
The remarkable optomagnetic properties of the lanthanides (Ln) make Ln-based materials ideal for biomedical applications, including diagnostic and therapeutic approaches. This is due the unique electronic properties of the Ln (f-elements) allowing for upconversion and near-infrared emission under near-infrared excitation as well as high magnetic moments. Sodium lanthanide fluorides (NaLnF4) are our favorite materials, and we developed a fast and reliable microwave-assisted synthetic approach allowing crystalline phase and size control in the sub 20 nm realm. Having a fast and reliable synthetic route towards NaLnF4 NPs on hand, we explore various nanoparticle architectures and compositions with the goal to optimize their optomagnetic properties, ultimately resulting in the design of biocompatible multimodal bioprobes. This includes opto-magnetic contrast agents and novel near-infrared emitters based on Pr for nanothermometry in the biological transparency windows, while we also revisit open toxicity questions by assessing nano-bio-interactions as a function of surface chemistry. |