Lanthanide Nanocrystals: Colloidal Tm³⁺/Yb³⁺‐Doped LiYF₄ Nanocrystals: Multiple Luminescence Spanning the UV to NIR Regions via Low‐Energy Excitation (Adv. Mater. 40/2009)

LiYF4 nanoparticles co-doped with thulium and ytterbium ions show multiple emissions in the region covering the ultraviolet to the near-infrared following excitation with low-energy radiation via a multiphoton process known as upconversion, in work reported by John Capobianco and co-workers on p. 4025. These versatile diamond-shaped nanoparticles have been identified as candidates for potential integration in various applications including cell labeling and imaging, solution-based fast scintillation, as well as anti-counterfeiting.