Upconverting nanoparticles
= Upconverting nanoparticles
{wiki=Upconverting_nanoparticles}
Upconverting nanoparticles (UCNPs) are a class of luminescent nanomaterials that have the unique ability to absorb near-infrared (NIR) light and emit visible light through a process known as upconversion. This phenomenon is generally observed in materials that contain specific lanthanide ions, such as yttrium, ytterbium, and erbium.