Elucidating the role of energy management in making brighter, and more colorful upconversion nanoparticles

Upconversion nanoparticles (UCNPs) represent a class of optical nanomaterials that can convert low-energy excitation photons to high-energy fluorescence emissions. Despite great progress, spectral profiles of lanthanide-doped UCNPs are still limited by several intrinsic issues: weak absorption cross-sections, fixed emission wavelengths, low quantum yield, etc. In recent years, it has been witnessed great achievements in engineering spectral...