Luminescence-based techniques continue to attract considerable attention due not only to
their current range of applications but also to their wide potential in the fields of optical …

Luminescent materials, also called phosphors, are defined as solids that can absorb and
convert certain types of energy into radiation of light.(1) Among all kinds of phosphors, rare …

Upconversion nanoparticles (UCNPs) show attractive anti-Stokes characteristics converting
lower-energy photons into higher-energy emissions. The excellent biocompatibility and …

Lanthanide-doped upconverting nanoparticles (UCNPs) have recently attracted enormous
attention in the field of biological imaging owing to their unique optical properties:(1) efficient …

The applications of lanthanide-doped upconversionnanocrystals in biological imaging,
photonics, photovoltaics and therapeutics have fuelled a growing demand for rational …

We report the synthesis of luminescent crystals based on hexagonal-phase NaYF4
upconversion microrods. The synthetic procedure involves an epitaxial end-on growth of …

Photon upconversion in rare earth activated phosphors involves multiple mechanisms of
electronic transitions. Stepwise optical excitation, energy transfer, and various nonlinear and …

Probing the nature of nanocrystalline materials such as the surface state, crystal structure,
morphology, composition, optical and magnetic characteristics is a crucial step in …

Lanthanide-doped upconversion nanoparticles (UCNPs) have recently attracted great
attention in theranostics due to their exceptional optical and physicochemical properties …