Upconversion (UC) refers to nonlinear optical processes in which the sequential absorption
of two or more photons leads to the emission of light at shorter wavelength than the …

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 refers to non-linear optical processes that convert two or more low-energy
pump photons to a higher-energy output photon. After being recognized in the mid-1960s …

Photon-upconverting nanoparticles (UCNPs) can be excited by near-infrared light and emit
visible light (anti-Stokes emission) which prevents autofluorescence and light scattering of …

Upconverting materials are capable of absorbing near‐infrared light and converting it into
short‐wavelength luminescence. The efficiency of this remarkable effect is highly …

This feature article highlights the recent advances on the chemical synthesis, surface
modification and applications of rare earth fluoride nano-/microcrysals. In the past decade …

New generation fluorophores, also termed upconversion nanoparticles (UCNPs), have the
ability to convert near infrared radiations with lower energy into visible radiations with higher …

Abstract Lanthanides (Ln 3+) are a unique class of optical materials and are extensively
used as building blocks for optoelectronic device architectures due to their outstanding …

The strong upconversion luminescence (UCL) of upconversion nanoparticles (UCNPs)
endows the nanoparticles with attractive features for combined imaging and drug delivery …

Upconversion control: Applying a relatively low bias voltage to an epitaxial lanthanide‐
doped BaTiO 3 thin film results in a significant enhancement of the upconversion emission …