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 …

… upconversion luminescence of upconverting nanoparticles (UCNPs). (a) Schematic overview
of main strategies for enhancing upconversion … synergistic upconversion luminescence …

… In addition, nanoparticles are known to possess high surface … of lanthanides and of
upconverting nanoparticles. … upconverting nanoparticles (UCNPs) doped with lanthanide ions. …

… Materials Displaying Luminescence Upconversion Upconverting nanoparticles (UCNPs)
most often are composed of a host crystal (usually fluorides, oxides, phosphates, or sulfides of …

… The advent of upconverting nanoparticles (UCNPs) has made it possible to overcome this
crucial challenge. UCNPs can convert near-infrared (NIR) radiation, which can penetrate …

… Lanthanide-doped upconversion nanoparticles capable of … for excitation of these nanoparticles
is nondestructive and highly … emerging classes of upconversion nanoparticles that have …

… b) Near-infrared (NIR) light passes through tissue and excites upconverting nanoparticles
(UCNPs). UCNPs convert NIR light to UV or visible light, which can trigger photoreactions of …

… and biocompatibility, upconversion nanoparticles can be … In addition, intense visible emission
from these nanoparticles … -imaging involving upconversion nanoparticles, simultaneously …

… This section describes the various nanochemistry approaches utilized to produce upconversion
nanoparticles in a highly controlled manner. A range of synthetic approaches such as …

… Significant advances in the analysis and theoretical modeling of upconverting nanoparticles
(… The ET pathways that drive photon upconversion can be tuned by varying the combination …