RARE EARTH NANOCRYSTAL FOR HIGHLY EFFICIENT NIR TO NIR WAVELENGTH CONVERSIONS

摘要

Disclosed is a novel composition of matter that provides highly efficient energy conversion from NIR to NIR wavelengths, with either up-, down-, or both up- and down- converting transitions. Disclosed is a composition having the molecular formula N aYF 4 : YbxT myN dz, where 0 ≤ x ≤ 0.98, 0 ≤ y ≤ 0.02, and 0 ≤ z ≤ 0.06. Also disclosed is a core-shell structure, wherein the core is a composition having the molecular formula NaYF 4 : YbxT myN dz, where 0 ≤ x ≤ 0.98, 0 ≤ y ≤ 0.02, and 0 ≤ z ≤ 0.06, and the shell is composition having the molecular formula NaYF4:Ndw, where 0 ≤ w ≤ 0.1.