Synthesis and characterization of LiLuF₄:Er³⁺ and LiLuF₄:Yb³⁺,Er³⁺ exhibiting upconversion fluorescence pumped by a 1560 nm laser

Abstract

The UC emission at ∼1 μm could be enhanced by doping Yb3+ ions in LiLuF4:Er microcrystals under 1560 nm excitation.

Near‐Infrared Ratiometric Nanothermometer in Yb3+/Nd3+ Co‐Doped Nanocrystals

“…Past reports suggest 12] that the LiLuF 4 nanocomposite belongs to a tetragonal structure, which has single site S4 symmetry for all trivalent lanthanide metal ions. What is more, the doping of Yb 3+ and Nd 3+ affect the lattice parameters of LiLuF 4 microcrystals [13] . This leads to the appearance of some miscellaneous peaks, and a few diffraction peaks of LiLuF 4 :Yb, Nd are slightly offset.…”

“…What is more, the doping of Yb 3 + and Nd 3 + affect the lattice parameters of LiLuF 4 microcrystals. [13] This leads to the appearance of some miscellaneous peaks, and a few diffraction peaks of LiLuF 4 :Yb, Nd are slightly offset.…”

NaYS2:Er3+ - a highly efficient NIR II response multi-photon up-conversion phosphor

“…Er 3+ has a well spectral response around 1530 nm with a relative large absorption cross-section, but it is not suitable for sensitizer owing to the lacking of the matchable activator. Actually, a number of the literatures has announced Er 3+ doped UC materials pumping around 1530 nm realized via the excited state absorption process of Er 3+ ions themselves [32][33][34][35][36][37][38][39][40] . Disappointedly, their up-conversion quantum yields (UCQY) are extremely low, less than 0.5%, limited by the deleterious quenching interactions, and strong electron-phonon coupling etc.…”