Effect of the fluorinating agent type (NH₄F, NaF, KF) on the particle size and emission properties of SrF₂:Yb:Er luminophores

Abstract

Single-phase powders of SrF2:Yb:Er solid solutions with different particle sizes were synthesized using different fluorinating agents ammonium fluoride, sodium fluoride and potassium fluoride under the same synthesis conditions by co-precipitation...

Luminescent/Temperature-Sensing Properties of Multifunctional Rare-Earth Upconversion Kevlar Nanofiber Composite under 1550 nm

“…The luminescent characteristics of UCNPs exhibit variations based on the presence of different doping ions. In Figure 1a, all spectral lines exhibit prominent emission peaks at 525 nm, 545 nm, 655 nm, and 810 nm, which correspond to transitions between energy levels 2 H 11/2 -4 I 15/2 , 4 S 3/2 -4 I 15/2 , 4 F 9/2 -4 I 15/2 , and 4 I 9/2 -4 I 15/2 [30]. In the case of NaYF 4 : Er (5-80 mol%) @NaYF 4 , the intensity of green light (525 nm and 540 nm) surpasses that of red light (655 nm) and near-infrared light (810 nm) when Er 3+ content is low (5-12.5 mol%).…”