The impact of Yb³⁺ concentration on multiband upconversion in a single NaYF₄:Yb/Er microcrystal determined via nanosecond time-resolved spectroscopy

Abstract

In lanthanide-sensitized upconversion (UC) nanomaterials, the typical sensitizer Yb3+ can significantly modulate the codoped activator (such as Er3+ ions) to generate multiband transitions. However, the kinetics of these multiband emissions...

Gd–Er interaction promotes NaGdF4:Yb, Er as a new candidate for high-power density applications

“…Unlike cw excitation, which needs long acquisition times, up to hundreds of ms pixel dwell time 31 and suffers from local heating effects, 2,3,14,[16][17][18][19][20] pulsed laser excitation allows for attaining higher equivalent power densities without heating the sample. 32 Furthermore, combined with time-gated luminescence detection, pulsed laser excitation improves contrast visualization. 33 Both advantages are crucial for the fast and safe acquisition of emission from higher photon order upconversion processes.…”

The effect of Er3+ concentration on the kinetics of multiband upconversion in NaYF4:Yb/Er microcrystals

“…High irradiation power density conditions allow the highly doped β-NaYF 4 :Yb 3+ /Er 3+ MCs to exhibit stronger emissions. Huang et al achieved nearly white luminescence in a single β-NaYbF 4 : Er 3+ (2 mol%) MC; they studied the effect of Yb 3+ ion doping concentration on UC kinetics (Huang et al, 2022b). For the UC system, the Yb 3+ ion is the absorption antenna of the photon, and the Er 3+ ion is the luminescence center of the MCs.…”

Upconversion enhancement through engineering the local crystal field in Yb3+ and Er3+ codoped BaWO4 along with excellent temperature sensing performance

“…Up to now, fluorides are the most commonly used matrixes for UC studies in the previous literature reports, especially hexagonal NaYF 4 and NaLuF 4 , which are deemed as the optimal UC hosts because of their extremely low phonon energy (∼360 cm −1 ). 3–11…”