Temperature sensing performance based on up-conversion luminescence in hydrothermally synthesized Yb³⁺/Er³⁺ co-doped NaScF₄ phosphors

Abstract

NaScF4:Yb3+/Er3+ crystals were successfully hydrothermally synthesized using distilled water as a single solvent.

Voltage‐ and Power‐Conversion Performance of Bi‐functional ZrO2 : Er3+/ Yb3+ Assisted and Co‐sensitized Dye Sensitized Solar Cells for Internet of Things Applications

“…The evaluated slope values for all compounds confirm that almost two photons are involved in UC progression. The resulting ‘ n ’ values are comparable to earlier reports [59,60,74–76] …”

Tuning the Red-to-Green-Upconversion Luminescence Intensity Ratio of Na3ScF6: 20% Yb3+, 2% Er3+ Particles by Changes in Size

“…Sc, as a special rare earth element different from other lanthanide elements, has a unique electronic configuration and a smaller ionic radius (0.83 Å) such that it can more easily produce red-upconversion luminescence, and so people began to turn to Sc 3+ as a matrix in materials research. Therefore, in recent years there has been an increasing amount of research on NaScF 4 nanocrystals co-doped with Yb 3+ and Er 3+ , which can readily produce red-upconversion luminescence [ 2 , 5 , 25 , 26 , 27 , 28 , 29 , 30 ]. Min Pang et al directly synthesized water-soluble hexagonal NaScF 4 : Yb 3+ /Er 3+ nanocrystals with strong red-upconversion luminescence by a hydrothermal method; afterwards, an active shell layer containing Yb 3+ was wrapped around the NaScF 4 : Yb 3+ , Er 3+ core nanocrystals, which further increased the intensity of the upconversion luminescence by a factor of 6.8 [ 6 ].…”

KYb2F7:Er3+ based nanothermometers: controlled synthesis, enhanced red emission, and improved sensitivities via crystal-site engineering

“…For the KYb 1.8 Ge 0.15 F 7 : Er 3+ (2 mol%) nanocrystals, even though with a lower S A (0.0020 K À1 at 513 K), the S R value has been highly enhanced to 1158.0/T 2 , which is only 978.8/T 2 for the KYb 2 F 7 :Er 3+ (2 mol%) nanocrystals. The optimal S R values obtained in the current study are higher than different host materials, 52,53,55,[91][92][93][94][95][96] as shown in the Table 1. In comparison to KYb 2 F 7 :Er 3+ (2 mol%), the KYb 1.8 Ca 0.3 F 7 :Er 3+ (2 mol%) nanocrystal thermometer shows quite similar S A values at temperature range of 233-513 K. On the other hand, the S R values also have a more or less similar trend as compared to the KYb 2 F 7 :Er 3+ (2 mol%) nanocrystals.…”