Synthesis of SrF₂:Yb:Er ceramic precursor powder by co-precipitation from aqueous solution with different fluorinating media: NaF, KF and NH₄F

Abstract

The major challenge in optical ceramics technology is the quality of the starting precursor powder for pressing, which is a key element for the optical ceramics industry. One express and...

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

“…Comparison with previously published studies of the up-conversion luminescence quantum yield of the SrF 2 :Yb:Er solid solutions in the form of both particles and single crystals 1,32,33,38 (Table 3) confirms the observed dependence of the up-conversion luminescence quantum yield on the particle size. The observed differences can be explained by different measurement techniques of the up-conversion luminescence quantum yield.…”

“…Strontium fluoride powders Sr 0.96 Yb 0.02 Er 0.02 F 2.04 , Sr 0.95 Yb 0.03 Er 0.02 F 2.05 and Sr 0.935 Yb 0.050 Er 0.015 F 2.065 were synthesised by the co-precipitation from aqueous solution technique using NaF, KFÁ2H 2 O and NH 4 F as fluorinating agents according to the previously reported protocol. 38 The precursors were Sr(NO 3 ) 2 , Yb(NO 3 ) 3 Á6H 2 O, Er(NO 3 ) 3 Á5H 2 O (99.99%, LANHIT, Russia), NaF (pure, Fluorine Salts Chemical Plant LLC, Russia), KFÁ2H 2 O (pure, Fluorine Salts Chemical Plant LLC, Russia), NH 4 F (pure for chemical analysis, Fluorine Salts Chemical Plant LLC, Russia) and double distilled water. The reactants were used without any additional purification steps.…”

“…Various fluorinating agents (HF, NH 4 F, NaF, KF, NaHF 2 , KHF 2 ) can be used in the synthesis of luminophore powders. [34][35][36] This causes the sodium 37,38 and potassium 38 cations to be incorporated into the crystal lattice of strontium fluoride resulting in changes in the emission properties.…”

“…Ermakova et al reported 38 high values of the up-conversion luminescence energy yield (about 0.5%) at low excitation intensity (0.1 W cm À2 ) for SrF 2 :Yb:Er solid solutions in which sodium and potassium cations were incorporated into the strontium fluoride crystal lattice. However, intensity dependent quantum yield data was not presented in this paper, which did not allow the influence of alkali cations on the up-conversion luminescence to be revealed.…”

Рентгенолюминесценция нанопорошков SrF-=SUB=-2-=/SUB=-: Eu

“…3, а). Область когерентного рассеяния соответствует единичным частицам по данным ПЭМ, что ранее наблюдалось в работе[33]. Изображение ПЭМ образца Sr 0.9 Eu 0.1 F 2.1 после термообработки при 600 • С представлено на pис.…”