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

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 51; no. 14; pp. 5448 - 5456
• Main Authors: Ermakova, Yu A, Pominova, D V, Voronov, V V, Yapryntsev, A D, Ivanov, V K, N Yu Tabachkova, Fedorov, P P, Kuznetsov, S V
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 05.04.2022
• Subjects: Aqueous solutions; Ceramic powders; Ceramics industry; Chemical composition; Chemical precipitation; Coprecipitation; Crystal structure; Erbium; Fluorides; Fluorination; Luminescence; Potassium; Potassium fluoride; Precursors; Sintering (powder metallurgy); Sodium fluoride; Solid solutions; Strontium fluorides; Upconversion; X-ray diffraction; Ytterbium
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d2dt00304j

The major challenge in optical ceramic technology is the quality of the starting precursor powder for pressing, which is a key element in the optical ceramic industry. One express and helpful technique for the estimation of powder quality is the estimation of the quantum yield of up-conversion luminescence; therefore precursor powders must exhibit high values of up-conversion luminescence efficiency. Single-phase solid solutions based on strontium fluoride doped with ytterbium and erbium were synthesised by co-precipitation from aqueous solutions using sodium fluoride, potassium fluoride and ammonium fluoride as fluorinating agents. The asymmetry of X-ray diffraction maxima indicated the presence of two populations of particles with the same chemical composition. The processes of extended flat particles’ growth from smaller particles with a spherical morphology were revealed with transmission electron microscopy and X-ray diffraction. It was shown that when sodium fluoride and potassium fluoride were used they entered the crystal structure in an amount of 3–4 mol% and 1 mol%, respectively. The introduction of sodium and potassium led to an improvement in the sintering ability of particles and a significant increase in the particle size in ceramics by a factor of 5 and 2, respectively, in comparison with the use of ammonium fluoride. The quantum yield values of up-conversion luminescence at the level of tenths of a percent at a low pump power density of 0.1 W cm−2 were very high, which suggests that these synthetic techniques can be considered to be promising for the preparation of precursors of laser ceramics.