Synthesis of spherical Y2O3:Er emitting particles with variable radial composition by controlled double-jet precipitation of layered precursors--颗粒学报PARTICUOLOGY

Aleshin, D. K., Mashkovtsev, M. A., Kosykh, A. S., Kuznetsova, Y. A., Zatsepin, A. F., & Rychkov, V. N. (2023). Synthesis of spherical Y2O3:Er emitting particles with variable radial composition by controlled double-jet precipitation of layered precursors. Particuology, 74, 92-102. https://doi.org/10.1016/j.partic.2022.05.013

Synthesis of spherical Y₂O₃:Er emitting particles with variable radial composition by controlled double-jet precipitation of layered precursors

Danil K. Aleshin ^*, Maxim A. Mashkovtsev, Anastasiya S. Kosykh, Yulia A. Kuznetsova, Anatoly F. Zatsepin, Vladimir N. Rychkov

Institute of Physics and Technology, Ural Federal University, 19 Mira Str., 620002, Yekaterinburg, Russia

10.1016/j.partic.2022.05.013

Volume 74, March 2023, Pages 92-102

Received 14 December 2021, Revised 19 May 2022, Accepted 27 May 2022, Available online 9 June 2022, Version of Record 22 June 2022.

E-mail: danil.aleshin@urfu.ru

Highlights

• Co-precipitation pH affects properties of layered rare earth hydroxides (LRH).

• Spherical assemblies of LRH sheets grow only at pH 8.

• Particles with a Y-enriched "core" and an Er-enriched "shell" are grown.

• Emitting spherical Y₂O₃:Er particles with a variable radial composition are formed.

Abstract

Spherical (Y_0.98Er₀_.02)₂(OH)₅(NO₃)·xH₂O particles were synthesized by controlled double-jet precipitation, with a "core" of pure layered yttrium hydroxide nitrate, and a "shell" of co-precipitated yttrium-erbium layered hydroxide nitrates. With an increase in precipitation pH from 7 to 9.5, the size of layered "building units" decreases and the architecture of their assemblies changes from flower-like through network-like spherical to irregular agglomerates. From there, spherical particles gradually increase their diameter due to the continuous uniform growth of curved layered sheets on their surface. It was established that such growth behavior and network-like architecture of spherical particles was retained even when yttrium was replaced by erbium ions in the layered host lattice during the formation of an Er-enriched "shell". Analysis of SEM, EDS, XPS, photoluminescence spectra and concentration quenching effects of heat-treated Y₂O₃:Er (2 at.%) particles indicate that the radial distribution of erbium in particles is most controllable in a narrow pH range of co-precipitation of layered precursors (pH 8). Вy widely varying the elemental composition of "building units" during co-precipitation, one can simultaneously finely control the composition of layered hydroxides in the radial direction of the spherical particles and grow multicomponent "multi-shell" powders with desired properties.

Graphical abstract

Keywords

Layered hydroxides; Erbium; Controlled precipitation; Emitting particles; Photoluminescence; Concentration quenching

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