Optical materials

Synthesis and study of the luminescent properties of terbium-activated gadolinium tantalum-niobate

G. A. Gusev^a, S. M. Masloboeva^b, M. A. Yagovkina^a, M. V. Zamoryanskaya<sup>a

a</sup> Ioffe Institute, 194021 St. Petersburg, Russia
^b Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials Kola Science Centre of the Russian Academy of Sciences, 184209 Apatity, Russia

Abstract: For the first time, terbium-activated gadolinium tantalo-niobates were synthesized ((Gd$_{1-x}$Tb$_x$)Nb$_y$Ta$_{1-y}$O$_4$). The synthesis was carried out by the liquid-phase method. All studied materials had the main crystalline modification M GdNbO$_4$. The content of impurity phases did not exceed 2–5%. The photo- and cathodoluminescence spectra were studied. Concentration quenching of the terbium ion luminescence for a series of solid solutions containing tantalum ((Gd$_{1-x}$Tb$_x$)Nb$_{0.9}$Ta$_{0.1}$O$_4$) occurs earlier than for pure gadolinium niobates ((Gd$_{1-x}$Tb$_x$)NbO$_4$). The obtained materials are promising for use as scintillators.

Keywords: gadolinium tantalum-niobates, liquid-phase synthesis, Tb$^{3+}$, luminescence, cathodoluminescence.

Received: 23.09.2021
Revised: 23.09.2021
Accepted: 05.10.2021

DOI: 10.21883/OS.2022.02.51998.2759-21

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