Spectroscopy of condensed matter

Defects and energy transfer in Sr$_9$Lu(PO$_4$)$_7$, doped with ions Pr$^{3+}$

E. S. Trofimova^ab, V. A. Pustovarov^a, A. F. Zatsepin<sup>a

a</sup> Ural Federal University, 620002 Ekaterinburg, Russia
^b Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, 119991 Moscow, Russia

Abstract: Luminescent properties of Sr$_9$Lu(PO$_4$)$_7$ crystalline powders doped with Pr$^{3+}$ ions upon excitation in the ultraviolet region of the spectrum are considered. in the temperature range 5–320 K, are considered. In the photoluminescence spectra, an intense glow corresponding to radiative interconfigurational $5d\to4f$-electronic transitions, weak narrow lines of intra-configuration $4f\to4f$-transitions, and also the emission of two types of crystal structure defects, are observed, Under pulsed electronic excitation, the temporal characteristics of emission associated with an impurity center and defects and the temperature dependence of the luminescence yield were studied. The processes of energy transfer between defects and an impurity center are discussed.

Keywords: $5d\to4f$ luminescence, energy transfer, decay kinetics, ion Pr$^{3+}$.

Received: 06.05.2022
Revised: 27.06.2022
Accepted: 07.07.2022

DOI: 10.21883/OS.2022.10.53617.3624-22

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