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Photoluminescence spectra and unusual temperature shift of zero-phonon emission line of V³⁺ in SrTiO₃

Russian version

DOI: 10.61011/EOS.2023.04.56358.63-22

Skvortsov A. P.¹, Potůček Z.^2,3, Bryknar Z.³, Dejneka A.², Trepakov V. A.¹

¹Ioffe Institute, St. Petersburg, Russia
²Institute of Physics of the Czech Academy of Sciences, Praha, Czech Republic
³Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, Prague, Czech Republic

Email: a.skvortsov@mail.ioffe.ru, potucek@fzu.cz, dejneka@fzu.cz, trevl@mail.ioffe.ru

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Abstract
References
Статистика просмотров

The paper presents the first observation of photoluminescence spectra of V³⁺ impurity in SrTiO₃. The broad band of the observed emission is located in the near IR region and at low temperatures consists of a pronounced zero-phonon line (ZPL) with a maximum at 1157.1 nm (8642 cm^-1) at 77 K and developed vibronic sidebands extending to 1450 nm. The observed ZPL is associated with an intracenter ¹T_2g->³T_1g or a closely located ¹E_g->³T_1g emission transition in V³⁺ (3d²) ions replacing Ti⁴⁺ ions. It was found that the temperature shift of zero-phonon line is unusually large and its frequency decreases upon lowering the temperature. The local configuration instability of V³⁺ ions in the ³T_1g ground state caused by soft TO₁ temperature-dependent phonon mode present in SrTiO₃ is considered as a possible source of the observed unusual temperature shift. Keywords: ABO₃ incipient ferroelectrics, impurity ions of transition metals, luminescence, zero-phonon lines. DOI: 10.61011/EOS.2023.04.56358.63-22

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