Photoluminescence Spectra and Unusual Temperature Shift of Zero-Phonon Emission Line of V3+ in SrTiO3

• Published in: Optics and spectroscopy Vol. 131; no. 3; pp. 183 - 186
• Main Authors: Skvortsov, A. P., Potuček, Z., Bryknar, Z., Dejneka, A., Trepakov, V. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.03.2023; Springer Nature B.V
• Subjects: Emission; Lasers; Low temperature; Optical Devices; Optics; Phonons; Photoluminescence; Photonics; Physics; Physics and Astronomy; Spectra; Strontium titanates; Temperature dependence; incipient ferroelectrics; luminescence; zero-phonon lines; ABO; impurity ions of transition metals
• ISSN: 0030-400X; 1562-6911
• DOI: 10.1134/S0030400X23040197

The paper presents the first observation of photoluminescence spectra of V 3+ impurity in SrTiO 3 . 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 1450nm. The observed ZPL is associated with an intracenter 1 T 2 g → 3 T 1 g or a closely located 1 E g → 3 T 1 g emission transition in V 3+ (3 d 2 ) ions replacing Ti 4+ 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 V 3+ ions in the 3 T 1 g ground state caused by soft TO 1 temperature-dependent phonon mode present in SrTiO 3 is considered as a possible source of the observed unusual temperature shift.