Optics and Spectroscopy
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- 2023
- 2022
Photoluminescence spectra and unusual temperature shift of zero-phonon emission line of V3+ in SrTiO3
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 1T2g->3T1g or a closely located 1Eg->3T1g 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 3T1g 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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