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Optical spectroscopy and unusual temperature shift of f - f zero-phonon luminescence lines: KTaO3:ErTrepakov, V. A.; Skvortsov, A. P.; Potucek, Z.; Bryknar, Z.; Nuzhnyy, D.; Laguta, V.; Kuznetsov, V. G.; Gavrikov, A. A.; Dejneka, A.
Ferroelectrics, 06/2022, Volume: 591, Issue: 1Journal Article
We present a study of KTaO 3 :Er (≈0.05%) single crystals based on a multifaceted approach including the use of optical absorption, far-infrared reflectivity, electron paramagnetic resonance, photoluminescence spectra, and ab initio simulations. We describe briefly the fundamental consequences of Er doping, in particular, stiffening of TO1 soft mode of KTaO 3 . We provide information about energy level structures controlling f - f optical transitions in Er 3+ , on formation of minor cubic octahedral and major orthorhombic Er 3+ centers. It is revealed that the temperature shift of narrow zero-phonon emission lines is strikingly unusual being much larger than that typical for trivalent rare-earth impurities.
