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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.

Optical spectroscopy and unusual temperature shift of f – f zero-phonon luminescence lines: KTaO 3 :Er