Luminescence and Absorption Spectroscopy of Weakly Mn-Doped SrTiO₃ Crystals

Abstract

The emission and excitation spectra of photoluminescence of the as-grown and reduced SrTiO ₃ :Mn (280 ppm) crystal were studied within wide temperature (12 – 300 K) and spectral (300 – 1600 nm) regions. The emission spectra consist of two overlapping bands. The first one corresponds to the emission of Mn ^{4 +} ions substituted in octahedral coordinated Ti ⁴⁺ sites with zero-phonon line peaking at 723.23 nm at 12 K. The second broad emission band peaking near 870 nm was observed on SrTiO₃:Mn crystals for the first time. Temperature behavior of photoluminescence intensity and the origin of this new Mn related emission band are discussed.

Keywords:

• Photoluminescence
• optical absorption
• strontium titanate
• Mn impurity centers

Acknowledgments

This research was supported by the grant KJB100100703 of the Grant Agency of the Academy of Sciences of the Czech Republic, by the project MSM 6840770021, and by RFBR grant 06-02-17320.