Effect of thermochemical treatments on laser-induced luminescence spectra from strontium titanate: comparison with swift ion-beam irradiation experiments

Crespillo, Miguel L.; Graham, Joseph T.; Agulló-López, Fernando; Zhang, Yanwen; Weber, William J.

doi:10.1140/epjd/s10053-021-00316-z

Title: Effect of thermochemical treatments on laser-induced luminescence spectra from strontium titanate: comparison with swift ion-beam irradiation experiments

Journal Article · Tue Dec 28 00:00:00 EST 2021 · European Physical Journal. D, Atomic, Molecular, Optical and Plasma Physics

DOI:https://doi.org/10.1140/epjd/s10053-021-00316-z· OSTI ID:1846518

^[1]; Graham, Joseph T. ^[2]; Agulló-López, Fernando ^[3];

^[4];

^[5]

Autonomous Univ. of Madrid (Spain); Univ. of Tennessee, Knoxville, TN (United States)
Missouri Univ. of Science and Technology, Rolla, MO (United States)
Autonomous Univ. of Madrid (Spain)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Results recently reported on the effect of thermochemical treatments on the (He-Cd) laser-excited emission spectra of strontium titanate (STO) are re-analyzed here and compared with results obtained under ion-beam irradiation. Contributing bands centered at 2.4 eV and 2.8 eV, which appear under laser excitation, present intensities dependent upon previous thermal treatments in oxidizing (O₂) or reducing atmosphere (H₂). As a key result, the emission band centered at 2.8 eV is clearly enhanced in samples exposed to a reducing atmosphere. From a comparison with the ionoluminescence data, it is concluded that the laser-excited experiments can be rationalized within a framework developed from ion-beam excitation studies. In particular, the band at 2.8 eV, sometimes attributed to oxygen vacancies, behaves as expected for optical transitions from conduction-band (CB) states to the ground state level of the self-trapped exciton center. The band at 2.0 eV reported in ion-beam irradiated STO, and attributed to oxygen vacancies, is not observed in laser-excited crystals. As a consequence of our analysis, a consistent scheme of electronic energy levels and optical transitions can now be reliably offered for strontium titanate.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1846518

Journal Information:: European Physical Journal. D, Atomic, Molecular, Optical and Plasma Physics, Vol. 75, Issue 12; ISSN 1434-6060

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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