Effect of thermochemical treatments on laser-induced luminescence spectra from strontium titanate: comparison with swift ion-beam irradiation experiments
Abstract
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.
- Authors:
-
[1];
[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)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1846518
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- European Physical Journal. D, Atomic, Molecular, Optical and Plasma Physics
- Additional Journal Information:
- Journal Volume: 75; Journal Issue: 12; Journal ID: ISSN 1434-6060
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS
Citation Formats
Crespillo, Miguel L., Graham, Joseph T., Agulló-López, Fernando, Zhang, Yanwen, and Weber, William J. Effect of thermochemical treatments on laser-induced luminescence spectra from strontium titanate: comparison with swift ion-beam irradiation experiments. United States: N. p., 2021.
Web. doi:10.1140/epjd/s10053-021-00316-z.
Crespillo, Miguel L., Graham, Joseph T., Agulló-López, Fernando, Zhang, Yanwen, & Weber, William J. Effect of thermochemical treatments on laser-induced luminescence spectra from strontium titanate: comparison with swift ion-beam irradiation experiments. United States. https://doi.org/10.1140/epjd/s10053-021-00316-z
Crespillo, Miguel L., Graham, Joseph T., Agulló-López, Fernando, Zhang, Yanwen, and Weber, William J. Tue .
"Effect of thermochemical treatments on laser-induced luminescence spectra from strontium titanate: comparison with swift ion-beam irradiation experiments". United States. https://doi.org/10.1140/epjd/s10053-021-00316-z. https://www.osti.gov/servlets/purl/1846518.
@article{osti_1846518,
title = {Effect of thermochemical treatments on laser-induced luminescence spectra from strontium titanate: comparison with swift ion-beam irradiation experiments},
author = {Crespillo, Miguel L. and Graham, Joseph T. and Agulló-López, Fernando and Zhang, Yanwen and Weber, William J.},
abstractNote = {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.},
doi = {10.1140/epjd/s10053-021-00316-z},
journal = {European Physical Journal. D, Atomic, Molecular, Optical and Plasma Physics},
number = 12,
volume = 75,
place = {United States},
year = {Tue Dec 28 00:00:00 EST 2021},
month = {Tue Dec 28 00:00:00 EST 2021}
}
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