Isolated oxygen vacancies in strontium titanate shine red: Optical identification of Ti3+ polarons
Abstract
Oxide perovskites exhibit fascinating physical properties that identify them as key materials for the next generation of oxide-based functional electronic devices, as well as for catalysis and photochemistry applications. In strontium titanate, substantial efforts have been devoted to elucidate the role of oxygen vacancies and localized electronic states, such as polarons, on those properties. In this paper, a new model is presented that assigns a definitive red luminescence signature at 2.0 eV to Ti3+ polarons trapped at isolated oxygen vacancies. This emission provides an unequivocal identification for the oxygen vacancies, which allows monitoring their creation and annealing by a variety of physio-chemical treatments. Ionoluminescence with energetic (MeV) ion beams enables such identification by combining the sensitivity and resolution of spectroscopic techniques with their in situ character, as well as controlled incorporation of point defects, such as oxygen vacancies. Alternative models assigning the blue luminescence emission at 2.8 eV to oxygen vacancies are not supported by the experimental results. Finally and therefore, oxygen vacancies shine red and not blue, as previously proposed.
- Authors:
-
- Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
- Missouri Univ. of Science and Technology, Rolla, MO (United States). Dept. of Mining and Nuclear Engineering; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
- Autonomous Univ. of Madrid (Spain). Centre for the Micro Analysis of Materials (CMAM)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
- Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Univ. of Tennessee (United States)
- OSTI Identifier:
- 1468192
- Alternate Identifier(s):
- OSTI ID: 1698193
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Materials Today
- Additional Journal Information:
- Journal Volume: 12; Journal ID: ISSN 2352-9407
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; strontium titanate; defects; oxygen vacancies; polarons; ionoluminescence
Citation Formats
Crespillo, M. L., Graham, J. T., Agulló-López, F., Zhang, Y., and Weber, W. J. Isolated oxygen vacancies in strontium titanate shine red: Optical identification of Ti3+ polarons. United States: N. p., 2018.
Web. doi:10.1016/j.apmt.2018.04.006.
Crespillo, M. L., Graham, J. T., Agulló-López, F., Zhang, Y., & Weber, W. J. Isolated oxygen vacancies in strontium titanate shine red: Optical identification of Ti3+ polarons. United States. https://doi.org/10.1016/j.apmt.2018.04.006
Crespillo, M. L., Graham, J. T., Agulló-López, F., Zhang, Y., and Weber, W. J. Thu .
"Isolated oxygen vacancies in strontium titanate shine red: Optical identification of Ti3+ polarons". United States. https://doi.org/10.1016/j.apmt.2018.04.006. https://www.osti.gov/servlets/purl/1468192.
@article{osti_1468192,
title = {Isolated oxygen vacancies in strontium titanate shine red: Optical identification of Ti3+ polarons},
author = {Crespillo, M. L. and Graham, J. T. and Agulló-López, F. and Zhang, Y. and Weber, W. J.},
abstractNote = {Oxide perovskites exhibit fascinating physical properties that identify them as key materials for the next generation of oxide-based functional electronic devices, as well as for catalysis and photochemistry applications. In strontium titanate, substantial efforts have been devoted to elucidate the role of oxygen vacancies and localized electronic states, such as polarons, on those properties. In this paper, a new model is presented that assigns a definitive red luminescence signature at 2.0 eV to Ti3+ polarons trapped at isolated oxygen vacancies. This emission provides an unequivocal identification for the oxygen vacancies, which allows monitoring their creation and annealing by a variety of physio-chemical treatments. Ionoluminescence with energetic (MeV) ion beams enables such identification by combining the sensitivity and resolution of spectroscopic techniques with their in situ character, as well as controlled incorporation of point defects, such as oxygen vacancies. Alternative models assigning the blue luminescence emission at 2.8 eV to oxygen vacancies are not supported by the experimental results. Finally and therefore, oxygen vacancies shine red and not blue, as previously proposed.},
doi = {10.1016/j.apmt.2018.04.006},
journal = {Applied Materials Today},
number = ,
volume = 12,
place = {United States},
year = {Thu Aug 30 00:00:00 EDT 2018},
month = {Thu Aug 30 00:00:00 EDT 2018}
}
Web of Science
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