Effects of doping and epitaxy on optical behavior of NaNbO3 films
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© 2015 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the authors and the American Institute of Physics. The following article appeared in Applied Physics Letters. Volume 107, Issue 17 and may be found at http://scitation.aip.org/content/aip/journal/apl/107/17/10.1063/1.4934850.
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School of Science |
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2015
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Language
en
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172906/1-4
Series
Applied Physics Letters, Volume 107, Issue 17
Abstract
Cube-on-cube epitaxy of perovskite sub-cell of Pr-doped and undoped NaNbO3 is obtained in 130-nm-thick films on top of (La0.18Sr0.82)(Al0.59Ta0.41)O3 (001) substrates. Experimental studies show that the edge of optical absorption red-shifts and some interband transitions change in the films compared to crystals. Bright red luminescence is achieved at room-temperature under ultraviolet excitation in the Pr-doped film. An interband mechanism of luminescence excitation is detected in the film, which is in contrast to the intervalence charge transfer mechanism in the crystal. The results are discussed in terms of epitaxially induced changes of crystal symmetry and ferroelectric polarization in the films. It is suggested that the band structure and interband transitions in NaNbO3and the transition probabilities in the Pr ions can be significantly modified by these changes.Description
Keywords
optical absorption, interband transitions, ferroelectricity
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Citation
Kocourek, T. & Inkinen, S. & Pacherova, O. & Chernova, E. & Potucek, Z. & Yao, L. D. & Jelinek, M. & Dejneka, A. & van Dijken, S. & Tyunina, M. 2015. Effects of doping and epitaxy on optical behavior of NaNbO3 films. Applied Physics Letters. Volume 107, Issue 17. 172906/1-4. 0003-6951 (printed). DOI: 10.1063/1.4934850.