Effects of doping and epitaxy on optical behavior of NaNbO3 films

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...

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Published in:Applied physics letters 2015-10, Vol.107 (17)
Main Authors: Kocourek, T., Inkinen, S., Pacherova, O., Chernova, E., Potucek, Z., Yao, L. D., Jelinek, M., Dejneka, A., van Dijken, S., Tyunina, M.
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Language:English
Subjects:
Applied physics
Charge transfer
Crystals
Doped films
Epitaxy
Excitation
Ferroelectric materials
Ferroelectricity
Luminescence
Perovskites
Sodium compounds
Substrates
Thick films
Transition probabilities
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cited_by cdi_FETCH-LOGICAL-c292t-9d94f3aed02ceb1b47c93733dd7b5b1b5949a69679d421997c204f018be76a3e3
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container_end_page
container_issue 17
container_start_page
container_title Applied physics letters
container_volume 107
creator Kocourek, T.
Inkinen, S.
Pacherova, O.
Chernova, E.
Potucek, Z.
Yao, L. D.
Jelinek, M.
Dejneka, A.
van Dijken, S.
Tyunina, M.
description 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 NaNbO3 and the transition probabilities in the Pr ions can be significantly modified by these changes.
doi_str_mv 10.1063/1.4934850
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subjects Applied physics
Charge transfer
Crystals
Doped films
Epitaxy
Excitation
Ferroelectric materials
Ferroelectricity
Luminescence
Perovskites
Sodium compounds
Substrates
Thick films
Transition probabilities
title Effects of doping and epitaxy on optical behavior of NaNbO3 films
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