Electronic structure of Ce3+ in yttrium and lutetium orthoaluminate crystals and single crystal layers

Yongjie Wang , Damian Włodarczyk , Li Li , Aleksander Wittlin , Hanka Przybylinska , Piotr Sybilski , Ya. Zhydachevskii , Chong-Geng Ma , Mikhail G. Brik , Michał Malinowski , Yu. Zorenko , V. Gorbenko , Andrzej Suchocki

Abstract

Low temperature infrared absorption spectra of yttrium orthoaluminate and lutetium orthoaluminate bulk crystals and liquid phase epitaxy grown single crystalline films doped with Ce3+ are presented. In the region of intra-configurational 4f – 4f transitions the spectra indicate the existence of at least three different Ce3+ related centers. The dominant center is associated with Ce substituting yttrium or lutetium. The two additional centers are most probably related to so called antisite positions of rare-earth ions in orthoaluminates, i.e., ions on Al sites. The concentration of antisite defects is lower in epitaxially grown layers of yttrium orthoaluminate than in the bulk crystals, in spite of the higher doping concentration. In contrast, in lutetium orthoaluminate additional Ce3+ centers are also present in epitaxial layers at quite high concentration. Crystal field analysis based on the exchange charge model exhibits excellent agreement of the calculated transition energies with experimental data for the dominant Ce3+ center. The linewidths of the 4f-4f transitions in both types of crystals are different depending on the final level of transition. This is explained as a result of electron-phonon coupling, enhanced by the matching inter-level spacing of the 2F7/2 state with phonon energies of the examined materials.
Author Yongjie Wang - [Institute of Physics of the Polish Academy of Sciences]
Yongjie Wang,,
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, Damian Włodarczyk - [Institute of Physics of the Polish Academy of Sciences]
Damian Włodarczyk,,
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, Li Li - [Institute of Physics of the Polish Academy of Sciences]
Li Li,,
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, Aleksander Wittlin - [Institute of Physics of the Polish Academy of Sciences]
Aleksander Wittlin,,
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, Hanka Przybylinska - [Institute of Physics of the Polish Academy of Sciences]
Hanka Przybylinska,,
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, Piotr Sybilski - [Institute of Physics of the Polish Academy of Sciences]
Piotr Sybilski,,
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, Ya. Zhydachevskii - [Institute of Physics of the Polish Academy of Sciences]
Ya. Zhydachevskii,,
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, Chong-Geng Ma - [Chongqing University of Posts and Telecommunications]
Chong-Geng Ma,,
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, Mikhail G. Brik - [Chongqing University of Posts and Telecommunications]
Mikhail G. Brik,,
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, Michał Malinowski (FEIT / MO)
Michał Malinowski,,
- The Institute of Microelectronics and Optoelectronics
et al.`
Journal seriesJournal of Alloys and Compounds, ISSN 0925-8388, (A 35 pkt)
Issue year2017
Vol723
No5 November
Pages157-163
ASJC Classification2505 Materials Chemistry; 2506 Metals and Alloys; 2210 Mechanical Engineering; 2211 Mechanics of Materials
DOIDOI:10.1016/j.jallcom.2017.06.235
URL http://www.sciencedirect.com/science/article/pii/S0925838817322430
Languageen angielski
Score (nominal)35
Score sourcejournalList
ScoreMinisterial score = 35.0, 22-03-2020, ArticleFromJournal
Publication indicators Scopus Citations = 1; WoS Citations = 1; GS Citations = 1.0; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.407; WoS Impact Factor: 2017 = 3.779 (2) - 2017=3.315 (5)
Citation count*1 (2020-02-28)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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