Crystal structure of Eu-doped magnetoplumbite-type lanthanum aluminum oxynitride with emission site splitting
Abstract
Eu-doped lanthanum aluminum oxynitride (LaAl12(O,N)19) with magnetoplumbite structure was prepared by nitridation of the oxide precursor obtained from aluminum glycine gel and subsequent post-annealing. Eu-doped lanthanum aluminum oxynitride exhibited blue light emission at 440 nm with a shoulder at 464 nm under excitation at 254 nm. Isostructural Eu-doped calcium aluminum oxide (CaAl12O19) exhibited a single emission peak at 415 nm. Structural refinement using neutron powder diffraction indicated that the lanthanum site occupied partially by Eu^[2+] splits into 2d and 6h sites in the aluminum oxynitride. The longer emission and the shoulder peak in the former aluminum oxynitride were observed in relation to the increasing covalency as well as crystal field splitting around doped Eu^[2+] induced by site splitting involved with the two kinds of anions.
Journal
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- Journal of Solid State Chemistry
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Journal of Solid State Chemistry 184 (9), 2533-2537, 2011-09
Elsevier
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Keywords
Details 詳細情報について
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- CRID
- 1050282813986138752
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- NII Article ID
- 120003370694
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- HANDLE
- 2115/47214
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- ISSN
- 00224596
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- CiNii Articles