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Crystal structure of Eu-doped magnetoplumbite-type lanthanum aluminum oxynitride with emission site splitting

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Title: Crystal structure of Eu-doped magnetoplumbite-type lanthanum aluminum oxynitride with emission site splitting
Authors: Masubuchi, Yuji Browse this author →KAKEN DB
Hata, Tomoyuki Browse this author
Motohashi, Teruki Browse this author
Kikkawa, Shinichi Browse this author
Keywords: Lanthanum aluminum oxynitride
Magnetoplumbite structure
Photoluminescence
Neutron diffraction
Issue Date: Sep-2011
Publisher: Elsevier
Journal Title: Journal of Solid State Chemistry
Volume: 184
Issue: 9
Start Page: 2533
End Page: 2537
Publisher DOI: 10.1016/j.jssc.2011.07.035
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.
Type: article (author version)
URI: http://hdl.handle.net/2115/47214
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鱒渕 友治

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