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    Title: Europium location in the AlN: Eu green phosphor prepared by a gas-reduction-nitridation route
    Authors: Yin, Liang-Jun;Zhu, Qiang-Qiang;Yu, Wei;Hao, Lu-Yuan;Xu, Xin;Hu, Feng-Chun;Lee, Ming-Hsien
    Contributors: 淡江大學物理學系
    Date: 2012
    Issue Date: 2013-02-20 17:33:36 (UTC+8)
    Publisher: College Park: American Institute of Physics
    Abstract: Eu doped aluminum nitride phosphors were successfully synthesized by a novel gas-reduction-nitridation route with a reaction temperature of 1400 °C and a soaking time of 3 h. The obtained AlN:Eu phosphors were analyzed to elucidate the location of the Eu luminescent center. High-resolution transmission electron microscopy and transmission electron microscopy-energy dispersive spectra proved that Eu was located in the crystal lattice of AlN, then EXAFS revealed that Eu occupied a highly distorted Al site coordinated by four nitrogen at about 2.30–2.40 Å, and the second nearest neighbors of Eu were 12 Al. This could be confirmed by the first-principles calculations based on the obtained local structure around the Eu luminescence center, where the theoretical absorption spectrum was similar to the experimental excitation spectrum. X-ray appearance near edge structure showed that Eu existed in terms of both Eu3+ and Eu2+ ions, which could be related to the limited location space of Eu. High temperature treatment could significantly increase the amount of Eu2+ by the expansion of the crystal lattice, leading to an increased green luminescence of the obtained AlN:Eu phosphors.
    Relation: Journal of Applied Physics 111(5), 053534(7pages)
    DOI: 10.1063/1.3692810
    Appears in Collections:[物理學系暨研究所] 期刊論文

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