Synthesis, crystal structure and photoluminescent properties of Eu³⁺ ion-activated R₄MoO₉ (R?=?Y, Gd, and Lu)

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• 作者：Huaiyong Li^a ; Byung Kee Moon^b ; Byung Chun Choi^b ; Jung Hyun Jeong^b ; ^{jhjeong@pknu.ac.kr} ; Hyun Kyoung Yang^c ; Kiwan Jang^d ; Ho Sueb Lee^d ; Soung Soo Yi^e
• 关键词：Inorganic compounds ; Photoluminescence spectroscopy ; Powder diffraction ; Crystal symmetry
• 刊名：Materials Chemistry and Physics
• 出版年：2013
• 出版时间：15 May, 2013
• 年：2013
• 卷：139
• 期：2-3
• 页码：998-1002
• 全文大小：660 K

文摘

Rare earth molybdates R₄MoO₉ (R?=?Y, Gd, and Lu) with Eu³⁺ ion-doped were synthesized by solid-state reaction. The phase structure, optical absorption and photoluminescence properties of the as-prepared powder samples were studied. The powder X-ray diffraction patterns indicated that all the compounds crystallized in a hexagonal structure, and the lattice parameters reduced in the order of the ionic radii of R. The UV-visible diffuse reflectance spectra revealed that the compounds had a strong absorption of near-UV light due to the excitation of MoO₆ groups in the host lattices. The energy absorbed by the host lattices could then be transferred to doped Eu³⁺ ions, resulting in red emission due to the f-f transitions of Eu³⁺ ions. The optical absorption and photoluminescence properties of the compounds indicated that they might be candidates as the color-conversion red phosphors for solid-state lighting.