Luminescence properties of Eu³⁺-doped new scheelite-type compounds

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• 作者：Jiao WANG ((王 娇))^a ; Zhijun ZHANG ((张志军))^b ; Jingtai ZHAO ((赵景泰))^b ; ^{jtzhao@shu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Eu3+ red luminescence ; scheelite-type ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2015
• 出版时间：1 December 2015
• 年：2015
• 卷：33
• 期：12
• 页码：1241-1245
• 全文大小：906 K

文摘

The efficient new red emitting scheelite-type compounds, Eu³⁺-doped (5 mol.%) Y(Zr_0.5W_0.5)O₄, Lu(Zr_0.5W_0.5)O₄ and Y(Y_1/3W_2/3)O₄, were successfully prepared. The crystal structure, photoluminescence and decay properties of the obtained phosphors were investigated. Shifts of the peaks in the XRD patterns were observed when Y³⁺ sites in the host were occupied by Lu³⁺ or Zr/W sites were occupied by Y/W. As a result of the crystallographic occupancy of Eu³⁺ located at the cation positions without inversion symmetry, under O→Zr/W and O→Eu³⁺ ligand-to-metal charge-transfer states (LMCT) excitation at 300 nm, the emission spectra of these compounds presented ⁵D₀→⁷F₂ transition for Eu³⁺ at 612 nm. The diagram of Eu³⁺ energy levels in these new scheelite-type compounds and the energy transfer processes were discussed.