Optical lines in europium–terbium double activated calcium tungstate phosphor

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• 作者：Nazarov ; M.V. ; Tsukerblat ; B.S. ; Popovici ; E.-J. ; Jeon ; D.Y.
• 关键词：71.15.-m ; 78.20.Bh ; 78.55.-m ; CaWO₄ ; Eu ; Tb ; Optical properties ; Polarization rules ; Luminescence
• 刊名：Physics Letters A
• 出版年：2004
• 期刊代码：57_03759601
• 类别：ph
• 出版时间：September 20, 2004
• 卷：330
• 期：3-4
• 页码：291-298
• 文件大小：274 K

摘要

The Letter is devoted to the problem of the optical anisotropy of the rare-earth ions occupying low-symmetry positions in crystals. The crystal field multiplets arising from LSJ terms of Eu³⁺ and Tb³⁺ ions in the crystal field of calcium tungstate scheelite (CaWO₄) are analyzed with regard to the experimental data on the low temperature photoluminescence and cathodoluminescence spectra. The selection rules as well as an angular (polarization) dependence of the two-photon absorption are discussed.