| 基质发光材料Na5Eu(MoO4)4和NaEu(MoO4)2的喇曼光谱 |
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| 引用本文： | 郭常新,李碧琳.基质发光材料Na5Eu(MoO4)4和NaEu(MoO4)2的喇曼光谱[J].发光学报,1991,12(3):244-253. |
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| 作者姓名： | 郭常新 李碧琳 |
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| 作者单位： | 1. 中国科学技术大学物理系;2. 中国科学技术大学结构分析开放实验室 |
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| 摘 要： | 本文研究了基质发光材料Na5Eu(MoO4)4和NaEu(MoO4)2的喇曼光谱.用群论方法分析了它们的内、外振动模式,对实验振动模进行了指认.本文还将上述喇曼光谱与Na5Eu(WO4)4、CaWO4、SrWO4、CaMoO4和SrMoO4的喇曼光谱进行了比较,Na5Eu(MoO4)4和NaEu(MoO4)2的喇曼光谱结果表明(MoO4)2-离子团的高能量拉伸内振动是产生Eu3+的5D2→5D1,5D1→5D0-多声子无辐射弛豫的原因,这导致了Eu3+在这类材料中主要产生5DO→7Fj的发光跃迁.
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| 关 键 词： | Na5Eu（moO4）4 NaEu（MoO4）2 光谱 |
| 收稿时间： | 1990-09-19 |
RAMAN SPECTRA OF HOST LUMINESCENT MATERIALS Na5Eu(MoO4)4 AND NaEu(MoO4)2 |
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| Guo Changxin,Li Bilin.RAMAN SPECTRA OF HOST LUMINESCENT MATERIALS Na5Eu(MoO4)4 AND NaEu(MoO4)2[J].Chinese Journal of Luminescence,1991,12(3):244-253. |
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| Authors: | Guo Changxin Li Bilin |
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| Institution: | 1. Department of Physics, University of Science and Technology of China;2. Structure Research Laboratory, USTC, Academia Sinica |
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| Abstract: | Na5Eu(MoO4)4 and NaEu(MoO4)2 are stoichiorr.etric host luminescent materials having high concentration of luminescent Eu3+ ions and no noticeable concentration quenching. Raman spectra of these two materials have been studied. The symmetry species of the lattice vibration modes of Na5Eu(MoO4)4 have been analysed by means of the group theory.The structures of both materials belong to tetragonal, I4I/a (C4h6) space group. For Na5Eu(MoO4)4, the free ion symmetries of (MoO4)2-, Eu3+ and Na1+ correlate with factor group C4h through their site groups. A primitive cell includes two Na5Eu(MoO4)4 molecules. It mears that 8 (MoO4)42-, 10 Na1+ and 2 Eu3+ are included in the cell. So the lattice vibration of Na5Eu(MoO4)4 in the cell can be classified into 72 internal modes and 84 external modes. For crystal factor group C4h, the Ag,Bg and Eg modes are Raman active and Au and Eu modes are infrared active. |
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