高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (7): 1021.

• 论文 • 上一篇    下一篇

Eu2+在多相体系中的发光

刘应亮1, 冯德雄1, 杨培慧1, 石春山2   

  1. 1. 暨南大学化学系, 广州 510632;
    2. 中国科学院长春应用化学研究所稀土化学与物理开放实验室, 长春 130022
  • 收稿日期:1998-08-18 出版日期:1999-07-24 发布日期:1999-07-24
  • 通讯作者: 刘应亮,男,38岁,副教授
  • 作者简介:刘应亮,男,38岁,副教授
  • 基金资助:

    广东省自然科学基金(批准号:970613);稀土化学与物理开放实验室基金(批准号:93295240);国务院侨务办公室基金

The Luminescence of Eu2+in Mixed Phase System

LIU Ying-Liang1, FENG De-Xiong1, YANG Pei-Hui1, SHI Qing-shan2   

  1. 1. Department of Chemistry, Jinan University, Guangzhou, 510632;
    2. Laboratory of Rare Earth Chemistry and Physics, Chang chun Institute of Applied Chemistry, Chinese Acadamy of Sciences, Chang chun, 130022
  • Received:1998-08-18 Online:1999-07-24 Published:1999-07-24

摘要: 研究了基质结构与离子半径的形成关系和Eu2+在同时形成的多相体系中的发光现象.在MMgAl10O17体系中,当M离子半径小于0.10nm时,体系形成多相共存.首次观察到在磁铅矿、尖晶石和α-Al2O3三相同时共存体系中,Eu2+优先占据离子半径和电荷与之匹配的磁铅矿中的Ca2+离子格位,不进入尖晶石和α-Al2O3晶相中的Mg2+、Al3+离子格位,仅产生Eu2+的d→f跃迁宽带发射,且观察不到Eu3+的特征光谱;在尖晶石和α-Al2O3两相同时共存体系中,Eu2+可进入尖晶石和α-Al2O3晶相中的Mg2+、Al3+离子格位,分别产生Eu2+的d→f和f→f跃迁发射,同时还观察到相当强的Eu3+的特征光谱;在α-Al2O3单一相中,Eu2+产生f→f跃迁发射,并观察到明显的Eu3+的特征光谱,在α-Al2O3与γ-Al2O3同时存在的混合相中,Eu2+的f→f跃迁发射消失,产生新的d→f跃迁宽带发射.

关键词: 铕, 多相体系, 发光, 价态稳定性

Abstract: The dependence of the structure of the hosts on the Mion radius in MMgAl10O17(M=Be, Mg, Ca, Sr, Ba, Pb, Eu, Mn, Fe, Co, Ni, Zn, Cd, Sn) system was studied and the luminescence of Eu2+in the mixed phase system was discussed. When Mion radius is less than 0.10nm, the system MMgAl10O17constructs by the mixed phases consisting of manegtoplumbite and spinel, α-alumina or spinel and α-alumina. In the mixed phase of manegtoplumbite and spinel and α-alumina, Eu2+ion preferentially occupies lattice site of the cations in manegtoplumbite well matched with the radius and charge of Eu2+. There exists only d→f transition emission of Eu2+and no characteristic emission of Eu3+occurs in those hosts. In the mixed phase of spinel and α alumina, Eu2+can enter the lattice site of Mg2+ion or Al 3+ion and the d→f and f→f transition of Eu2+can been observed respectively. Mean-while, since the radius and charge of matrix lattice ions substituted by Eu2+do not match with those of Eu2+, the valence state of Eu2+is unstable. Eu2+is partly changed into Eu3+and the emission of Eu3+is obviously observed even under the condition of reduction atmosphere. If reaction temperature is more than1150 ℃, Al2O3forms α-Al2O3structure, the f→f transition of Eu2+appears. If reaction temperature is less than1150 ℃, a mixed phase of α-Al2O3and γ-Al2O3is formed, the f→f transition of Eu2+disappears and a new band emission from d→f transition of Eu2+occurs.

Key words: Europium, Mixed phase system, Luminescence, Valence state stability

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