X-ray absorption study of rare earth ions in Sr2MgSi2O7:Eu2+,R3+ persistent luminescence materials
X-ray absorption study of rare earth ions in Sr2MgSi2O7:Eu2+,R3+ persistent luminescence materials
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DOI：
10.1016/j.optmat.2008.12.020
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发表时间：
2009-10-01
影响因子：
3.9
通讯作者：
Valtonen, Riikka
中科院分区：
文献类型：
--
作者：
Carlson, Stefan;Holsa, Jorma;Valtonen, Riikka
采用XANES方法研究了Sr_2 MgSi_2 O_7：Eu ~（2+），R ~（3+）余辉材料中Eu掺杂和稀土共掺杂（Ce ~（3+），Dy ~（3+），Yb ~（3+））的价态。结果表明，在所研究的所有材料中的二价和三价铕共存。观察到Eu 3+的相对量在增加暴露于X射线时增加，正如持久发光机制所预期的那样。这表明，最初由还原制备条件产生的氧空位同时被填充。对于Dy和Yb共掺杂剂，仅观察到三价物质。另一方面，痕量的四价铈存在于Eu、Ce共掺杂的材料中。(c)2009爱思唯尔有限公司版权所有。
The valence of the europium dopant and selected rare earth co-dopants (Ce3+, Dy3+, and Yb3+) in the Sr2MgSi2O7:Eu2+,R3+ persistent luminescence materials were studied by room temperature XANES measurements. The results indicated the co-existence of both divalent and trivalent europium in all the studied materials. The relative amount of Eu3+ was observed to increase upon increasing exposure to X-rays, as expected by the persistent luminescence mechanism. This suggests a simultaneous filling of oxygen vacancies initially created by the reducing preparation conditions. For the Dy and Yb co-dopants, only trivalent species were observed. On the other hand, traces of tetravalent cerium were present in the Eu,Ce co-doped materials. (c) 2009 Elsevier B.V. All rights reserved.