Energy transfer in Sr0.6Ba0.4Nb2O6 through its ferroelectric phase transition

被引：0
|
作者：
Caldino, U. [1 ]
Martin-Rodriguez, E. [2 ]
Jaque, D. [2 ]
Sole, J. Garcia [2 ]
Bettinelli, M. [3 ,4 ]
机构：
[1] Univ Autonoma Metropolitana Iztapalapa, Dept Fis, Mexico City 09340, DF, Mexico
[2] Univ Autonoma Madrid, Dept Fis Mat, E-28049 Madrid, Spain
[3] Univ Verona, Dipartimento Sci & Tecnol, I-37314 Verona, Italy
[4] UdR Verona, INSTM, I-37314 Verona, Italy
来源：
REVISTA MEXICANA DE FISICA | 2008年 / 54卷 / 02期
关键词：
Energy transfer efficiency; luminescence; spectroscopy; SBN; Nd3+; Yb3+; phase transition;
D O I：
暂无
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Resonant Nd3+ -> Yb3+ energy-transfer in the Nd3+ and Yb3+ co-doped Sr0.6Ba0.4(NbO3)(2) (SBN) crystal is investigated by using pulsed and steady state laser spectroscopy. Spectroscopic data revealed that the energy transfer occurs via a non-radiative process. The efficiency of this energy transfer was estimated from spectral data in around 35%. Back energy transfer is not observed at the 295-415 K temperature range. A marked reduction in the luminescence intensity of Yb3+ ions directly excited into their F-2(7/2) -> F-2(5/2) transition, taking place at around 345 K, is due to the ferro to paraelectric phase transition in SBN. This thermal behavior, which is not clearly manifested when Yb3+ ions are excited via Nd3+ ions, has been explained in terms of structural changes taking place around the Yb3+ ions when the crystal becomes non-polar.
引用
收藏
页码：39 / 43
页数：5
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