Optical study of defect clustering in NaCl:Sm2+
Optical study of defect clustering in NaCl:Sm2+
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NaCl:Sm2 中缺陷聚集的光学研究
DOI：
10.1063/1.430669
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发表时间：
1975
影响因子：
4.4
通讯作者：
F. K. Fong
中科院分区：
文献类型：
--
作者：
M. N. Sundberg;H. Lauer;F. K. Fong
本文报道了NaCl：Sm ~（2+）体系的详细光谱研究。与同系KCl：Sm 2+和KBr：Sm 2+系统形成鲜明对比的是，它们的窄线荧光光谱主要来自Sm 2 +−阳离子−空位对，NaCl：Sm 2+系统产生的光谱特性主要是簇的形成。除了通常的窄的5D 0 → 7 FJ荧光线起源于单个Sm 2 +−阳离子−空位对之外，还观察到大量的f → f和d → f线，这些线可归因于小的和大的Sm 2 +−缺陷团簇。的网站起源的荧光线确定塞曼各向异性荧光，寿命和偏振测量。许多强谱线的团簇起源已经通过高温退火淬火过程确定。在NaCl：Sm 2+中的缺陷聚类所发挥的突出作用被定性地解释在Sm 2+和Na+离子的离子半径的相当大的差异。
In this paper, we report a detailed spectroscopic investigation of the NaCl:Sm2+ system. In sharp contrast to the homologous KCl:Sm2+ and KBr:Sm2+ systems, whose narrow−line fluorescence spectra mainly arise from Sm2+−cation−vacancy pairs, the NaCl:Sm2+ system gives rise to spectroscopic properties that are dominated by cluster formation. In addition to the usual narrow 5D0 → 7FJ fluorescence lines originating from single Sm2+−cation−vacancy pairs a host of f → f and d → f lines attributable to small and large Sm2+−defect clusters is observed. The site origins of the fluorescence lines are determined by Zeeman anisotropy fluorescence, lifetime, and polarization measurements. The cluster origins of many intense lines have been ascertained through a high−temperature annealing−quenching procedure. The prominent role played by defect clustering in NaCl:Sm2+ is qualitatively explained in terms of the sizable difference in the ionic radii of the Sm2+ and the Na+ ions.