Spin-orbit coupling dependent energy transfer in luminescent nonanuclear Yb-Gd / Yb-Lu clusters
Spin-orbit coupling dependent energy transfer in luminescent nonanuclear Yb-Gd / Yb-Lu clusters
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DOI：
10.1016/j.jlumin.2018.04.049
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发表时间：
2018-09
影响因子：
3.6
通讯作者：
Shun Omagari;T. Nakanishi;Y. Kitagawa;T. Seki;K. Fushimi;Hajime Ito;A. Meijerink;Y. Hasegawa
中科院分区：
文献类型：
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作者：
Shun Omagari;T. Nakanishi;Y. Kitagawa;T. Seki;K. Fushimi;Hajime Ito;A. Meijerink;Y. Hasegawa
在发光稀土(Ln(III))配合物中，有机配体的三重态激发态的产额和寿命是影响配体到Ln(III)的能量转移效率的关键因素。这些因素依赖于Ln(III)离子通过重原子和顺磁效应混合不同多重态而引起的自旋-轨道耦合。我们研究了这些效应对合成的非核Yb-Gd/Yb-Lu簇合物([Ln9(µ-OH)10(水杨酸丁酯)16]NO3，Ln9= YbnGd9-Nor YbnLu9-n，n= 0，1，3，7和9)中能量转移效率的影响。根据配体的荧光和磷光强度，其自旋-轨道耦合强度顺序为：Yb(III)>； Gd(III)>； Lu(III)。从自旋-轨道耦合的角度讨论了影响YbnGd9-Nand和YbnLu9-n团簇能量转移效率的各种光物理过程，并对如何优化能量转移效率提供了见解。
In luminescent lanthanide (Ln(III)) complexes, the yield and the lifetime of triplet excited state of organic ligands are crucial factors that affect the ligands-to-Ln(III) energy transfer efficiency. Such factors are dependent on spin-orbit coupling induced by the Ln(III) ions that mixes different multiplicity states through heavy atom and paramagnetic effects. We investigated the role of these effects on the energy transfer efficiency in synthesized nonanuclear Yb-Gd / Yb-Lu clusters ([Ln9(µ-OH)10(butyl salicylate)16]NO3, Ln9= YbnGd9-nor YbnLu9-n,n= 0, 1, 3, 7, and 9). Based on the intensity of the fluorescence and phosphorescence of the ligands, the spin-orbit coupling strength was in the order of Yb(III) > Gd(III) > Lu(III). Various photophysical processes affecting the energy transfer efficiency in YbnGd9-nand YbnLu9-nclusters are discussed from the perspective of spin-orbit coupling and give insight in how to optimize energy transfer efficiencies.