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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Mechanisms of non-radiative energy transfer involving lanthanide ions revisited
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Mechanisms of non-radiative energy transfer involving lanthanide ions revisited

机译：涉及镧系元素离子的非辐射能量转移机理

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摘要

In this work, the theoretical background of the Coulomb direct and exchange interactions in non-radiative energy transfer involving lanthanide ions is critically reviewed. Emphasis is given to the shielding effect produced by the filled 5s and 5p sub-shells of the lanthanide ion and the appropriate use of the so-called forced electric dipole intensity parameters of 4f-4f transitions, two aspects that have been often overlooked in the literature. An effective exchange hamiltonian, based on Mulliken-type approximations, and an expression for the resonant or quasi-resonant energy mismatch spectral overlap factor are proposed. Both cases of ion-to-ion and intramolecular energy transfer processes are discussed. Numerical estimates are compared with previous calculations, showing that order of magnitude differences appear. The analysis indicates that the donor-acceptor distance dependence of transfer rates by the exchange mechanism goes beyond the single exponential behavior adopted from Dexter's approach.
机译：在这项工作中，对涉及镧系元素离子的非辐射能量转移中库仑直接和交换相互作用的理论背景进行了严格的综述。着重强调了镧系元素离子的5s和5p子壳充满后产生的屏蔽效应，以及适当使用所谓的4f-4f跃迁的强制电偶极强度参数，这两个方面经常被忽略。文学。提出了一种基于Mulliken型逼近的有效交换哈密尔顿量，以及一个共振或准共振能量失配谱重叠因子的表达式。讨论了离子对离子和分子内能量转移过程的两种情况。将数值估计与先前的计算进行比较，表明出现了数量级差异。分析表明，交换机制对转移速率的供体-受体距离依赖性超出了德克斯特方法采用的单一指数行为。

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