A quantum electrodynamical theory of three-center energy transfer for upconversion and downconversion in rare earth doped materials
A quantum electrodynamical theory of three-center energy transfer for upconversion and downconversion in rare earth doped materials
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DOI：
10.1063/1.1323958
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发表时间：
2001-01
影响因子：
4.4
通讯作者：
D. Andrews;R. D. Jenkins
中科院分区：
文献类型：
--
作者：
D. Andrews;R. D. Jenkins
三中心能量转移为稀土掺杂材料中的各种多光子过程提供了基本机制。用量子电动力学处理理论，得到了基本光物理与三个离子相互作用的系统的一般结果。确定了不同的合作和增长机制路径，并建立了理论，以得出它们在上转换、敏化和下转换或量子切割等能量转移现象中的作用和特点。结果表明，虽然这两种机制在聚集和切割过程中起着重要的作用，但只有增生机制负责敏化过程。这两种机制都调用了拉曼选择规则，该规则控制着聚合机制中介体离子的跃迁和合作机制中受主离子的跃迁。局域微观水平的结果被用来测量晶格响应，包括浓度和结构。
Three-center energy transfer affords the basic mechanism for a variety of multiphoton processes identified within materials doped with rare earths. Addressing the theory using quantum electrodynamics, general results are obtained for systems in which the fundamental photophysics engages three ions. Distinct cooperative and accretive mechanistic pathways are identified and the theory is formulated to elicit their role and features in energy transfer phenomena of pooling upconversion, sensitization, and downconversion or quantum cutting. It is shown that although the two mechanisms play significant roles in pooling and cutting, only the accretive mechanism is responsible for sensitization processes. Both mechanisms are shown to invoke Raman selection rules, which govern transitions of the mediator ions in the accretive mechanisms and transitions of the acceptor ions in the cooperative mechanisms. The local, microscopic level results are used to gauge the lattice response, encompassing concentration and stru...