Phonons are important in energy transfer for compensating the energy mismatch between a donor and an acceptor. In inorganic hosts doped with lanthanides, phonon-assisted energy transfer can lead to quenching by a direct transfer of the energy to the phonon mode of the acceptor lanthanide. We demonstrate that this also applies to lanthanide coordination polymers and is the reason for the weak concentration quenching in this type of material. [YbxGd1–x(hfa)3dpbp]n [x = 0.001, 0.005, 0.01, 0.05, 0.1, 0.5, 1; hfa: hexafluoroacetylacetonate, dpbp: 4,4′-bis(diphenylphosphoryl)biphenyl] coordination polymers have been synthesized and their photophysical properties investigated. The single-exponential emission lifetimes of Yb3+ gradually decreased with increasing concentration of Yb3+. Qualitative agreement was achieved between the experimental and theoretical lifetimes by using the phonon-assisted energy-transfer-induced quenching model, which indicates that the origin of the concentration quenching in the coordination polymers is phonon-assisted energy transfer.

中文翻译：

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镱配位聚合物中浓度淬灭的起源：声子辅助能量转移

声子在能量转移中很重要，用于补偿供体和受体之间的能量失配。在掺杂镧系元素的无机主体中，声子辅助的能量转移可通过将能量直接转移到受体镧系元素的声子模式而导致猝灭。我们证明这也适用于镧系元素配位聚合物，并且是此类材料中弱浓度猝灭的原因。[YbxGd1–x(hfa)3dpbp]n [x = 0.001, 0.005, 0.01, 0.05, 0.1, 0.5, 1; hfa：六氟乙酰丙酮化物，dpbp：4,4'-双（二苯基磷酰基）联苯]配位聚合物已被合成并研究了它们的光物理性质。Yb3+的单指数发射寿命随着Yb3+浓度的增加而逐渐降低。