Abstract In this study, four batches of a QD-Ag hybrid in liquid state were prepared by mixing CdS quantum dots (QDs) with dispersions of Ag nanoparticle (NP). The luminescence-related properties of the CdS–Ag hybrid were tuned by adding Ag NPs. For each QD-Ag hybrid, the influence of the Ag/Cd ratio on the evolution of emission was studied systematically. We found that the PL properties of the hybrid depended on the amount of Ag concentration rather than the plasmonic properties of Ag NPs. In the hybrid, Ag doping occurred and caused the PL properties to change. As the number of Ag NPs increased, the band-edge emission decreased monotonically while the PL intensity of the dopant increased first and then decreased. A hypothetical model is proposed to explain the PL change of the QD-Ag hybrid with varying amounts of the Ag component.

中文翻译：

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用银粒子调节 CdS 量子点的发射

摘要 在本研究中，通过将 CdS 量子点 (QD) 与银纳米颗粒 (NP) 分散体混合，制备了四批液态 QD-Ag 杂化物。CdS-Ag 杂化物的发光相关特性通过添加 Ag NPs 进行调节。对于每个 QD-Ag 杂化物，系统地研究了 Ag/Cd 比对发射演变的影响。我们发现杂化物的 PL 特性取决于 Ag 浓度的量，而不是 Ag NPs 的等离子体特性。在混合中，Ag 掺杂发生并导致 PL 特性发生变化。随着Ag NPs数量的增加，带边发射单调减少，而掺杂剂的PL强度先增加后减小。提出了一个假设模型来解释 QD-Ag 混合体在不同数量的 Ag 组分下的 PL 变化。