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Abstract：
In this work, the production of novel multishell silver indium selenide quantum dots (QDs) shelled with zinc selenide and zinc sulfide through a multistep synthesis precisely designed to develop high-quality red-emitting QDs is explored. The formation of the multishell nanoheterostructure significantly improves the photoluminescence quantum yield of the nanocrystals from 3% observed for the silver indium selenide core to 27 and 46% after the deposition of the zinc selenide and zinc sulfide layers, respectively. Moreover, the incorporation of the multishelled QDs in a poly(methyl methacrylate) (PMMA) matrix via in situ radical polymerization is investigated, and the role of thiol ligand passivation is proven to be fundamental for the stabilization of the QDs during the polymerization step, preventing their decomposition and the relative luminescence quenching. In particular, the role of interface chemistry is investigated by considering both surface passivation by inorganic zinc chalcogenide layers, which allows us to improve the optical properties, and organic thiol ligand passivation, which is fundamental to ensuring the chemical stability of the nanocrystals during in situ radical polymerization. In this way, it is possible to produce silver-indium selenide QD-PMMA composites that exhibit bright red luminescence and high transparency, making them promising for potential applications in photonics. Finally, it is demonstrated that the new silver indium selenide QD-PMMA composites can serve as an efficient color conversion layer for the production of red light-emitting diodes.
摘要：
在这项工作中,探索了通过精确设计以开发高质量红色发射QD的多步骤合成来生产用硒化锌和硫化锌壳的新型多壳银硒化铟量子点（QD）。多壳纳米异质结构的形成显着提高了纳米晶体的光致发光量子产率，从硒化银铟核的3％到硒化锌和硫化锌层沉积后的27％和46％，分别。此外，研究了通过原位自由基聚合在聚（甲基丙烯酸甲酯）（PMMA）基质中掺入多壳量子点，硫醇配体钝化的作用被证明是在聚合步骤中稳定量子点的基础，防止它们的分解和相对发光猝灭。特别是,通过考虑无机锌硫族化物层的两个表面钝化来研究界面化学的作用，这使我们能够改善光学性能，和有机硫醇配体钝化，这是确保纳米晶体在原位自由基聚合过程中的化学稳定性的基础。这样,有可能生产银-硒化铟QD-PMMA复合材料，表现出明亮的红色发光和高透明度，使它们有希望在光子学的潜在应用。最后,证明了新型的硒化银铟QD-PMMA复合材料可以用作生产红色发光二极管的有效颜色转换层。
