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首页> 外文期刊>Advanced Materials >CsPbBr_3 Quantum Dots 2.0: Benzenesulfonic Acid Equivalent Ligand Awakens Complete Purification
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CsPbBr_3 Quantum Dots 2.0: Benzenesulfonic Acid Equivalent Ligand Awakens Complete Purification

机译：CsPbBr_3量子点2.0：苯磺酸等效配体唤醒完整纯化

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摘要

The stability and optoelectronic device performance of perovskite quantum dots (Pe-QDs) are severely limited by present ligand strategies since these ligands exhibit a highly dynamic binding state, resulting in serious complications in QD purification and storage. Here, a "Br-equivalent" ligand strategy is developed in which the proposed strong ionic sulfonate heads, for example, benzenesulfonic acid, can firmly bind to the exposed Pb ions to form a steady binding state, and can also effectively eliminate the exciton trapping probability due to bromide vacancies. From these two aspects, the sulfonate heads play a similar role as natural Br ions in a perfect perovskite lattice. Using this approach, high photoluminescence quantum yield (PL QY) > 90% is facilely achieved without the need for amine-related ligands. Furthermore, the prepared PL QYs are well maintained after eight purification cycles, more than five months of storage, and high-flux photo-irradiation. This is the first report of high and versatile stabilities of Pe-QD, which should enable their improved application in lighting, displays, and biologic imaging.
机译：钙钛矿量子点（Pe-QDs）的稳定性和光电器件性能受到目前的配体策略的严重限制，因为这些配体表现出高度动态的结合状态，从而导致QD纯化和储存方面的严重并发症。在此，开发了一种“溴当量”配体策略，其中所提出的强离子磺酸根（例如苯磺酸）可以牢固地与暴露的Pb离子结合，形成稳定的结合状态，并且还可以有效消除激子的俘获溴化物空缺的可能性。从这两个方面来看，磺酸根在完美的钙钛矿晶格中起着与天然溴离子相似的作用。使用这种方法，可以轻松实现> 90％的高光致发光量子产率（PL QY），而无需与胺相关的配体。此外，经过八个纯化周期，超过五个月的储存和高通量光辐照后，制备好的PL QY可以得到很好的维护。这是Pe-QD具有高度稳定性和多功能性的第一份报告，这将使它们在照明，显示器和生物成像中的应用得到改善。

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