Recently, lead–tin-based alloyed halide perovskite quantum dots (QDs) with improved stability and less toxicity have been introduced. However, the perovskite QDs containing tin are still unstable and exhibit low photoluminescence quantum yields (PLQYs), owing to the presence of defects in the alloyed system. Here, we have attempted to introduce sulfur anions (S^2–) into the host lattice (MAPb_0.75Sn_0.25Br₃) as a promising route to stable alloyed perovskite QDs with improved stability and PLQY. In this study, we used elemental sulfur as a sulfur precursor. The successful incorporation of sulfur anions into the host lattice resulted in a highly improved PLQY (>75% at room temperature), which is believed to be due to a reduction in the defect-related non-radiative recombination centers present in the host lattice. Furthermore, we found that the emission property could be tuned between the bright green and cyan-bluish regions without compromising on color quality. This work invigorates the perovskite research community to prepare stable, bright, and color-tunable alloyed inorganic–organic perovskite QDs without compromising on their phases and color quality, which can lead to considerable advances in display technology.

中文翻译：

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铅锡合金无机有机卤化物钙钛矿量子点的稳定性

最近，已引入具有改进的稳定性和较低毒性的铅锡基合金卤化物钙钛矿量子点（QD）。然而，由于合金体系中存在缺陷，含锡的钙钛矿量子点仍然不稳定，并显示出低的光致发光量子产率（PLQYs）。在这里，我们尝试将硫阴离子（S ^2–）引入主晶格（MAPb _0.75 Sn _0.25 Br ₃），这是获得稳定的，具有改善的PLQY的稳定合金钙钛矿QD的有前途的途径。在这项研究中，我们使用元素硫作为硫的前体。成功地将硫阴离子掺入主体晶格中导致高度改善的PLQY（在室温下> 75％），这被认为是由于主体晶格中与缺陷相关的非辐射重组中心的减少所致。此外，我们发现可以在不影响颜色质量的情况下在明亮的绿色和青蓝色之间调整发射特性。这项工作为钙钛矿研究界注入了新的活力，以制备稳定，明亮和颜色可调的无机-有机钙钛矿QD，而又不影响其相位和颜色质量，这可以导致显示技术的显着进步。