Synthesis of perovskites that exhibit pure‐blue emission with high photoluminescence quantum yield (PLQY) in both nanocrystal solutions and nanocrystal‐only films presents a significant challenge. In this work, a room‐temperature method is developed to synthesize ultrasmall, monodispersed, Sn‐doped methylammonium lead bromide (MAPb1‐xSnxBr3) perovskite nanoplatelets (NPLs) in which the strong quantum confinement effect endows pure blue emission (460 nm) and a high quantum yield (87%). Post‐treatment using n‐hexylammonium bromide (HABr) repaired surface defects and thus substantially increased the stability and PLQY (80%) of the NPL films. Concurrently, high‐precision patterned films (200‐µm linewidth) are successfully fabricated by using cost‐effective spray‐coating technology. This research provides a novel perspective for the preparation of high PLQY, highly stable, and easily processable perovskite nanomaterials.

中文翻译：

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超小型二维锡掺杂 MAPbBr3 纳米片可实现明亮的纯蓝色发射


在纳米晶体溶液和纯纳米晶体薄膜中合成具有高光致发光量子产率（PLQY）的纯蓝色发射的钙钛矿提出了重大挑战。在这项工作中，开发了一种室温方法来合成超小、单分散、Sn掺杂的甲基铵溴化铅（MAPb1-xSnxBr3）钙钛矿纳米片（NPL），其中强的量子限制效应赋予纯蓝色发射（460 nm）和高量子产率（87%）。使用正己基溴化铵（HABr）进行后处理修复了表面缺陷，从而显着提高了 NPL 薄膜的稳定性和 PLQY（80%）。同时，通过使用具有成本效益的喷涂技术成功制造了高精度图案化薄膜（200 µm 线宽）。该研究为制备高PLQY、高稳定性、易加工的钙钛矿纳米材料提供了新的视角。