Abstract All-inorganic lead halide perovskite nanocrystals (NCs) as new emerging semiconducting luminescent materials have attracted tremendous attention for designing optoelectronic devices. We have synthesized high quality of the CsPbX3 NCs with tunable entire visible spectral region by a modified lower temperature method, featured with facile, low-cost and easily operating in an open environment without vacuumization or glovebox system. Besides, we have investigated the incorporation of Ni and K ions into CsPbX3 NCs by adjusting all kinds of composition concentration from halogen salts, based on above mentioned preparation method. The absolute photoluminescence quantum yields (PLQYs) of doped CsPbX3 NCs with different dopant (Ni or K ions) concentration were discussed. It is found that a certain amount of doping is beneficial for suppressing the defects and improving the lattice structure of nanocrystals, whereas an excessive dopant may induce quenching centers of the emission. In addition, a glorious absolute PLQYs of doped CsPbX3 NCs can be obtained by our method, especially for CsPbBr3 and CsPbI3 NCs, and nearly reach 80%.

中文翻译：

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Ni和K离子掺杂的CsPbX3 NCs通过一种简便的合成方法在环境空气中改善发光性能

摘要 全无机卤化铅钙钛矿纳米晶体（NCs）作为新兴的半导体发光材料，在光电器件设计方面引起了极大的关注。我们通过改进的低温方法合成了具有可调谐整个可见光谱区域的高质量 CsPbX3 NC，其特点是简便、低成本且易于在没有真空或手套箱系统的开放环境中操作。此外，基于上述制备方法，我们通过调节卤素盐的各种成分浓度，研究了 Ni 和 K 离子向 CsPbX3 NCs 的掺入。讨论了具有不同掺杂剂（Ni 或 K 离子）浓度的掺杂 CsPbX3 NCs 的绝对光致发光量子产率（PLQY）。发现一定量的掺杂有利于抑制缺陷和改善纳米晶的晶格结构，而过量的掺杂可能会导致发射猝灭中心。此外，通过我们的方法可以获得掺杂 CsPbX3 NCs 的光辉绝对 PLQY，特别是对于 CsPbBr3 和 CsPbI3 NCs，几乎达到 80%。