Highly efficient green emission of Cs₄PbBr₆ has been attributed to intermediate states formed by embedded CsPbBr₃ nanocrystals or defects. However, direct experimental confirmation of the presence of such nano-emitters is not straightforward and the emission mechanism remains elusive. By using cathodoluminescence (CL) imaging with a high spatial resolution, we demonstrate that CsPbBr₃ nanocrystals within the Cs₄PbBr₆ matrix contribute to the green emission, exhibiting optical behavior distinct from the matrix. Additionally, we explore its potential as an electron beam scintillator, given its high CL intensity and exceptionally short lifetime.

中文翻译：

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Cs4PbBr6 的阴极发光光谱和寿命图：快速寿命及其闪烁体应用

_{Cs 4} PbBr ₆的高效绿光发射归因于嵌入的CsPbBr ₃纳米晶体或缺陷形成的中间态。然而，直接实验证实这种纳米发射体的存在并不简单，而且发射机制仍然难以捉摸。通过使用具有高空间分辨率的阴极发光 (CL) 成像，我们证明Cs ₄ PbBr _{6基质内的 CsPbBr 3}纳米晶体有助于绿光发射，表现出与基质不​​同的光学行为。此外，鉴于其高化学发光强度和极短的寿命，我们还探索了其作为电子束闪烁体的潜力。