Cs₄PbBr₆ is regarded as an outstanding luminescent material with good thermal stability and optical performance. However, the mechanism of green emission from Cs₄PbBr₆ has been controversial. Here we show that isolated CsPbBr₃ nanoparticles embedded within a Cs₄PbBr₆ matrix give rise to a “normal” green luminescence while superfluorescence at longer wavelengths is suppressed. High-resolution transmission electron microscopy shows that the embedded CsPbBr₃ nanoparticles are around 3.8 nm in diameter and are well-separated from each other, perhaps by a strain-driven mechanism. This mechanism may enable other efficient luminescent composites to be developed by embedding optically active nanoparticles epitaxially within inert host lattices.

中文翻译：

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嵌入Cs4PbBr6的CsPbBr3纳米粒子的高效发光。

Cs ₄ PbBr ₆被认为是一种出色的发光材料，具有良好的热稳定性和光学性能。然而，Cs ₄ PbBr ₆的绿色发射机理一直存在争议。在这里，我们显示嵌入Cs ₄ PbBr ₆基质中的分离的CsPbBr ₃纳米颗粒会产生“正常”绿色发光，而在更长波长处的超荧光被抑制。高分辨率透射电子显微镜显示嵌入的CsPbBr ₃纳米粒子的直径约为3.8 nm，并且可能是通过应变驱动机制彼此良好分离的。该机制可以通过将光学活性纳米颗粒外延嵌入惰性基质晶格中来开发其他有效的发光复合材料。