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Efficient Luminescence from CsPbBr3 Nanoparticles Embedded in Cs4PbBr6.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-08-21 , DOI: 10.1021/acs.jpclett.0c02321
Zhen Bao,Yu-Jui Tseng,Wenwu You,Wei Zheng,Xueyuan Chen,Sebastian Mahlik,Agata Lazarowska,Tadeusz Lesniewski,Marek Grinberg,Chonggeng Ma,Weihao Sun,Wuzong Zhou,Ru-Shi Liu,J Paul Attfield

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:

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。
更新日期:2020-09-18
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