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Efficient luminescence from CsPbBr3 nanoparticles embedded in Cs4PbBr6

Research output: Contribution to journalArticle

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  • Embargoed (until 21/08/21)

Author(s)

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

School/Research organisations

Abstract

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.

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Details

Original languageEnglish
Pages (from-to)7637-7642
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume11
Issue number18
Early online date21 Aug 2020
DOIs
Publication statusPublished - 17 Sep 2020

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