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Pure Zero-dimensional Cs4PbBr6 Single Crystal Rhombohedral Mircodisk with High Luminescence and Stability

Abstract

Zero-dimensional (0D) perovskite Cs4PbBr6 have been speculated as efficient solid-state emitters through quantum confinement effect. Although several groups have reported strong green luminescence fromCs4PbBr6 powders and nanocrystals, doubts on the fact that the origin of luminescence comes from Cs4PbBr6 itsself or CsPbBr3 impurities have been a point of controversy and a hurdle to further optolectronic decive applications. Here, we develop a facile one-step solution self-assembly method to synthesize pure zero-dimensional rhombohedral Cs4PbBr6 micro-disks (MDs) with high photoluminescence quantum yield (PLQY) of 52% ± 5% and narrow PL full-width at half maximum (FWHM) of 16.8 nm. The obtained rhombohedral MDs are high quality single-crystals evidenced by the XRD and SAED results. We demonstrate that Cs4PbBr6 MDs and CsPbBr3 MDs are phase-separated from each other and the strong green emission comes from Cs4PbBr6 MDs. Power and temperature dependence spectra reveal that the observed strong green luminescence of pure Cs4PbBr6 MDs originated from the direct exciton recombination in the isolated octahedra with a large binding energy of 303.9 meV. Significantly, isolated PbBr64- octahedra separated by Cs+ ion insert is beneficial to maintain the structural stability, depict superior thermal and anion exchange stability. Our study provide an efficient approach to obtain high quality single-crystalline Cs4PbBr6 MDs with high efficient luminescence and stability for further optoelectronic applications.

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Publication details

The article was received on 07 Sep 2017, accepted on 05 Oct 2017 and first published on 05 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP06097A
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Pure Zero-dimensional Cs4PbBr6 Single Crystal Rhombohedral Mircodisk with High Luminescence and Stability

    H. Fu, H. Zhang, Q. Liao, Y. Wu, J. Chen and Q. Gao, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP06097A

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