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The luminescence properties of CsPbxM1−xBr3 perovskite nanocrystals transformed from Cs4PbBr6 mediated by various divalent bromide MBr2 salts

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Abstract

A novel high concentration doping method based on the transformation from Cs4PbBr6 nanocrystals (NCs), which reacted with divalent metal bromide MBr2, to CsPbxM1−xBr3 NCs was developed. Two types of M2+ and Zn2+ which cannot emit light and Mn2+ and Eu2+ which can be used as the luminous centres, were chosen to trigger the transformation of Cs4PbBr6 NCs to CsPbxM1−xBr3 NCs. CsPbxZn1−xBr3 NCs maintained high photoluminescence quantum yields (PLQY) (>75%) and had good dispersion in hexane without obvious dissolution or agglomeration after two weeks. By adjusting the reaction temperature, the intrinsic band edge luminescence and the emission of Mn2+ ions CsPbxMn1−xBr3 NCs show different colours of light from green, green-yellow, pink, and orange-red to purple under an excitation of 365 nm. CsPbxEu1−xBr3 NCs were synthesized for the first time, and a weak luminescence around 618 nm from Eu3+ was detected in addition to the band edge luminescence of NCs. X-ray photoelectron spectroscopy (XPS) data showed that Zn2+, Mn2+ and Eu3+ (Eu2+) doping concentrations are up to 80%, 75% and 50%, respectively. We also analysed the doping mechanism and compared the new method with the traditional high temperature injection method. The lead-depleted perovskite NCs transformed from Cs4PbBr6 can provide a feasible pathway to reduce the lead toxicity of perovskite NCs and expand their applications.

Graphical abstract: The luminescence properties of CsPbxM1−xBr3 perovskite nanocrystals transformed from Cs4PbBr6 mediated by various divalent bromide MBr2 salts

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Publication details

The article was received on 05 Dec 2018, accepted on 30 Jan 2019 and first published on 01 Feb 2019


Article type: Paper
DOI: 10.1039/C8NR09845J
Citation: Nanoscale, 2019, Advance Article

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    The luminescence properties of CsPbxM1−xBr3 perovskite nanocrystals transformed from Cs4PbBr6 mediated by various divalent bromide MBr2 salts

    Z. Shen, B. Qiao, Z. Xu, D. Song, D. Gao, P. Song, J. Cao, Q. Bai, Y. Wu and S. Zhao, Nanoscale, 2019, Advance Article , DOI: 10.1039/C8NR09845J

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