Abstract
The application of polymers to replace oleylamine (OLA) and oleic acid (OA) as ligands for perovskite nanocrystals is an effective strategy to improve their stability and durability especially for the solution-based processing. Herein, we report a mechanosynthesis of lead bromide perovskite nanoparticles (NPs) stabilized by partially hydrolyzed poly(methyl methacrylate) (h-PMMA) and high-molecular-weight highly-branched poly(ethylenimine) (PEI-25K). The as-synthesized NP solutions exhibited green emission centered at 516 nm, possessing a narrow full-width at half-maximum of 17 nm and as high photoluminescence quantum yield (PL QY) as 85%, while showing excellent durability and resistance to polar solvents, e.g., methanol. The colloids of polymer-stabilized NPs were directly processable to form stable and strongly-emitting thin films and solids, making them attractive as gain media. Furthermore, the roles of h-PMMA and PEI-25K in the grinding process were studied in depth. The h-PMMA can form micelles in the grinding solvent of dichloromethane to act as size-regulating templates for the growth of NPs. The PEI-25K with large amounts of amino groups induced significant enrichment of PbBr2 in the reaction mixture, which in turn caused the formation of CsPb2Br5-mPbBr2 and CsPbBr3-Cs4PbBr6-nCsBr NPs. The presence of CsPbBr3-Cs4PbBr6-nCsBr NPs was responsible for the high PL QY, as the Cs4PbBr6 phase with a wide energy bandgap can passivate the surface defects of the CsPbBr3 phase. This work describes a direct and facile mechanosynthesis of polymer-coordinated perovskite NPs and promotes in-depth understanding of the formation and phase conversion for perovskite NPs in the grinding process.
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Acknowledgements
G. J. acknowledges the China Scholarship Council (No. 201706740088). This work was partly supported by the bilateral IB-BMBF-TÜBITAK Project ColMiBack (01DL20002) and DFG project EY 16/14-3. O. E. acknowledges TÜBITAK for the financial support through BIDEB-2211 program. H. V. D. gratefully acknowledges support from TUBA. The use of the HZDR Ion Beam Center TEM facilities and the funding of TEM Talos by the German Federal Ministry of Education of Research (BMBF), Grant No. 03SF0451, in the framework of HEMCP are acknowledged. M. G. acknowledges the Swiss National Science Foundation (SNF) and the German Research Foundation (DFG EY 16/18-2) for financial support. W. W. received supports from Jiangsu Overseas Visiting Scholar Program for University Prominent Young & Middle-aged Teachers and Presidents. X. F. acknowledges the China Scholarship Council (No. 201606340161). J. W. received supports from the National Natural Science Foundation of China (No. 21701143). We are very grateful to Prof. Alexander Eychmüller, Dr. Vladimir Lesnyak and Dr. Alexey Shavel for the valuable discussions. We are grateful to Susanne Goldberg for TEM imaging, Franziska Eichler for the instruction to the PL decay measurements. We appreciate Linlin Wang and Dr. Juliane Simmchen for their help with DLS measurements. We thank Dr. André Wolf for his corrections to the draft.
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Mechanosynthesis of polymer-stabilized lead bromide perovskites: insight into the formation and phase conversion of nanoparticles
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Jiang, G., Erdem, O., Hübner, R. et al. Mechanosynthesis of polymer-stabilized lead bromide perovskites: insight into the formation and phase conversion of nanoparticles. Nano Res. 14, 1078–1086 (2021). https://doi.org/10.1007/s12274-020-3152-7
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DOI: https://doi.org/10.1007/s12274-020-3152-7