Alkyl phosphonic acids deliver CsPbBr3 Nanocrystals with high photoluminescence quantum yield and truncated octahedron shape

Baowei Zhang, Luca Goldoni, Juliette Zito, Zhiya Dang, Guilherme Almeida, Francesco Zaccaria, Jur De Wit, Ivan Infante, Luca De Trizio*, Liberato Manna

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

We devised a colloidal approach for the synthesis of CsPbBr3 nanocrystals (NCs) in which the only ligands employed are alkyl phosphonic acids. Compared to more traditional syntheses of CsPbBr3 NCs, the present scheme delivers NCs with the following distinctive features: (i) The NCs do not have cubic but truncated octahedron shape enclosed by Pb-terminated facets. This is a consequence of the strong binding affinity of the phosphonate groups toward Pb2+ ions. (II) The NCs have near unity photoluminescence quantum yields (PLQYs), with no need of postsynthesis treatments, indicating that alkyl phosphonic acids are effectively preventing the formation of surface traps. (III) Unlike NCs coated with alkylammonium or carboxylate ligands, the PLQY of phosphonate coated NCs remains constant upon dilution, suggesting that the ligands are tightly bound to the surface.

Original languageEnglish
Pages (from-to)9140-9147
Number of pages8
JournalChemistry of Materials
Volume31
Issue number21
DOIs
Publication statusPublished - 14 Oct 2019

Funding

We would like to thank M. Prato and G. Pugliese for carrying out the XPS and DLS measurements, respectively. We would like to thank also M. Imran for his help in the TEM analysis. We would like to thank Valerio Pinchetti of the Università degli Studi di Milano-Bicocca for measuring the PLQY of our NC systems. I.I. acknowledges The Netherlands Organization of Scientific Research (NWO) through the Innovational Research Incentive (Vidi) Scheme (Grant No. 723.013.002). The computational work was carried out on the Dutch national e-infrastructure with the support of the SURF Cooperative. We also acknowledge funding from the programme for research and Innovation Horizon 2020 (2014-2020) under the Marie Skłodowska-Curie Grant Agreement COMPASS No. 691185.

FundersFunder number
The Netherlands Organization of Scientific Research
Horizon 2020 Framework Programme
Nederlandse Organisatie voor Wetenschappelijk Onderzoek723.013.002
Horizon 20202014-2020, 691185

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