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

doi:10.1021/acs.chemmater.9b03529

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

AIMMS

Research output: Contribution to Journal › Article › Academic › peer-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 language	English
Pages (from-to)	9140-9147
Number of pages	8
Journal	Chemistry of Materials
Volume	31
Issue number	21
DOIs	https://doi.org/10.1021/acs.chemmater.9b03529
Publication status	Published - 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.

Funders	Funder number
The Netherlands Organization of Scientific Research
Horizon 2020 Framework Programme
Nederlandse Organisatie voor Wetenschappelijk Onderzoek	723.013.002
Horizon 2020	2014-2020, 691185

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 6 Clean Water and Sanitation

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10.1021/acs.chemmater.9b03529

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Cite this

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title = "Alkyl phosphonic acids deliver CsPbBr3 Nanocrystals with high photoluminescence quantum yield and truncated octahedron shape",

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.",

author = "Baowei Zhang and Luca Goldoni and Juliette Zito and Zhiya Dang and Guilherme Almeida and Francesco Zaccaria and \{De Wit\}, Jur and Ivan Infante and \{De Trizio\}, Luca and Liberato Manna",

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doi = "10.1021/acs.chemmater.9b03529",

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T1 - Alkyl phosphonic acids deliver CsPbBr3 Nanocrystals with high photoluminescence quantum yield and truncated octahedron shape

AU - Zhang, Baowei

AU - Goldoni, Luca

AU - Zito, Juliette

AU - Dang, Zhiya

AU - Almeida, Guilherme

AU - Zaccaria, Francesco

AU - De Wit, Jur

AU - Infante, Ivan

AU - De Trizio, Luca

AU - Manna, Liberato

PY - 2019/10/14

Y1 - 2019/10/14

N2 - 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.

AB - 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.

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