Issue 23, 2024

Multifunctional ammonium salts synergizing etching and passivation capability enable efficient deep-blue CsPbBr3 nanoplates

Abstract

Two-dimensional CsPbBr3 nanoplates (NPLs) are highly promising blue emitters due to their precisely tunable emission wavelength by adjusting the thickness. However, synthesizing high-performance deep-blue emissive CsPbBr3 NPLs with fewer monolayers remains challenging. Here, multifunctional ligands of 2,6-diaminopyridinium hydrobromide (DaPyBr) with multiple coordination sites were designed and synthesized to attenuate the thickness of blue CsPbBr3 NPLs and suppress surface defects. DaPyBr serving both as a Lewis acid and a Lewis base possesses the dual functions of etching and passivation. It can detach the outer defect layers of CsPbBr3 NPLs reducing the thickness to 3 monolayers and passivate inner [PbBr6]4− layers suppressing the surface defects. Ultimately, CsPbBr3 NPLs treated by DaPyBr achieved a near-unity photoluminescence quantum yield at 456 nm. The target NPLs gained long-term storage stability and outstanding resistance to polar solvents. A bright deep-blue pattern display with commendable luminescence stability is achieved via aerosol printing technology.

Graphical abstract: Multifunctional ammonium salts synergizing etching and passivation capability enable efficient deep-blue CsPbBr3 nanoplates

Supplementary files

Article information

Article type
Paper
Submitted
29 мар 2024
Accepted
16 май 2024
First published
17 май 2024

J. Mater. Chem. C, 2024,12, 8302-8308

Multifunctional ammonium salts synergizing etching and passivation capability enable efficient deep-blue CsPbBr3 nanoplates

Y. Wang, S. Wang, Z. Qin, J. Zhou, S. Gu, X. Li and H. Liu, J. Mater. Chem. C, 2024, 12, 8302 DOI: 10.1039/D4TC01261E

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