Issue 8, 2024

Achieving a near-unity photoluminescence quantum yield and high stability of CsPbI3 nanoplatelets by hydroiodic acid-assisted ligand treatment

Abstract

Perovskite nanoplatelets (NPLs) display excellent photoluminescence (PL) properties and unique shape features, including thickness-dependent bandgap luminescence. However, perovskite NPLs, especially those based on iodides, exhibit poor spectral and phase stability. Herein, we propose a facile strategy to achieve a near-unity PL quantum yield (QY) and high stability of CsPbI3 NPLs by employing hydrogen iodate (HI) for in situ etching-assisted surface modification of the short-chain strongly bound ligand dodecylamine (DDDAm). It is found that HI can etch off the incomplete octahedron [PbI6]4− on the surface of CsPbI3 NPLs. Simultaneously, the excessive use of I ions and the introduction of DDDAm ligands effectively passivate the surface defects of NPLs, significantly improving their radiation recombination rate. As a result, the as-prepared CsPbI3 NPLs exhibit up to 95% PL QY, maintaining PL characteristics even after 87 days of exposure to the atmospheric environment. Conversely, untreated CsPbI3 NPLs display poor phase stability and transform into non-PL features (δ-CsPbI3) after 21 days. As a proof of concept, we fabricated perovskite LEDs (PeLEDs) using these treated CsPbI3 NPLs as luminescent layers for calibration. These PeLEDs showcase bright electroluminescence at 600 nm, with a full width at half maximum of 22 nm and an external quantum efficiency of 2.98%. The effective synthesis strategy using HI-assisted ligand treatment presented here is expected to be extended to the synthesis of other perovskite NPLs, thereby accelerating the integration of perovskite NPLs in optoelectronic technology.

Graphical abstract: Achieving a near-unity photoluminescence quantum yield and high stability of CsPbI3 nanoplatelets by hydroiodic acid-assisted ligand treatment

Supplementary files

Article information

Article type
Research Article
Submitted
18 jan 2024
Accepted
08 mar 2024
First published
10 mar 2024

Inorg. Chem. Front., 2024,11, 2392-2401

Achieving a near-unity photoluminescence quantum yield and high stability of CsPbI3 nanoplatelets by hydroiodic acid-assisted ligand treatment

Z. Li, Y. Song, S. Cao, K. Xing, Z. Du, B. Zou and J. Zhao, Inorg. Chem. Front., 2024, 11, 2392 DOI: 10.1039/D4QI00168K

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