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 1 2024
Accepted
08 3 2024
First published
10 3 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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements