Issue 29, 2022

Amino-acid-directed formation of quasi-zero-dimensional perovskites for high-purity blue and red luminescence

Abstract

Spectral tuning in lead halide perovskite semiconductors is generally achieved by mixing halide compositions or by quantum confinement effects. However, mixed-halide perovskites exhibit undesirable phase separation during optical and electrical excitations, leading to spectral instability. Quantum confinement in pure-halide perovskite nanocrystals circumvents this problem, but requires synthetic protocols that involve high loading of long-chain insulating ligands. Here, we report a unique formation of quantum-confined perovskite through a one-step solution-casting process. This is achieved by the implementation of a short-chain 3-ammonium propionic acid (3-APA+) additive in the precursor solution, which directs quantum-confined nano-domains to assemble in situ during film formation. The bidentate amino and carboxylate functional groups of 3-APA+, at an operational three-carbon spacing, coordinate effectively to adjacent halide and cesium surface atoms, and thus stabilizes the formation of quasi-zero dimensional nano-domains within an otherwise continuous thin film (i.e. embedded quantum dots within bulk film). This process allows precise spectral tuning in both pure-bromide and pure-iodide perovskite thin films to give high-purity blue and red luminescence, respectively. The resulting electroluminescent diodes exhibit remarkable spectral stability at 468 nm and 638 nm, which could find functional applications in trichromatic electronic color displays.

Graphical abstract: Amino-acid-directed formation of quasi-zero-dimensional perovskites for high-purity blue and red luminescence

Supplementary files

Article information

Article type
Communication
Submitted
19 may. 2022
Accepted
11 jul. 2022
First published
12 jul. 2022
This article is Open Access
Creative Commons BY license

J. Mater. Chem. C, 2022,10, 10464-10472

Amino-acid-directed formation of quasi-zero-dimensional perovskites for high-purity blue and red luminescence

B. Zhu, T. Wang and Z. Tan, J. Mater. Chem. C, 2022, 10, 10464 DOI: 10.1039/D2TC02077G

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