Issue 24, 2022

Colloidal synthesis of size-confined CsAgCl2 nanocrystals: implications for electroluminescence applications

Abstract

Because of their non-toxic properties and similar ionic radius to that of Pb2+, silver ion (Ag+)-containing perovskite derivatives have become an important class of Pb-free alternatives that are competitive for a variety of optoelectronic applications. Although great success has been achieved in producing Ag+-containing nanocrystals (NCs), such as Cs2AgInCl6 and Cs2AgBiCl6, colloidal synthesis of pure Ag-based emitters has remained challenging. Herein, we have devised a facile europium chloride (EuCl3)-based route to CsAgCl2 NCs with a tunable particle size and desirable warm white-light emission. To enhance the optical properties of CsAgCl2, we further demonstrate a trace doping strategy with Sb3+, which improves the quantum efficiency of the resulting NCs from 16% to 39%. Moreover, the addition of Sb3+ was found to significantly reduce the particle size of the CsAgCl2 NCs from a few hundred nanometers to several nanometers as a result of the reduced surface energy, paving the way for the formation of emissive layers with a well-controlled thickness and improved uniformity. Prototype electroluminescence devices fabricated using these nano-emitters exhibit favorable warm white-light (or yellow) emission, which opens up new avenues to develop single-component warm white light-emitting diodes.

Graphical abstract: Colloidal synthesis of size-confined CsAgCl2 nanocrystals: implications for electroluminescence applications

Supplementary files

Article information

Article type
Research Article
Submitted
29 Sep 2022
Accepted
20 Okt 2022
First published
25 Okt 2022

Mater. Chem. Front., 2022,6, 3669-3677

Colloidal synthesis of size-confined CsAgCl2 nanocrystals: implications for electroluminescence applications

S. Ji, X. Meng, X. Wang, T. Bai, R. Zhang, B. Yang, K. Han, J. Jiang and F. Liu, Mater. Chem. Front., 2022, 6, 3669 DOI: 10.1039/D2QM00997H

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