期刊
MATERIALS CHEMISTRY FRONTIERS
卷 6, 期 24, 页码 3669-3677出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2qm00997h
关键词
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资金
- National Natural Science Foundation of China [22179072, 22088102]
- Natural Science Foundation of Shandong Province [ZR2021QF006, ZR2021QB010]
- Outstanding Youth Science Foundation of Shandong Province [2022HWYQ-006]
- Qilu Youth Scholar Foundation of Shandong University [62460082163114]
In this study, CsAgCl2 nanocrystals with tunable particle size and desirable warm white-light emission were synthesized using europium chloride and cadmium chloride. The quantum efficiency of the nanocrystals was improved by trace doping with antimony (Sb3+).
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.
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