Volume 250, 2024

Spectrally narrow band-edge photoluminescence from AgInS2-based core/shell quantum dots for electroluminescence applications

Abstract

This study presents a facile synthesis of cadmium-free ternary and quaternary quantum dots (QDs) and their application to light-emitting diode (LED) devices. AgInS2 ternary QDs, developed as a substitute for cadmium chalcogenide QDs, exhibited spectrally broad photoluminescence due to intrinsic defect levels. Our group has successfully achieved narrow band-edge PL by a coating with gallium sulfide shell. Subsequently, an intrinsic difficulty in the synthesis of multinary compound QDs, which often results in unnecessary byproducts, was surmounted by a new approach involving the nucleation of silver sulfide followed by material conversion to the intended composition (silver indium gallium sulfide). By fine-tuning this reaction and bringing the starting material closer to stoichiometric compositional ratios, atom economy was further improved. These QDs have been tested in LED applications, but the standard device encountered a significant defective emission that would have been eliminated by the gallium sulfide shells. This problem is addressed by introducing gallium oxide as a new electron transport layer.

Graphical abstract: Spectrally narrow band-edge photoluminescence from AgInS2-based core/shell quantum dots for electroluminescence applications

Associated articles

Article information

Article type
Paper
Submitted
19 jul. 2023
Accepted
01 sep. 2023
First published
02 sep. 2023

Faraday Discuss., 2024,250, 281-297

Spectrally narrow band-edge photoluminescence from AgInS2-based core/shell quantum dots for electroluminescence applications

T. Uematsu, R. Izumi, S. Sugano, R. Sugano, T. Hirano, G. Motomura, T. Torimoto and S. Kuwabata, Faraday Discuss., 2024, 250, 281 DOI: 10.1039/D3FD00142C

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