Gallium incorporation in blue-emitting In1−xGaxP alloy quantum dots facilitated by monomeric gallium precursors

Abstract

Demand for environmentally friendly quantum dots (QDs) in wide color-gamut displays has led to successful development of red- and green-emitting InP QDs with outstanding optical properties. While progress in developing blue-emitting variants remains challenging, In1−xGaxP alloy QDs have recently garnered attention as blue emitters. However, Ga incorporation in these In1−xGaxP QDs is hindered by the limited reactivity of conventional gallium halide-derived precursors having a dimeric molecular structure. Here, we adopt trimethylgallium which yields monomeric gallium carboxylates as a Ga precursor in the colloidal synthesis of In1−xGaxP QDs. This approach promotes efficient Ga incorporation into In1−xGaxP QDs with narrow size distributions. The use of zinc chloride and oleylamine for ZnS shell growth on the In1−xGaxP cores further adjusts the photoluminescence (PL) wavelength to the blue range and enhances PL quantum yield. The resulting In1−xGaxP/ZnS core/shell QDs exhibit a peak emission at 470 nm, 67% of photoluminescence quantum yield, and 40 nm of emission linewidth. Successful employment of these QDs into light-emitting diodes demonstrates their potential as a blue electroluminescent emitter for future QD displays.

Graphical abstract: Gallium incorporation in blue-emitting In1−xGaxP alloy quantum dots facilitated by monomeric gallium precursors

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Article information

Article type
Research Article
Submitted
28 Jan 2025
Accepted
18 Mar 2025
First published
18 Mar 2025
This article is Open Access
Creative Commons BY-NC license

Inorg. Chem. Front., 2025, Advance Article

Gallium incorporation in blue-emitting In1−xGaxP alloy quantum dots facilitated by monomeric gallium precursors

T. Kim, S. Kim, S. Lee, J. Park, H. Lee and D. C. Lee, Inorg. Chem. Front., 2025, Advance Article , DOI: 10.1039/D5QI00302D

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