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Ligand-assisted reduction and reprecipitation synthesis of highly luminescent metal nanoclusters

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Abstract

Solid-state luminescent materials play a key role in fabricating light-emitting diodes (LEDs). Herein, highly luminescent metal nanoclusters (NCs) are synthesized using a ligand-assisted reduction and reprecipitation process. Glutathione (GSH) dissolved in a good solvent (water) is injected into a poor solvent (ethanol in which Cu2+ is dissolved), where the fast reduction of Cu2+ by GSH and the supersaturation-induced aggregation triggered by the solubility change of GSH upon solvent mixing occur. Nanoparticles with diameters of around 50–80 nm embedded with small-sized Cu NCs (around 2 nm) can be obtained and processed into powders simply by drying the solvent. The powders show bright-orange emission with a photoluminescence quantum yield as high as 48%. Nearly monoexponential behavior was observed in the photoluminescence decay profiles of the Cu NCs, which can be attributed to the abundance of metal defect-related states formed with the assistance of coordination between Cu and ethanol. Moreover, white LEDs were fabricated using blue-emissive commercial phosphors and orange-emissive Cu NCs as color converters integrated with UV LED chips.

Graphical abstract: Ligand-assisted reduction and reprecipitation synthesis of highly luminescent metal nanoclusters

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Publication details

The article was received on 03 Oct 2018, accepted on 14 Nov 2018 and first published on 19 Nov 2018


Article type: Paper
DOI: 10.1039/C8NA00268A
Citation: Nanoscale Adv., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    Ligand-assisted reduction and reprecipitation synthesis of highly luminescent metal nanoclusters

    Y. Wang, Y. Shi, T. Li, H. Wang, Y. Li, Y. Xiong, S. Peng and Z. Wang, Nanoscale Adv., 2019, Advance Article , DOI: 10.1039/C8NA00268A

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