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Open AccessCommunication

The Composition-Dependent Photoluminescence Properties of Non-Stoichiometric ZnxAgyInS1.5+x+0.5y Nanocrystals

1
State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang 550014, Guizhou, China
2
Department of Chemistry, School of Basic Medical Science, Guizhou Medical University, 9 Beijing Road, Guiyang 550004, Guizhou, China
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(7), 439; https://doi.org/10.3390/mi10070439
Received: 24 May 2019 / Revised: 18 June 2019 / Accepted: 24 June 2019 / Published: 1 July 2019
(This article belongs to the Special Issue Nanostructured Light-Emitters)
A facile hot injection approach to synthesize high-quality non-stoichiometric ZnxAgyInS1.5+x+0.5y nanocrystals (NCs) in the size range of 2.8–3.1 nm was presented. The fluorescence spectra had single band gap features, and indicated the formation of alloy states rather than simple composite structures. The chemical compositions, photoluminescence (PL) emission wavelengths, and quantum yields of ZnxAgyInS1.5+x+0.5y nanocrystals were significantly influenced by the concentration of an organic capping agent. The appropriate proportion of 1-dodecanthiol in the precursor prevented the precipitation, increased the fluorescence quantum yield, and improved their optical properties. The proper ratio of capping agent allowed Zn, Ag, and In to form a better crystallinity and compositional homogeneity of ZnxAgyInS1.5+x+0.5y nanocrystals. The photoluminescence was tunable from blue to red in the range of 450–700 nm as the Ag content changed independently. The PL and absorption spectra of ZnxAgyInS1.5+x+0.5y nanocrystals showed a significant blue shift with the decrease of Ag content in the precursor. As there were no obvious differences on the average particle sizes of ZnxAgyInS1.5+x+0.5y samples, these results fully revealed the composition-dependent photoluminescence properties of ZnxAgyInS1.5+x+0.5y nanocrystals. The relative quantum yield reached 35%. The fluorescence lifetimes (τ1=115–148 ns and τ2=455–483 ns) were analogous to those of AgInS2 and (AgIn)xZn2(1−x)S2. View Full-Text
Keywords: nanoparticles; luminescence; non-stoichiometric ZnxAgyInS1.5+x+0.5y nanocrystals; photoluminescence properties; tunable fluorescence emission; one-pot approach nanoparticles; luminescence; non-stoichiometric ZnxAgyInS1.5+x+0.5y nanocrystals; photoluminescence properties; tunable fluorescence emission; one-pot approach
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MDPI and ACS Style

Feng, J.; Yang, X.; Li, R.; Yang, X.; Feng, G. The Composition-Dependent Photoluminescence Properties of Non-Stoichiometric ZnxAgyInS1.5+x+0.5y Nanocrystals. Micromachines 2019, 10, 439.

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