Aqueous synthesis of highly luminescent ternary alloyed Mn-doped ZnSeS quantum dots capped with 2-mercaptopropionic acid - Université de Lorraine Access content directly
Journal Articles Journal of Alloys and Compounds Year : 2020

Aqueous synthesis of highly luminescent ternary alloyed Mn-doped ZnSeS quantum dots capped with 2-mercaptopropionic acid

Abstract

Highly photoluminescent and water dispersible ternary alloyed Mn-doped ZnSeS and core/shell Mn:ZnSeS/ZnS quantum dots (QDs) with pure dopant emission were synthesized through a simple aqueous route using thiolactic acid (2-MPA) as a capping ligand. Transmission electron microscopy and X-ray diffraction show that Mn:ZnSeS nanocrystals are of spherical shape, with a diameter of 2.4 nm and a cubic zinc blende structure. With the overcoating of the ZnS shell, the particle size increases to 3.7 nm, which confirms the epitaxial growth of the shell on Mn:ZnSeS cores. The photoluminescence (PL) quantum yield depends on the Mn loading and reaches 22% for Mn:ZnSeS cores doped with 10% Mn and 41% after the growth of ZnS at the surface of the cores due to the effective elimination of surface-trap states. Mn:ZnSeS QDs exhibit also long PL lifetimes (up to 681 μs) indicating that the emission originates from the spin forbidden Mn 2+ 4 T 1 → 6 A 1 transition. Electron paramagnetic resonance and X-ray photoelectron spectroscopy results suggest that Mn 2+ ions 2 are located at the interface of core/shell Mn:ZnSeS/ZnS QDs. Further, the stability of Mn:ZnSeS/ZnS QDs was also investigated along with their transfer in organic phase using octanethiol.
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Dates and versions

hal-03087423 , version 1 (06-01-2021)

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Attribution - NonCommercial - NoDerivatives

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Salima Mabrouk, Hervé Rinnert, Lavinia Balan, Sébastien Blanchard, Jordane Jasniewski, et al.. Aqueous synthesis of highly luminescent ternary alloyed Mn-doped ZnSeS quantum dots capped with 2-mercaptopropionic acid. Journal of Alloys and Compounds, 2020, 858, pp.158315. ⟨10.1016/j.jallcom.2020.158315⟩. ⟨hal-03087423⟩
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