LrgpV1, Hal, Corpus, bibRecord, 000C79

Aqueous route to color-tunable Mn-doped ZnS quantum dots

Identifieur interne : 000C79 ( Hal/Corpus ); précédent : 000C78

Aqueous route to color-tunable Mn-doped ZnS quantum dots

Auteurs : Houcine Labiadh ; Tahar Ben Chaabane ; David Piatkowski ; Sebastian Mackowski ; Jacques Lalevéee ; Jaafar Ghanbaja ; Fadi Aldeek ; Raphaël Schneider

Source :

Materials Chemistry and Physics [ 0254-0584 ] ; 2013-04-01.

RBID : Hal:hal-00843169

English descriptors

mix :
- Chemical synthesis, Luminescence, Nanostructures, Optical properties, Semiconductors.

Abstract

Mn-doped zinc sulfide (Mn:ZnS) quantum dots stabilized by 3-mercaptopropionic acid (MPA) were synthesized at 100°C in basic aqueous solution using the nucleation-doping strategy. The optical properties and structure of the obtained Mn:ZnS d-dots have been characterized by UV-vis, photoluminescence (PL) and time-resolved PL spectroscopies, transmission electron microscopy (TEM), X-ray diffraction (XRD), and electron spin resonance (ESR). The obtained nearly monodisperse Mn:ZnS@MPA QDs were found to be of spherical shape with an average diameter of ca. 2.5 nm and with a zinc-blende crystal structure. By varying the base (LiOH, NaOH, KOH, CsOH) used to deprotonate the MPA ligand and adjust the pH of the aqueous solution to 11, the PL emission wavelengths can be tuned within a relatively large optical window, from 567 to 594 nm. The variations of charge density near the surface of the QDs obtained by changing the cation associated to the MPA ligand and of the dopant location in the ZnS host are at the origin of the PL shifts observed. In order to improve the PL emission efficiency, a ZnS shell was subsequently overcoated around the Mn:ZnS core nanocrystals. With ZnS shell growth, the PL emission wavelength was restricted between 570 and 583 nm but PL quantum efficiency of Mn:ZnS/ZnS core/shell nanocrystals increased up to 18.4 %.

Url:

https://hal.archives-ouvertes.fr/hal-00843169

DOI: 10.1016/j.matchemphys.2013.04.023

Links to Exploration step

Hal:hal-00843169

Le document en format XML

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<front><div type="abstract" xml:lang="en">Mn-doped zinc sulfide (Mn:ZnS) quantum dots stabilized by 3-mercaptopropionic acid (MPA) were synthesized at 100°C in basic aqueous solution using the nucleation-doping strategy. The optical properties and structure of the obtained Mn:ZnS d-dots have been characterized by UV-vis, photoluminescence (PL) and time-resolved PL spectroscopies, transmission electron microscopy (TEM), X-ray diffraction (XRD), and electron spin resonance (ESR). The obtained nearly monodisperse Mn:ZnS@MPA QDs were found to be of spherical shape with an average diameter of ca. 2.5 nm and with a zinc-blende crystal structure. By varying the base (LiOH, NaOH, KOH, CsOH) used to deprotonate the MPA ligand and adjust the pH of the aqueous solution to 11, the PL emission wavelengths can be tuned within a relatively large optical window, from 567 to 594 nm. The variations of charge density near the surface of the QDs obtained by changing the cation associated to the MPA ligand and of the dopant location in the ZnS host are at the origin of the PL shifts observed. In order to improve the PL emission efficiency, a ZnS shell was subsequently overcoated around the Mn:ZnS core nanocrystals. With ZnS shell growth, the PL emission wavelength was restricted between 570 and 583 nm but PL quantum efficiency of Mn:ZnS/ZnS core/shell nanocrystals increased up to 18.4 %.</div>
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<abstract xml:lang="en">Mn-doped zinc sulfide (Mn:ZnS) quantum dots stabilized by 3-mercaptopropionic acid (MPA) were synthesized at 100°C in basic aqueous solution using the nucleation-doping strategy. The optical properties and structure of the obtained Mn:ZnS d-dots have been characterized by UV-vis, photoluminescence (PL) and time-resolved PL spectroscopies, transmission electron microscopy (TEM), X-ray diffraction (XRD), and electron spin resonance (ESR). The obtained nearly monodisperse Mn:ZnS@MPA QDs were found to be of spherical shape with an average diameter of ca. 2.5 nm and with a zinc-blende crystal structure. By varying the base (LiOH, NaOH, KOH, CsOH) used to deprotonate the MPA ligand and adjust the pH of the aqueous solution to 11, the PL emission wavelengths can be tuned within a relatively large optical window, from 567 to 594 nm. The variations of charge density near the surface of the QDs obtained by changing the cation associated to the MPA ligand and of the dopant location in the ZnS host are at the origin of the PL shifts observed. In order to improve the PL emission efficiency, a ZnS shell was subsequently overcoated around the Mn:ZnS core nanocrystals. With ZnS shell growth, the PL emission wavelength was restricted between 570 and 583 nm but PL quantum efficiency of Mn:ZnS/ZnS core/shell nanocrystals increased up to 18.4 %.</abstract>
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Aqueous route to color-tunable Mn-doped ZnS quantum dots

Aqueous route to color-tunable Mn-doped ZnS quantum dots

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