4 years ago

Facile, one-pot and scalable synthesis of highly emissive aqueous-based Ag,Ni:ZnCdS/ZnS core/shell quantum dots with high chemical and optical stability.

Faraji, Soleiman-Beigi, Soheyli, Sahraei
We report here a one pot, mild and low cost aqueous-based synthetic route for preparation of colloidally stable and highly luminescent dual-doped Ag,Ni:ZnCdS/ZnS core/shell quantum dots (QDs). The pure dopant emission of the Ni-doped core/shell quantum dots was found to be highly effected at the presence of second dopant ion (Ag+). Results showed that the PL emission intensity increases while its peak position experiences an obvious blue shift with increasing the content of Ag+ ions. Regarding the optical observations, we simply provide a scheme for absorption-recombination processes of the carriers through impurity centers. To obtain an optimum conditions with better emission characteristic, we also study the effect of different reaction parameters such as: refluxing temperature, core and shell solutions pH, molar ratio of the dopant ions (Ni:(Zn+Cd) and Ag:(Zn+Cd)), and concentration of the core and shell precursors. Nonetheless, the most effective parameter is the presence of the ZnS shell with suitable amount to eliminate the surface trap states and enhance their emission intensity. It can also, improve the bio-compatibility of the prepared QDs by restricting the Cd2+ toxic ions inside the core of the QDs. The present suggested route was also yielded to remarkable optical and chemical stability of the colloidal QDs which introduce them as a decent kind of nano-scale structures for light emitting applications, especially in the biological technologies. The suggested process has also this interesting potential to be scaled-up while remaining the emission characteristics and structural quality which is inevitable for industrial applications in optoelectronic devices.

Publisher URL: http://doi.org/10.1088/1361-6528/aa92b2

DOI: 10.1088/1361-6528/aa92b2

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