Facile synthesis of highly luminescent Mg(II), Cu(I)-codoped CdS/ZnSe core/shell nanoparticles

Magnesium and copper doped CdS/ZnSe (core/shell) nanoparticles were synthesized through direct chemical solution routes in organic solvent. X-ray powder diffraction (XRD) pattern confirmed the mixing of cubic and wurtzite structures. The Mg or Cu-doped CdS shows the obvious blue shift of photolumimescent spectra due to the replacement of Cd ions with Mg or Cu ions. However, the concomitant presence of Mg and Cu, emission peaks relatively shifts to the red range in comparison with that of Cu-doped CdS. The photoluminescent intensity of CdS:Mg,Cu/ZnSe are much higher than that of the undoped CdS and CdS/ZnSe. The PL intensities were also strongly affected by the presence of octadecylamine and increased more than 4 times. The dopant ions, Mg and Cu, play an important role in energy transfer in the lattice. The results shows that CdS:Mg,Cu/ZnSe NPs give not only the luminescences in various region but also the excellent properties of CdS/ZnSe.

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• Mg and Cu were codoped CdS core using chemical precipitation approach.
• Mg, Cu ions may be played as the role of energy transfer centers.
• The emission wavelength can be easily tuned by varying of shell thickness.
• The PL intensity of Mg, Cu-doped CdS/ZnSe increases in comparison to CdS samples.