Synthesis, characterization and optical properties of cobalt and lanthanide doped CdS nanoparticles

Abstract

Cadmium sulphide (CdS) nanoparticles doped with Co 2? and co-doped with Co 2? and rare earth metallic ions have been prepared by co-precipitation method. The synthesized nanoparticles have been characterized by X-ray powder diffraction studies, energy dispersive X-ray analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-visible spectroscopy, particle size by dynamic light scattering and photoluminescence studies. The X-ray diffraction results indicate that CdS nanoparticles can be co-doped with cobalt and rare earth metallic ions without altering XRD pattern. The particle size calculated from XRD results is in range of 40-50 nm. SEM results show that the synthesized particles are spherical in shape and TEM results reveal that synthesized particles have a very small size nearing to Bohr radius for bulk CdS. Absorption spectra of all the samples show strong blue shift from bulk CdS. Interesting luminescence characteristics have been observed for co-doped CdS nanoparticles at room temperature. The relative fluorescence intensity of co-doped samples is significantly higher than that of undoped and Co 2? doped CdS nanoparticles.

Influence of Mg Doping on ZnO Nanoparticles for Enhanced Photocatalytic Evaluation and Antibacterial Analysis

“…5b, it is found that the band gap energy ( E g ) for pure ZnO NPs is around 3.36 eV and decreases with Mg dopant (3.36 to 3.04 eV). The band gap is decreased due to strong quantum confinements and enhancement in their surface area to volume ratio [49]. Enhancement of redshift and decrease in band gap energy ( E g ) confirm the presence of Mg 2+ inside the Zn 2+ site of the ZnO lattice.…”

Structural phase transition and photoluminescence properties of wurtzite CdS:Eu3+ nanoparticles under high pressure

“…Recently, a variety of lanthanide ions, including Nd 3+ , Sm 3+ , Eu 3+ , Tb 3+ , Gd 3+ , Er 3+ , and Yb 3+ , have been successfully doped into CdS QDs. [15][16][17][18][19][20] Compared to the transition-metal ions, lanthanide ions are advantageous dopants because of their sharper emission signals with a unique spectroscopic signature for unambiguous spectral identication. Therein, the Eu 3+ doping was demonstrated to be an effective way to enhance the performance of QDs in the photocatalysis and biomedical applications (immunoassay, detection of metal ions and imaging applications) as the edge over QDs, long uorescence lifetime, sharp emission peaks with narrow band width, and lack of blinking and biocompatibility.…”

Morphological, Photoluminescence, and Electrical Measurements of Rare-Earth Metal-Doped Cadmium Sulfide Thin Films

“…When combined with doping, this enhanced mobility facilitates the diffusion of dopant atoms into the CdS lattice. This, in turn, can promote grain boundary migration and Ostwald ripening, wherein smaller grains dissolve and contribute to the growth of larger grains, leading to an increase in average grain size …”

“…This, in turn, can promote grain boundary migration and Ostwald ripening, wherein smaller grains dissolve and contribute to the growth of larger grains, leading to an increase in average grain size. 50 3.2. FTIR Spectroscopy Analysis.…”