Abstract
In this work, the Cd0.9-xZn0.1BixS QDs with different compositions of Bi3+ ions (0 ≤ x ≤ 0.05) were synthesized using a facile chemical route. The prepared QDs were characterized for analyzing the structural, morphological, elemental, optical, band gap, photoluminescence and electrochemical properties. XRD results confirmed that the Cd0.9-xZn0.1BixS QDs have a cubic structure. The mean crystallite size was increased from ~ 2 to ~ 5 nm for the increase of Bi3+ ions concentration. The optical transmittance behavior was decreased with increasing Bi3+ ions. The scanning electron microscope images showed that the prepared QDs possessed agglomerated morphology and the EDAX confirmed the presence of doped elements as per stoichiometry ratio. The optical band gap was slightly blue-shifted for initial substitution (Bi3+ = 1%) of Bi3+ ions and red-shifted for further increase of Bi3+ compositions. The optical band gap was ranged between 3.76 and 4.0 eV. High intense red emission was received for Bi3+ (1%) doped Zn:CdS QDs. The red emission peaks were shifted to a higher wavelength side due to the addition of Bi3+ ions. The PL emission on UV-region was raised for Bi3+ (1%) and it was diminished. Further, a violet (422 nm) and blue (460 nm) emission were received for Bi3+ ions doping. The cyclic voltammetry analysis showed that Bi3+ (0%) possessed better electrical properties than other compositions of Bi3+ ions.
Highlights
The Quantum dots (QDs) consist of semiconductor nanoparticles which dimension varies from 1 to 10 nm [1,2,3]
The fluorescence emission wavelength from deep red (DR) to near-infrared (NIR) region is highly required for bio-imaging sensor designing and other bio-medical applications
The QDs of C d0.9Zn0.1S doped with the various compositions of Bi3+ ions have been synthesized by the facile chemical route
Summary
The Quantum dots (QDs) consist of semiconductor nanoparticles which dimension varies from 1 to 10 nm [1,2,3]. QDs are more photo-stable, higher signal-to-noise ratio, sharp and narrow emission spectra, longer fluorescence and higher photo-resistance compare to conventional organic dyes. These unique properties of QDs are attracted much attention in the field of biomedical imaging and optoelectronic devices like sensors, photoconductive cells, photovoltaic cells and solar cells, etc. Cd-Zn–S QDs need some advantage since fast recombination of charge carriers These materials are having good efficiency for photolysis depends on the integration with appropriate dopants like Ni, Bi, Ba, Sb, Mn, Co, Fe, etc.
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