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INTRODUCTION: Cadmium sulfides (CdS) are regarded as a prominent class of
broadband-emitting nanoparticles and contain a direct band gap of 2
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It has
been widely used in light-emitting diodes for flat panel displays and chiefly in photo
chrome–fluorophore assemblage as fluorophores in solar cells [5] CdS Quantum
Dots are the inorganic semiconductors that belong to the cadmium chalcogenide
family
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The Bohr radius of CdS
particles is 5
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CdS nanoparticles or particles with a size smaller than 5
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CdS QDs show 3D
quantum confinement due to their distinct energy levels
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As a result of this quantum confinement, in CdS QDs, the
photoluminescence emission spectrum and the phosphorescence emission
spectrum are produced, which show a sharp and narrow peak, due to the discrete
electronic transitions
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The observation of both photoluminescence and phosphorescence emission spectra
for CdS QDs can provide valuable information about the electronic structure, size,
and properties of the QDs
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The bandgap of bulk CdS is around 2
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Therefore, the absorption peak of bulk CdS is usually
observed in the ultraviolet to the blue region of the electromagnetic spectrum,
around 525-550 nm
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As a result, the absorption peak of CdS QDs is
typically observed in the blue to an ultraviolet region of the electromagnetic
spectrum, around 375-425 nm
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5 eV, which means that they absorb light in the
ultraviolet region of the electromagnetic spectrum
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4 eV, which means that they
absorb light in the blue-green region of the electromagnetic spectrum
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1
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2
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CdS QDs can be synthesized in different crystalline structures, including the facecentered cubic (FCC), hexagonal close-packed (HCP), and wurtzite structures
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Among these wet chemicals, the method is the most
commonly used technique
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They are inexpensive, take less time, and are less hazardous as

compared to other techniques
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CdS QDs have a wide range of potential applications due to their
unique optical and electronic properties
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They have potential applications in imaging,
diagnostics, and therapeutics
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CdS QDs have
potential applications in optoelectronic devices, such as light-emitting diodes (LEDs),
due to their ability to emit light and their high quantum efficiency
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48 10-3 M-1
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References
1
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(2018)
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at

Various

2
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V
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A
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S
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V
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Y
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A
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Sizes and fluorescence of cadmium sulfide quantum
dots
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Lee, H
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, Issam, A
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, Belmahi, M
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B
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, & Alnot, M
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Synthesis and characterizations of bare CdS nanocrystals using
chemical precipitation method for photoluminescence application
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4
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, Liu, E
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Y
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, Skabara, P
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, Cummins, S
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, Ryley, S
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(2005)
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 Journal of Materials Chemistry, 15(12), 1238-1243
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Javed, H
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, Akhter, Z
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A
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, & Iqbal, A
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Fluorescence modulation of cadmium sulfide quantum dots by azobenzene
photochromic switches
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6
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, Amarelle, V
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, Quezada, C
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, EspinozaGonzález, R
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& Pérez-Donoso, J
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(2021)
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UYP1 and their application as a photosensitizer in solar cells
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7
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, Ma, C
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, Zuverza-Mena, N
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, Huang, Y
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C
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Surface coating determines the response of soybean

plants to cadmium sulfide quantum dots
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8
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A
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, Fen, Y
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, Abdullah, J
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A
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, Ramdzan, N
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M
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A
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Optical and structural properties of cadmium sulfide
quantum dots based thin films as a potential sensing material for dengue
virus E-protein
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9
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, Erdamar, A
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, Sennaroglu, A
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, & Acar, H
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(2007)
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 The Journal of Physical Chemistry B, 111(44), 1266812675
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Dalei, K
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 Synthesis and characterization of cadmium sulfide
nanoparticles and their utilization in the removal of cadmium from aqueous
solution (Doctoral dissertation)

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