Theoretical investigation on dependence of luminescence properties from CdS/ZnS core-shell quantum dots on core size and quantum confinement

2021 ◽  
Author(s):  
Sanjib Kabi ◽  
Saikat Chattopadhyay ◽  
Sanat Kumar Das
Keyword(s):  
Quantum Dots ◽  
Theoretical Investigation ◽  
Quantum Confinement ◽  
Luminescence Properties ◽  
Core Shell ◽  
Core Size

Effect of core size on the luminescence properties of cadmium telluride/zinc sulphide core-shell quantum dots

2020 ◽  
Vol 33 ◽  
pp. 2358-2361
Author(s):  
Sumathi Subramanian ◽  
Sasikala Ganapathy ◽  
Maheswari Rajaram ◽  
Suguna Subramanian ◽  
Arivarasan Ayyaswamy ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cadmium Telluride ◽  
Zinc Sulphide ◽  
Luminescence Properties ◽  
Core Shell ◽  
Core Size

scholarly journals Quantum Confinement Effect and Photoenhancement of Photoluminescence of PbS and PbS/MnS Quantum Dots

2020 ◽  
Vol 10 (18) ◽  
pp. 6282
Author(s):  
Muhammad Safwan Zaini ◽  
Josephine Ying Chyi Liew ◽  
Shahrul Ainliah Alang Ahmad ◽  
Abdul Rahman Mohmad ◽  
Mazliana Ahmad Kamarudin
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Quantum Confinement ◽  
Shell Thickness ◽  
Quantum Confinement Effect ◽  
Band Gap Energy ◽  
Confinement Effect ◽  
Core Shell ◽  
Lead Sulphide ◽  
Peak Energy

The quantum confinement effect and photoenhancement of photoluminescence (PL) of lead sulphide (PbS) quantum dots (QDs) and lead sulphide/manganese sulphide (PbS/MnS) core shell QDs capped with thiol ligands in aqueous solution were investigated. From PL results, the presence of MnS shells gives a strong confinement effect which translates to higher emission energy in PbS/MnS core shell QDs. Increasing MnS shell thickness from 0.3 to 1.5 monolayers (ML) causes a blueshift of PL peak energies as the charge carriers concentrated in the PbS core region. Enhancement of the PL intensity of colloidal PbS and PbS/MnS core shell QDs has been observed when the samples are illuminated above the band gap energy, under continuous irradiation for 40 min. Luminescence from PbS QDs and PbS/MnS core shell QDs can be strongly influenced by the interaction of water molecules and oxygen present in aqueous solution adsorbed on the QD surface. However, PbS/MnS core shell QDs with a shell thickness of 1.5 ML did not show a PL peak energy stability as it was redshifted after 25 min, probably due to wider size distribution of the QDs.

Light-responsive hybrid material based on luminescent core–shell quantum dots and steroidal organogel

2016 ◽  
Vol 4 (29) ◽  
pp. 7035-7042 ◽  
Author(s):  
L. C. Schmidt ◽  
V. C. Edelsztein ◽  
C. C. Spagnuolo ◽  
P. H. Di Chenna ◽  
R. E. Galian
Keyword(s):  
Quantum Dots ◽  
Hybrid Material ◽  
Luminescence Properties ◽  
Core Shell ◽  
Intrinsic Properties

An integrated multifunctional QD–organogel hybrid with reversible photoswitchable luminescence properties is reported, combining the intrinsic properties of CdSe/ZnS core–shell QDs, a non-cholesteryl steroid organogel and a photochromic diarylethene.

Visible-light driven photocatalytic hydrogen generation by water-soluble all-inorganic core–shell silicon quantum dots

2020 ◽  
Vol 8 (31) ◽  
pp. 15789-15794
Author(s):  
Hiroshi Sugimoto ◽  
Hao Zhou ◽  
Miho Takada ◽  
Junichiro Fushimi ◽  
Minoru Fujii
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Quantum Confinement ◽  
Hydrogen Generation ◽  
Water Soluble ◽  
Core Shell ◽  
Photocatalytic Hydrogen Generation ◽  
Quantum Size ◽  
Visible Light Driven ◽  
Si Quantum Dots

Photocatalytic H2 generation by B,P-codoped Si quantum dots (QDs) with diameters in the quantum confinement regime is investigated. The H2 generation rate is enhanced by the increase of reduction ability of Si QDs owing to the quantum size effect.

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