Step-Wise Synthesis of InP/ZnS Core−Shell Quantum Dots and the Role of Zinc Acetate

2009 ◽  
Vol 21 (4) ◽  
pp. 573-575 ◽  
Author(s):  
Euidock Ryu ◽  
Sungwoo Kim ◽  
Eunjoo Jang ◽  
Shinae Jun ◽  
Hyosook Jang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Zinc Acetate ◽  
Core Shell

scholarly journals Effect of dopant concentration and the role of ZnS shell on optical properties of Sm3+ doped CdS quantum dots

RSC Advances ◽  
2021 ◽  
Vol 11 (14) ◽  
pp. 7961-7971
Author(s):  
N. D. Vinh ◽  
P. M. Tan ◽  
P. V. Do ◽  
S. Bharti ◽  
V. X. Hoa ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Dopant Concentration ◽  
Core Shell ◽  
Cds Quantum Dots ◽  
Cds Qds

The role of samarium (Sm) dopant on the structural, morphological, and optical properties of CdS QDs and CdS/ZnS core/shell QDs was methodically reported.

Highly stable CuInS2@ZnS:Al core@shell quantum dots: the role of aluminium self-passivation

2015 ◽  
Vol 51 (42) ◽  
pp. 8757-8760 ◽  
Author(s):  
Pinhua Rao ◽  
Wei Yao ◽  
Zhichun Li ◽  
Long Kong ◽  
Wenqi Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Core Shell

A schematic illustration for enhancing the photostability of CuInS2@ZnS QDs by doping aluminium.

scholarly journals Stability of core/shell quantum dots—role of pH and small organic ligands

2013 ◽  
Vol 20 (7) ◽  
pp. 4872-4880 ◽  
Author(s):  
Rute F. Domingos ◽  
Cristiana Franco ◽  
José P. Pinheiro
Keyword(s):  
Quantum Dots ◽  
Organic Ligands ◽  
Core Shell

The role of surface chemistry in determining in vivo biodistribution and toxicity of CdSe/ZnS core–shell quantum dots

Biomaterials ◽  
2013 ◽  
Vol 34 (34) ◽  
pp. 8741-8755 ◽  
Author(s):  
Yuan Tang ◽  
Songling Han ◽  
Hongmei Liu ◽  
Xin Chen ◽  
Li Huang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Chemistry ◽  
Core Shell ◽  
In Vivo Biodistribution

scholarly journals Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1366
Author(s):  
Rashid A. Ganeev ◽  
Andrey I. Zvyagin ◽  
Ivan A. Shuklov ◽  
Maksim G. Spirin ◽  
Oleg V. Ovchinnikov ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nonlinear Refraction ◽  
Colloidal Quantum Dots ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Core Shell ◽  
Nonlinear Scattering ◽  
532 Nm

InP@ZnS core-shell colloidal quantum dots (CQDs) were synthesized and characterized using the z-scan technique. The nonlinear refraction and nonlinear absorption coefficients (γ = −2 × 10−12 cm2 W−1, β = 4 × 10−8 cm W−1) of these CQDs were determined using 10 ns, 532 nm pulses. The saturable absorption (β = −1.4 × 10−9 cm W−1, Isat = 3.7 × 108 W cm−2) in the 3.5 nm CQDs dominated at small intensities of the probe pulses (I ≤ 7 × 107 W cm−2) followed by reverse saturable absorption at higher laser intensities. We report the optical limiting studies using these CQDs showing the suppression of propagated nanosecond radiation in the intensity range of 8 × 107–2 × 109 W cm−2. The role of nonlinear scattering is considered using off-axis z-scan scheme, which demonstrated the insignificant role of this process along the whole range of used intensities of 532 nm pulses. We discuss the thermal nature of the negative nonlinear refraction in the studied species.

Role of Core–Shell Interfaces on Exciton Recombination in CdSe–CdxZn1–xS Quantum Dots

2014 ◽  
Vol 118 (41) ◽  
pp. 24117-24126 ◽  
Author(s):  
Alessandro Minotto ◽  
Francesco Todescato ◽  
Ilaria Fortunati ◽  
Raffaella Signorini ◽  
Jacek J. Jasieniak ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Core Shell ◽  
Exciton Recombination

High-Temperature Synthesis of CdSe-Based Core/Shell, Core/Shell/Shell, and Core/Graded-Shell Nanoplatelets for Stable and Efficient Narrowband Emitters

2019 ◽  
Author(s):  
Aurelio A. Rossinelli ◽  
Henar Rojo ◽  
Aniket S. Mule ◽  
Marianne Aellen ◽  
Ario Cocina ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Temperature ◽  
Equilibrium Shape ◽  
Size Variation ◽  
Crystal Defects ◽  
Atomic Scale ◽  
Quantum Yields ◽  
Core Shell ◽  
Compositional Gradient ◽  
High Quality

<div>Colloidal semiconductor nanoplatelets exhibit exceptionally narrow photoluminescence spectra. This occurs because samples can be synthesized in which all nanoplatelets share the same atomic-scale thickness. As this dimension sets the emission wavelength, inhomogeneous linewidth broadening due to size variation, which is always present in samples of quasi-spherical nanocrystals (quantum dots), is essentially eliminated. Nanoplatelets thus offer improved, spectrally pure emitters for various applications. Unfortunately, due to their non-equilibrium shape, nanoplatelets also suffer from low photo-, chemical, and thermal stability, which limits their use. Moreover, their poor stability hampers the development of efficient synthesis protocols for adding high-quality protective inorganic shells, which are well known to improve the performance of quantum dots. <br></div><div>Herein, we report a general synthesis approach to highly emissive and stable core/shell nanoplatelets with various shell compositions, including CdSe/ZnS, CdSe/CdS/ZnS, CdSe/Cd<sub>x</sub>Zn<sub>1–x</sub>S, and CdSe/ZnSe. Motivated by previous work on quantum dots, we find that slow, high-temperature growth of shells containing a compositional gradient reduces strain-induced crystal defects and minimizes the emission linewidth while maintaining good surface passivation and nanocrystal uniformity. Indeed, our best core/shell nanoplatelets (CdSe/Cd<sub>x</sub>Zn<sub>1–x</sub>S) show photoluminescence quantum yields of 90% with linewidths as low as 56 meV (19.5 nm at 655 nm). To confirm the high quality of our different core/shell nanoplatelets for a specific application, we demonstrate their use as gain media in low-threshold ring lasers. More generally, the ability of our synthesis protocol to engineer high-quality shells can help further improve nanoplatelets for optoelectronic devices.</div>

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