Cation exchange assisted synthesis of ZnCdSe/ZnSe quantum dots with narrow emission line widths and near-unity photoluminescence quantum yields

2020 ◽  
Vol 56 (45) ◽  
pp. 6130-6133 ◽  
Author(s):  
Xiao Jin ◽  
Kanlin Xie ◽  
Tingting Zhang ◽  
Huada Lian ◽  
Zhenghe Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Emission Line ◽  
Cation Exchange ◽  
Quantum Yields ◽  
Line Widths ◽  
Narrow Emission

ZnCdSe/ZnSe quantum dots reveal a notable FWHM of 17.1 nm with a near-unity PL QY at 631 nm.

Comparison of single-layer and bilayer InAs/GaAs quantum dots with a higher InAs coverage

2010 ◽  
Vol 18 (3) ◽  
Author(s):  
S. Sengupta ◽  
S.Y. Shah ◽  
N. Halder ◽  
S. Chakrabarti
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Emission Line ◽  
Size Distribution ◽  
Single Layer ◽  
Quantum Dot Lasers ◽  
Narrow Linewidth ◽  
Inas Quantum Dots ◽  
Monolayer Coverage ◽  
Narrow Emission

AbstractEpitaxially grown self-assembled InAs quantum dots (QDs) have found applications in optoelectronics. Efforts are being made to obtain efficient quantum-dot lasers operating at longer telecommunication wavelengths, specifically 1.3 μm and 1.55 μm. This requires narrow emission linewidth from the quantum dots at these wavelengths. In InAs/GaAs single layer quantum dot (SQD) structure, higher InAs monolayer coverage for the QDs gives rise to larger dots emitting at longer wavelengths but results in inhomogeneous dot-size distribution. The bilayer quantum dot (BQD) can be used as an alternative to SQDs, which can emit at longer wavelengths (1.229 μm at 8 K) with significantly narrow linewidth (∼16.7 meV). Here, we compare the properties of single layer and bilayer quantum dots grown with higher InAs monolayer coverage. In the BQD structure, only the top QD layer is covered with increased (3.2 ML) InAs monolayer coverage. The emission line width of our BQD sample is found to be insensitive towards post growth treatments.

scholarly journals One pot synthesis of thick shell blue emitting CdZnS/ZnS quantum dots with narrow emission line width

2020 ◽  
Vol 10 (5) ◽  
pp. 1232
Author(s):  
Bing Xu ◽  
Tingting Zhang ◽  
Xinru Lin ◽  
Huimin Yang ◽  
Xiao Jin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Emission Line ◽  
Line Width ◽  
Thick Shell ◽  
One Pot ◽  
One Pot Synthesis ◽  
Narrow Emission

Thick-Shell CuInS2/ZnS Quantum Dots with Suppressed “Blinking” and Narrow Single-Particle Emission Line Widths

Nano Letters ◽  
2017 ◽  
Vol 17 (3) ◽  
pp. 1787-1795 ◽  
Author(s):  
Huidong Zang ◽  
Hongbo Li ◽  
Nikolay S. Makarov ◽  
Kirill A. Velizhanin ◽  
Kaifeng Wu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Emission Line ◽  
Single Particle ◽  
Particle Emission ◽  
Thick Shell ◽  
Line Widths

Enabling Narrow Emission Line Widths in Colloidal Nanocrystals through Coalescence Growth

2020 ◽  
Vol 32 (17) ◽  
pp. 7524-7534
Author(s):  
James Cassidy ◽  
Cole Ellison ◽  
Jacob Bettinger ◽  
Mingrui Yang ◽  
Pavel Moroz ◽  
...  
Keyword(s):  
Emission Line ◽  
Colloidal Nanocrystals ◽  
Line Widths ◽  
Narrow Emission

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>

Facile Synthesis of Colloidal Zn3X2 (X = P, As) Quantum Dots: Transformation into (InyZn1-y)3X2 via Cation-Exchange Reactions

Nanoscale ◽  
2021 ◽  
Author(s):  
Sang-Wook Kim ◽  
Seungmin Baek ◽  
Jin-Soo Ha ◽  
Sungwoo Kim
Keyword(s):  
Quantum Dots ◽  
Cation Exchange ◽  
Environmentally Friendly ◽  
Exchange Reactions ◽  
Facile Synthesis ◽  
Organometallic Precursor

We firstly synthesized uniform Zn3X2 (X=P, As) quantum dots (QDs) using stable, environmentally friendly zinc precursor instead of organometallic precursor such as Me2Zn or Et2Zn, and controlled the QD size...

Optical transformation of a CdTe quantum dot-based paper sensor for a visual fluorescence immunoassay induced by dissolved silver ions

2017 ◽  
Vol 5 (4) ◽  
pp. 826-833 ◽  
Author(s):  
Zhenzhen Lin ◽  
Shuzhen Lv ◽  
Kangyao Zhang ◽  
Dianping Tang
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Cation Exchange ◽  
Carcinoembryonic Antigen ◽  
Silver Ions ◽  
Fluorescence Immunoassay ◽  
Cation Exchange Reaction ◽  
Optical Transformation ◽  
Cdte Quantum Dot ◽  
Paper Sensor

This work designs a visual fluorescence immunoassay for carcinoembryonic antigen based on structural and optical transformation of CdTe quantum dots immobilized on paper by cation-exchange reaction.

Cation Exchange in Zn–Ag–In–Se Core/Alloyed Shell Quantum Dots and Their Applications in Photovoltaics and Water Photolysis

2018 ◽  
Vol 31 (1) ◽  
pp. 161-170 ◽  
Author(s):  
Ganga Halder ◽  
Anima Ghosh ◽  
Sahanaz Parvin ◽  
Sayan Bhattacharyya
Keyword(s):  
Quantum Dots ◽  
Cation Exchange ◽  
Water Photolysis
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