scholarly journals Effect of InAs quantum dots capped with GaAs on atomic-scale ordering in Ga0.5In0.5P

2019 ◽  
Vol 125 (5) ◽  
pp. 053104
Author(s):  
P.-Y. Su ◽  
H. Liu ◽  
R. M. S. Kawabata ◽  
E. C. Weiner ◽  
R. Jakomin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Atomic Scale ◽  
Inas Quantum Dots

scholarly journals Atomic scale study of the impact of the strain and composition of the capping layer on the formation of InAs quantum dots

2007 ◽  
Vol 101 (8) ◽  
pp. 081707 ◽  
Author(s):  
J. M. Ulloa ◽  
C. Çelebi ◽  
P. M. Koenraad ◽  
A. Simon ◽  
E. Gapihan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Atomic Scale ◽  
Inas Quantum Dots ◽  
Capping Layer ◽  
The Impact

scholarly journals Atomic-scale structure and photoluminescence of InAs quantum dots in GaAs and AlAs

2005 ◽  
Vol 72 (16) ◽  
Author(s):  
P. Offermans ◽  
P. M. Koenraad ◽  
J. H. Wolter ◽  
K. Pierz ◽  
M. Roy ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Scale Structure ◽  
Atomic Scale ◽  
Inas Quantum Dots ◽  
Atomic Scale Structure

scholarly journals Impact of N on the atomic-scale Sb distribution in quaternary GaAsSbN-capped InAs quantum dots

2012 ◽  
Vol 7 (1) ◽  
Author(s):  
Daniel F Reyes ◽  
David González ◽  
Jose M Ulloa ◽  
David L Sales ◽  
Lara Dominguez ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Atomic Scale ◽  
Inas Quantum Dots

Magnetotunneling spectroscopy imaging of electron wave functions in self-assembled InAs quantum dots

2001 ◽  
Vol 171 (12) ◽  
pp. 1365
Author(s):  
E.E. Vdovin ◽  
Yu.N. Khanin ◽  
Yu.V. Dubrovskii ◽  
A. Veretennikov ◽  
A. Levin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Wave Functions ◽  
Electron Wave ◽  
Inas Quantum Dots ◽  
Self Assembled

Electrically Driven Near-Infrared Broadband Light Source with Gaussian-Like Spectral Shape Based on Multiple InAs Quantum Dots

2016 ◽  
Vol E99.C (3) ◽  
pp. 381-384 ◽  
Author(s):  
Takuma YASUDA ◽  
Nobuhiko OZAKI ◽  
Hiroshi SHIBATA ◽  
Shunsuke OHKOUCHI ◽  
Naoki IKEDA ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Light Source ◽  
Near Infrared ◽  
Spectral Shape ◽  
Inas Quantum Dots ◽  
Broadband Light Source

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>

Carbon Nanotubes, Quantum Dots and Dendrimers as Potential Nanodevices for Nanotechnology Drug Delivery Systems

2013 ◽  
Vol 6 (3) ◽  
pp. 2113-2124
Author(s):  
Prashant Malik ◽  
Neha Gulati ◽  
Raj Kaur Malik ◽  
Upendra Nagaich
Keyword(s):  
Carbon Nanotubes ◽  
Drug Delivery ◽  
Quantum Dots ◽  
Self Assembly ◽  
Drug Delivery Systems ◽  
Delivery Systems ◽  
Atomic Scale ◽  
Sustained Drug Delivery ◽  
Pharmaceutical Nanotechnology ◽  
Conventional Device

Nanotechnology deal with the particle size in nanometers. Nanotechnology is ranging from extensions of conventional device physics to completely new approaches based upon molecular self assembly, from developing new materials with dimensions on the nanoscale to direct control of matter on the atomic scale. In nanotechnology mainly three types of nanodevices are described: carbon nanotubes, quantum dots and dendrimers. It is a recent technique used as small size particles to treat many diseases like cancer, gene therapy and used as diagnostics. Nanotechnology used to formulate targeted, controlled and sustained drug delivery systems. Pharmaceutical nanotechnology embraces applications of nanoscience to pharmacy as nanomaterials and as devices like drug delivery, diagnostic, imaging and biosensor materials. Pharmaceutical nanotechnology has provided more fine tuned diagnosis and focused treatment of disease at a molecular level.    

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