Photoluminescence in the 2–5 mm spectral region is reported from InAs12xSbx quantum dots grown from the liquid phase at 580 °C on an InAs ~100! substrate. Atomic force microscopy shows that coalesced quantum dots and then isolated quantum dots are formed with increasing Sb composition (x50.2– 0.3) and strain. The 4 K photoluminescence of the isolated and coalesced quantum dots was observed to p...

up an entire field of interdisciplinary research! Although foundational research into nano-scaled semiconductors was already underway by 1973 when Leo Esaki won the Nobel Prize in Physics for his work on semiconductor quantum devices, quantum dots were not recognized for their biological applications until the pioneering papers of the Alivisatos lab and the Nie lab in 1998 [1]. In these papers,...

Vertically aligned single crystalline ZnO nanorod arrays, approximately 3 μm in length and 50-450 nm in diameter are grown by a simple solution approach on a Zn foil substrate. CdS and CdSe colloidal quantum dots are assembled onto ZnO nanorods array using water-soluble nanocrystals capped as-synthesized with a short-chain bifuncional linker thioglycolic acid. The solar cells co-sensitized with...

Quantum walks have been employed widely to develop new tools for quantum information processing recently. A natural quantum walk dynamics of interacting particles can be used to implement efficiently the universal quantum computation. In this work quantum walks of electrons on a graph are studied. The graph is composed of semiconductor quantum dots arranged in a circle. Electrons can tunnel bet...

We present the first photoelectron spectroscopy measurements of quantum dots (semiconductor nanocrystals) in the gas phase. By coupling a nanoparticle aerosol source to a femtosecond velocity map imaging photoelectron spectrometer, we apply robust gas-phase photoelectron spectroscopy techniques to colloidal quantum dots, which typically must be studied in a liquid solvent or while bound to a su...

We report a high-performance phosphors-free white light-emitting-diodes (w-LEDs) using Ba2V2O7 or Sr2V2O7 quantum dots that directly heteroepitaxially grown on common quartz substrates by polymer assisted deposition (PAD). The quantum efficiency of quantum dots is as high as 95%. More importantly, electronic local functions, band structure and partial density of states have been firstly calcula...

In the latest years, a great effort has been dedicated to the fabrication and experimental analysis of coupled quantum dots arrays[1,2]. From the applications point of view, this nanosystems have a great potential to be used in quantum dot lasers and memory devices. The simplest system to study is a single pair of coupled quantum dots forming a molecule. It is clear that this system is of funda...

We report integrated charge sensing measurements on a Si/SiGe double quantum dot. The quantum dot is shown to be tunable from a single, large dot to a well-isolated double dot. Charge sensing measurements enable the extraction of the tunnel coupling t between the quantum dots as a function of the voltage on the top gates defining the device. Control of the voltage on a single such gate tunes th...

A theoretical study of the effects of applied magnetic fields and hydrostatic pressure on the electron-hole transition energies in selfassembled InAs/GaAs quantum dots is presented. The effective-mass approximation and a model of a cylindrical-shaped quantum dot with in-plane parabolic potential have been used to describe the InAs/GaAs quantum dots. Present theoretical results are in quite good...

We analyze how to realize Rec. 2020 wide color gamut with quantum dots. For photoluminescence, our simulation indicates that we are able to achieve over 97% of the Rec. 2020 standard with quantum dots by optimizing the emission spectra and redesigning the color filters. For electroluminescence, by optimizing the emission spectra of quantum dots is adequate to render over 97% of the Rec. 2020 st...