In monolayer MoS2, optical transitions across the direct band gap are governed by chiral selection rules, allowing optical valley initialization. In time-resolved photoluminescence (PL) experiments, we find that both the polarization and emission dynamics do not change from 4 to 300 K within our time resolution. We measure a high polarization and show that under pulsed excitation the emission p...

GaAs/Al0.1Ga0.9As core-shell nanowires (CSNWs), with average lateral size of 125 nm, were grown on gold nanoparticle-activated Si (100) and Si (111) substrates via molecular beam epitaxy. Room temperature-photoluminescence (RT-PL) from the samples showed bulk-like GaAs and Al0.1Ga0.9As bandgap emission peaks at 1.43 and 1.56 eV, respectively. Higher PL emission intensity of the sample on Si (11...

The improved efficiency of perovskite-related photovoltaic devices, such as light-emitting diodes (LEDs), is related to film uniformity, the compactness each layer, and thickness. Herein, we traditional single-solvent, solution-processed method developed a co-solvent prepare two-dimensional (2D) (C4H9NH3)2PbBr4 perovskite for blue photoluminescence (PL) emissions. A poor film-forming uniformity...

Electrophysiological studies in Drosophila melanogaster and Periplaneta americana have found that the receptor current in their microvillar photoreceptors is generated by two light-activated cationic channels, TRP (transient receptor potential) and TRPL (TRP-like), each having distinct properties. However, the relative contribution of the two channel types to sensory information coding by photo...

Background: Umbilical cord blood hematopoietic stem cells (UCB-HSCs) are an attractive source for transplantation. The generation of megakaryocyte-committed cells could lead to shorten period of thrombocytopenia after HSCs transplantation. Platelet lysate (PL) unlike fetal bovine serum (FBS) can prevent immune problems as well as avert transmission of certain diseases to the recipient. In this ...

background : near infrared spectroscopy imaging is one of the new techniques used for investigating structural and functionality of different body tissues. this is done by injecting light into the medium and measuring the photon intensity at the surface of the tissue. method : in this paper the different medical applications, various imaging and simulation techniques of nirs imaging is describe...

A g-C3N4/CdSe quantum dot/[Fe2S2(CO)6] composite has been successfully constructed. The structure and chemical composition of the were investigated via, inter alia, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron (XPS). ability assembly to act as a photocatalyst for proton reduction form hydrogen gas was studied. With visible light irr...

This paper summarizes some of the recent advances made by our group on the growth, characterization and applications of A1GaN alloys with high Al contents. Recently, our group has achieved highly conductive n-type AlxGal-xN for x as high as 0.7 (a resistivity value as low as 0.15 ohm-cm has been achieved). Prior to this, only insulating AlxGal-xN (x > 0.5) can be obtained. Our success is largel...

Impacts of structural and point defects on the carrier (exciton) recombination dynamics in wide bandgap semiconductors such as AlN, high AlN mole fraction AlxGa1-xN alloys, and GaN were studied in this project. For this purpose, we quantified the radiative lifetimes (R) and nonradiative lifetimes (NR) for the near-band-edge (NBE) emission by measuring the luminescence lifetimes () and equiva...