Selective spectral detection of ultraviolet (UV) radiation is highly important across numerous fields from health and safety to industrial environmental monitoring applications. Herein, a nontoxic, visible-blind, quantum dot (QD)-based sensing scheme that expands the coverage silicon complementary metal-oxide-semiconductor (CMOS) sensors into UV, enabling efficient UV without affecting sensor performance in visible UV-band discrimination, reported. This uses zinc magnesium oxide (ZnMgO) QDs...

Core/shell nanocrystal quantum dots (NQDs) have shown great potential as efficient electroluminescent materials in devices like down-conversion phosphors and light-emitting diodes (LEDs). The efficiency of these is nonlinearly enhanced by the use high yield (QY) materials. Though relatively QY with inherent advantages for device applications are achieved thick-shell CdSe/CdS NQDs, their not anywhere near unity due to lack correlation microstructure photophysical properties. Here, this...

Solution-processed colloidal III-V semiconductor-based quantum dots (QDs) represent promising and environmentally-friendly alternatives to Cd-based QDs in the realms of optoelectronics biological applications. While InP-based core-shell have demonstrated efficient light-emitting diode (LED) performance visible region, achieving deep-red emission (above 700 nm) with a narrow linewidth has proven challenging. Herein, study presents novel strategy for synthesizing InP/ZnSe/ZnS core-shell-shell...

Colloidal anisotropic Cu–Zn–In–Se-based nanocrystals synthesized in a one-pot seed-mediated approach exhibit an intensive narrow photoluminescence with maxima ranging from 1080 nm to 1220 and quantum yields reaching 40%.

Effective manipulation of magnetic spin within a semiconductor leading to search for ferromagnets with semiconducting properties has evolved into an important field dilute semiconductors (DMS). Although lot research is focused on understanding the still controversial origin magnetism, efforts are also underway develop new materials higher temperatures spintronics applications. However, so far, toward quantum-dots(QDs)-based DMS plagued problems phase separation, nonuniform distribution...

Abstract Colloidal semiconductor quantum dots (QDs) can be considered a promising material platform for solution‐processed laser diodes. However, due to some fundamental challenges, the realization of electrically pumped lasing based on QDs remains unresolved. Here, binary blend and ZnO nanocrystals is employed, which serve as nano‐sized scatterers facilitate waveguide gain in ultra‐thin films. By carefully engineering electric field these films, an infrared amplified spontaneous emission...

Solution-processed quantum dot (QD) based blue emitters are of paramount importance in the field optoelectronics. Despite large research efforts, examples efficient deep blue/near UV-emitting QDs remain rare due to lack luminescent wide band gap materials and high defect densities existing ones. Here, we introduce a novel type on heavy metal free gallium sulfide (Ga2 S3 ) their core/shell heterostructures Ga2 /ZnS as well /ZnS/Al2 O3 . The photoluminescence (PL) properties core exhibit...

The demonstration of the quantum confinement effect in colloidal dots (QDs) has been extensively studied and exploited mainly Pb Cd chalcogenide systems. There an urgent need recently for development non(less)-toxic QDs to warrant compliance with current safety regulations (Restriction Hazardous Substances (RoHS) Directive 2002/95/EC). Herein, we report Pb/Cd-free, solution processed luminescent Ag2ZnSnS4 (AZTS) QDs. We present a selective controlled amine thiol-free synthesis air stable...

Semiconducting materials uniformly doped with optical or magnetic impurities have been useful in a number of potential applications. However, clustering phase separation during synthesis has made this job challenging. Recently the "inside out" diffusion doping was proposed to be successful obtaining large sized quantum dots (QDs) dilute percentage dopant atoms. Herein, we demonstrate use basic physical chemistry control size and concentration dopants within QDs for given transition metal...

Passivation and optimization of luminescent AZTS QDs with ZnS shells gave rise to a ∼30-fold increase in the PLQY results RoHS compliant low-cost, bright tunable NIR-luminescent phosphors for bio-imaging LED applications.

Engineering interfaces specifically in quantum dot (QD) heterostructures provide several prospects for developing multifunctional building block materials. Precise control over internal structure by chemical synthesis offers a combination of different properties QDs and allows us to study their fundamental properties, depending on structure. Herein, we studied the interface magnetic/nonmagnetic Fe3O4/CdS QD heterostructures. In this work, demonstrate decrease size magnetic core due annealing...

High-quality epitaxial Ge layers for GaAs/Ge/GaAs heterostructures were grown in situ an arsenic-free environment on (100) off-oriented GaAs substrates using two separate molecular beam epitaxy (MBE) chambers, connected via vacuum transfer chamber. The structural, morphological, and band offset properties of these are investigated. Reflection high energy electron diffraction studies exhibited (2 × 2) surface reconstruction after the growth at 450 °C also revealed a smooth Ge. High-resolution...

Research in miniaturization of devices is driven by the presence new challenges small-sized particles. Magnetic interactions at heterostructure interface, specifically interface-driven properties such as exchange bias (EB) core–shell magnetic quantum dots (QDs), have become one primary fields interest nanomagnetism research. The major deterrent QDs superparamagnetic limit, responsible for low or insignificant anisotropy these materials. Formation a sharp interface junction antiferromagnetic...

The synthesis and shape transformation of bimetallic nanocrystals; the role ligands in digestion microsheets towards formation spherical nanocrystals.

Molecular complex formation of dicyclohexano-24-crown-8 with electron acceptors such as [60]- and [70]fullerenes, menadione (vitamin K3), o- p-chloranils have been studied in CCl4 medium. Charge trasfer (CT) absorption bands obtained four cases which correlate well the affinities acceptors. In case [70]fullerene complex, an isosbestic point has obtained. Entropies enthalpies complexes crown ether determined by estimating constants spectrophotometrically at five different temperatures. It is...

Internal structure study at an atomic level is a challenging task with far reaching consequences to its material properties, specifically in the field of transition metal doping quantum dots. Diffusion ions and out dots forming magnetic clusters has been major bottleneck this class materials. from core into nonmagnetic shell core/shell heterostructure architecture attain uniform recently introduced yet be understood. In work, we have studied local variation Fe as function CdS matrix...

The internal structure can be used to tune the properties of quantum dots.

The resorcin[4]arene host compound 2,8,14,20-tetrapentadecylpentacyclo [19.3.1.1.3,71.9,13115,19]octacosa-1(25),3,5,7(28),9,11,13(27),15,17,19(26),21,23-dodecaene-4,6,10,12,16,18,22,24-octol (1) has been shown to form charge-transfer complexes with a series of electron acceptors including [60]- and [70]fullerenes, from the trends in CT transition energies vertical ionization potential 1 estimated (7.62 eV). By UV−vis spectrophotometric method it that forms an inclusion complex...

By UV−vis absorption and fluorescence spectroscopy it has been established that 25,27-dihydroxy-26,28-dimethoxycalix[4]arene (1) forms reverse micelles in CCl4 n-hexane media. The new feature of this compound as a surfactant is even before micelle formation can incorporate water molecules the critical micellization concentration (cmc) nonaqueous media increases with increase ω (=water:1 mole ratio). inclusion complex 1 [70]fullerene CT band that, conjunction those some quinone complexes 1,...

[60]fullerene is known to aggregate in water and all experimental theoretical evidences support that the aggregates contain (C60)13 units. No chemical kinetic study of effect solvent polarity on aggregation C60 has so far been reported. Here we show by simple process scanning electron microscopy (SEM) when methanol added a solution CCl4, spontaneous starts immediately numbers (n) found be dependent CCl4:CH3OH ratio (v/v) medium. One particular two liquids gives uniformly sized clusters for...

Investigation of the magnetism dilute magnetic semiconductors (DMSs) by changing particle dimensionality and doping concentration its complete understanding is a major step toward their application in multifunctional devices. The importance effects, such as magnetization reversal with size invariance respect to for an appropriate functioning DMS systems, empirically well-known. However, explicit demonstration these specifically nanomaterials, has so far not been studied mainly due lack...

Dual doping is a powerful way to tailor the properties of semiconductor quantum dots (QDs) arising out host-dopant and dopant-dopant interactions. Nevertheless, it has seldom been explored due variety thermodynamic challenges, such as differential bonding strength diffusion constant within host matrix that integrates with in dissimilar ways. This work discusses challenges involved administering them constraints one under similar conditions temperature, time, chemical parameters solubility...