A quantum dot including a core and a shell disposed on the core wherein one of the core and the shell includes a first semiconductor nanocrystal including zinc and sulfur and the other of the core and the shell includes a second semiconductor nanocrystal having a different composition from the first semiconductor nanocrystal, the first semiconductor nanocrystal further includes a metal and a halogen configured to act as a Lewis acid in a halide form, an amount of the metal is greater than or equal to about 10 mole percent (mol %) based on a total number of moles of sulfur, and an amount of the halogen is greater than or equal to about 10 mol % based on a total number of moles of sulfur, a method of producing the same, and a composite and an electronic device including the same.

An electroluminescent device including an anode and a cathode facing each other, an emission layer disposed between the anode and the cathode, the emission layer including quantum dots, a hole auxiliary layer disposed between the emission layer and the anode and an electron auxiliary layer disposed between the emission layer and the cathode, wherein the electroluminescent device is configured such that electrons are dominant in the emission layer and a logarithmic value (log (HT/ET)) of a hole transport capability (HT) relative to an electron transport capability (ET) is less than or equal to about 1, or the electroluminescent device is configured such that holes are dominant in the emission layer and the logarithmic log value (log (HT/ET)) of the hole transport capability (HT) relative to the electron transport capability (ET) is greater than or equal to about 0.5.

The present invention relates to a method for synthesizing a semiconducting nanosized material.

Provided is an organic electroluminescent display device that further suppresses reflection of external light when viewed in an oblique direction; a phase difference film; and a circularly polarizing plate. This display device has an organic electroluminescent display panel, and a circularly polarizing plate arranged on the display panel, in which the circularly polarizing plate has a polarizer and a phase difference film, the phase difference film has, from a side of the polarizer, a negative A-plate, and a positive A-plate, the in-plane retardation of the negative A-plate at a wavelength of 550 nm is more than 50 nm and less than 90 nm, and the in-plane retardation of the positive A-plate at a wavelength of 550 nm is 100 to 200 nm, and the angle formed by the in-plane slow axis of the negative A-plate and the in-plane slow axis of the positive A-plate is 4510.

A composition for coating a medical device and a coated medical device are provided. The composition includes a polymeric matrix having non-toxic quantum dots or a fluorophore or both. The polymeric matrix contains the quantum dots or fluorophore and binds as a coating to the medical device. Coated medical devices can be readily identified within or outside of a body and in open or laparascopical surgeries, greatly reducing or eliminating the risk of a retained foreign object.

The present invention provides polymer composites, such as films, having dispersed therein quantum dots, wherein the polymer comprises (b) polymerized units of a first compound comprising from one to 6 thiol groups, the compound having a molecular weight from 300 to 20,000 and having at least one continuous acyclic hydrocarbyl chain of at least three carbon atoms, or, preferably, at least 5 carbon atoms; and (c) polymerized units of a second compound having a molecular weight from 100 to 750 and comprising at least two polymerizable vinyl groups as part of a (meth)acrylate ester group or attached directly to an aromatic ring and, wherein the molecular weight of the first compound minus the molecular weight of the second compound is at least 100. The polymer composites provide more stably dispersed and durable quantum dot compositions for use in, for example, display devices.

Embodiments provide a mixed solvent for a quantum dot ink composition, wherein the mixed solvent includes at least two solvents, an R.sub.1 value of the mixed solvent is greater than or equal to about 7.3 Mpa.sup.0.5, an R.sub.2 value of the mixed solvent is greater than or equal to about 5.0 Mpa.sup.0.5, and a molar volume of the mixed solvent is greater than or equal to about 160 cm.sup.3/mol.

A quantum dot including a core and a shell disposed on the core wherein one of the core and the shell includes a first semiconductor nanocrystal including zinc and sulfur and the other of the core and the shell includes a second semiconductor nanocrystal having a different composition from the first semiconductor nanocrystal, the first semiconductor nanocrystal further includes a metal and a halogen configured to act as a Lewis acid in a halide form, an amount of the metal is greater than or equal to about 10 mole percent (mol %) based on a total number of moles of sulfur, and an amount of the halogen is greater than or equal to about 10 mol % based on a total number of moles of sulfur, a method of producing the same, and a composite and an electronic device including the same.

The present disclosure provides a weakly-confined semiconductor nanocrystal, a preparation method therefor and use thereof. A size of the nanocrystals is larger than an exciton diameter thereof; excitons in the nanocrystal are dynamic excitons, electron-hole Coulomb interaction of the dynamic excitons is insufficient to bind electrons and holes into stable bound excitons at operating temperatures, and the electrons and the holes of the dynamic excitons are constrained by boundaries of the nanocrystal. Since the excitons in the weakly-confined nanocrystals herein possess the characteristics of dynamic excitons, the nanocrystals herein possess unique optical and photoelectric properties distinct from conventional semiconductor nanomaterials. It holds unique value for applications requiring broad-spectrum emission (such as lighting) and significant importance for photovoltaic solar devices, photoelectric detectors, and photocatalysis.

A semiconductor quantum dot structure includes a core and a shell. The core includes a seed crystal made of a first compound M1C1, a core layer, and a barrier layer grown in such order. The seed crystal has first regions that are inactive with oxygen, and second regions that are easily reactive with oxygen. The core layer is made of the first compound M1C1, and has first and second areas. Each of the first areas is positioned on a corresponding one of the first regions. Each of the second areas is positioned on a corresponding one of the second regions. Each of the first areas has a thickness greater than that of each of the second areas. The barrier layer is made of a second compound selected from M1X1 and X2C1. The shell is grown on the barrier layer, and is made of a third compound M2C2.