Optical elements and compositions are provided which include an extruded polymer, and a plurality of fluorophores disposed within. The fluorescent compositions have quantum yields greater than 50% and are stable in performance over long durations of time under oxygen, moisture, and light exposure. In some embodiments, the extruded polymer is prepared as pellets, microparticles, nanoparticles, or films.

There are provided a photoelectric conversion film containing a quantum dot of a compound semiconductor that contains an Ag element, at least one element selected from an Sb element or a Bi element, and at least one element selected from an Se element or a Te element; a dispersion liquid that is used in the formation of the photoelectric conversion film; a photodetector element including the photoelectric conversion film; and an image sensor including the photodetector element.

A quantum dot (QD) dispersion solution includes QD phosphor particles, ligands, and a solvent. Each ligand includes a thiol group and at least one functional group of ester groups and ether groups. The solvent is propylene glycol monomethyl ether acetate.

Light emitting devices and LED-filaments comprise an excitation source (e.g. LED) and a photoluminescence material comprising a combination of a first narrow-band red photoluminescence material which generates light with a peak emission wavelength in a range 580 nm to 628 nm and a full width at half maximum emission intensity in a range 45 nm to 60 nm and a second narrow-band red photoluminescence material generates light with a peak emission wavelength in a range 628 nm to 640 nm and a full width at half maximum emission intensity in a range 5 nm to 20 nm. At least one of the first and second narrow-band red photoluminescence materials can comprise a narrow-band red phosphor or a quantum dot (QD) material.

The present disclosure relates generally to nanoparticle formulations, and more specifically to nanoparticle and ligands used for imparting low-pH solubility in a range of solvents, including photoluminescent materials such as quantum dots.

A quantum dot of the present invention is a nanocrystal represented by AgInE.sub.2 (E is at least one of tellurium, selenium, and sulfur) containing silver, indium, and chalcogen, in which a fluorescence wavelength is within a range of a near-infrared region of 700 to 1500 nm, a fluorescence full width at half maximum is 150 nm or less, and a fluorescence quantum yield is higher than 20%. In the present invention, an average particle diameter is preferably 1 nm or more and 15 nm or less. In addition, a method for producing a quantum dot of the present invention includes synthesizing a quantum dot represented by AgInE.sub.2 (E is at least one of tellurium, selenium, and sulfur) from a silver raw material, an indium raw material, and a chalcogenide raw material (chalcogenide is at least one of tellurium, selenium, and sulfur).

The present disclosure relates generally to nanoparticle formulations, and more specifically to nanoparticle and ligands used for imparting low-pH solubility in a range of solvents, including photoluminescent materials such as quantum dots.

Composite nanoparticle compositions and associated nanoparticle assemblies are described herein which, in some embodiments, exhibit enhancements to one or more thermoelectric properties including increases in electrical conductivity and/or Seebeck coefficient and/or decreases in thermal conductivity. In one aspect, a composite nanoparticle composition comprises a semiconductor nanoparticle including a front face and a back face and sidewalls extending between the front and back faces. Metallic nanoparticles are bonded to at least one of the sidewalls establishing a metal-semiconductor junction.

Provided are a quantum dot-ligand composite which includes quantum dots including a semiconductor nanocrystalline core that includes Group III and V elements and a semiconductor nanocrystalline shell that is disposed on the semiconductor nanocrystalline core and includes Group II and VI elements; and organic ligands coordinated to the quantum dots. Additionally, a quantum dot-ligand composite with high luminescence properties and stability according to the electrostatic effective binding ratio between the quantum dots and the organic ligands bound to the surface of the quantum dots, and a photosensitive resin composition, optical film, electroluminescent diode, and electronic device including the same can be provided.

Composite nanoparticle compositions and associated nanoparticle assemblies exhibit enhancements to one or more thermoelectric properties including increases in electrical conductivity and/or Seebeck coefficient and/or decreases in thermal conductivity. A composite nanoparticle composition comprises a semiconductor nanoparticle including a front face and a back face and sidewalls extending between the front and back faces. Metallic nanoparticles are bonded to at least one of the sidewalls establishing a metal-semiconductor junction.