A semiconductor nanoparticle, a production method thereof, and an electroluminescent device including the same. The production method includes: combining a magnesium precursor and an additive with a chalcogen precursor in a reaction medium including an organic solvent and an organic ligand; heating the reaction medium to a reaction temperature; and reacting the magnesium precursor and the chalcogen precursor in the presence of the additive to form a magnesium chalcogenide, wherein the semiconductor nanoparticle comprises the magnesium chalcogenide, wherein the magnesium chalcogenide comprises magnesium; and selenium, sulfur, or a combination thereof, and wherein the additive includes a hydride compound including an alkali metal, calcium, barium, aluminum, or a combination thereof.

Solution for use in filling micrometer-size cavities (10), the solution comprising a first solvent, a first polymer (102) having a first molecular weight, a second polymer (103) having a second molecular weight, luminophores (101) and a surfactant, the second molecular weight being 10 to 50 times greater than the first molecular weight.

The present disclosure provides II-VI based non-Cd visible light emitting quantum dots (QDs) and a manufacturing method thereof to solve the problems with broad full width at half maximum (FWHM) and low quantum efficiency. The present disclosure further provides a QD light emitting diode (QLED) using the II-VI based non-Cd visible light emitting QDs. The QDs according to the present disclosure include a II-VI based ternary ZnSeTe core, wherein a Se:Te ratio in the ZnSeTe core is 1:10 to 100:1. According to the present disclosure, it is possible to provide QDs that emit visible light ranging from red to blue by adjusting the Se:Te ratio in the II-VI based ternary ZnSeTe core.

Disclosed are a phosphor sheet capable for converting light from LEDs into white light, a white light source device including the phosphor sheet, and a display device including the white light source device. The disclosed phosphor sheet includes a phosphor layer containing at least a phosphor and a resin; and a pair of transparent substrates sandwiching the phosphor layer. The phosphor sheet comprises a coloring material having an absorption maximum wavelength of at least one of from 480 nm to 510 nm or from 570 nm to 620 nm. The coloring material is contained in the phosphor layer. The transparent substrates are adhered to both surfaces of the phosphor layer. the phosphor layer has a thickness of 20 μm to 200 μm. An indicator of the usage amount of the coloring material defined by the following formula is 0.003 to 0.028: (indicator of the usage amount of the coloring material)=((blending amount of the coloring material in the phosphor layer)/(blending amount of a resin in the phosphor layer))×(the thickness of the phosphor layer (μm)).

The present disclosure provides a quantum dot light-emitting device, a preparing method and a display device. The quantum dot light-emitting device includes an anode, a hole transport layer, a quantum dot light-emitting layer, an electron transport layer and a cathode laminated one on another. The quantum dot light-emitting layer includes heterodimer quantum dots, the heterodimer quantum dots include first quantum dots carrying a positive charge and second quantum dots carrying a negative charge, and each first quantum dot and each second quantum dot have a same energy gap and different positions of conduction band and valence band.

A cadmium free quantum dot including a core that includes a first semiconductor nanocrystal including zinc, tellurium, and selenium, and a semiconductor nanocrystal shell that is disposed on the core and includes a zinc chalcogenide, wherein the quantum dot further includes magnesium and the mole ratio of Te:Se is greater than or equal to about 0.1:1 in the quantum dot; a production method thereof; and an electronic device including the same.

Solution for use in filling micrometer-size cavities (10), the solution comprising a first solvent, a first polymer (102) having a first molecular weight, a second polymer (103) having a second molecular weight, luminophores (101) and a surfactant, the second molecular weight being 10 to 50 times greater than the first molecular weight.

The present disclosure provides II-VI based non-Cd visible light emitting quantum dots (QDs) and a manufacturing method thereof to solve the problems with broad full width at half maximum (FWHM) and low quantum efficiency. The present disclosure further provides a QD light emitting diode (QLED) using the II-VI based non-Cd visible light emitting QDs. The QDs according to the present disclosure include a II-VI based ternary ZnSeTe core, wherein a Se:Te ratio in the ZnSeTe core is 1:10 to 100:1. According to the present disclosure, it is possible to provide QDs that emit visible light ranging from red to blue by adjusting the Se:Te ratio in the II-VI based ternary ZnSeTe core.

Provided is a partial drive-type light source device including an excitation light source that is formed from a plurality of light-emitting elements and is partially drivable, a phosphor sheet disposed at a position separated from the excitation light source and containing a phosphor that converts at least part of a wavelength region of incident light from the excitation light source and releases emitted light in a wavelength region differing from the incident light, and a wavelength-selective reflection film that is disposed between the excitation light source and the phosphor sheet and that transmits at least part of light in the wavelength region of the incident light from the excitation light source and reflects at least part of light in the wavelength region of the emitted light from the phosphor sheet.

Disclosed are a phosphor sheet capable of improving color purity of each of RGB reproduced through a color filter, a white light source device including the phosphor sheet, and a display device including the white light source device. The disclosed phosphor sheet is a phosphor sheet for converting LED light into white light, including: a phosphor layer containing at least a phosphor and a resin; and a pair of transparent substrates sandwiching the phosphor layer, in which the phosphor sheet includes a coloring material having an absorption maximum wavelength of at least one of from 480 nm to 510 nm or from 570 nm to 620 nm.