A light emitting device includes a light source configured to emit a primary light, a first phosphor that absorbs the primary light and converts the primary light into a first wavelength-converted light having a wavelength longer than that of the primary light, and a second phosphor that absorbs the primary light and converts the primary light into a second wavelength-converted light having a wavelength longer than that of the primary light. The first wavelength-converted light is a fluorescence having a light component over an entire wavelength range of 700 nm or more to 800 nm or less. The second wavelength-converted light is a fluorescence having a peak where a fluorescence intensity shows a maximum value in a wavelength range of 380 nm or more to less than 700 nm. The first wavelength-converted light has a 1/10 afterglow time longer than that of the second wavelength-converted light.

A quantum dot includes a core, a first shell and a second shell. The core includes a group III-V compound. The first shell includes a second semiconductor nanocrystal. The second semiconductor nanocrystal includes zinc, selenium and a dopant including tellurium. The second shell includes a third semiconductor nanocrystal. The third semiconductor nanocrystal includes a II-VI compound.

A quantum dot includes a core, a first shell and a second shell. The core includes a group III-V compound. The first shell includes a second semiconductor nanocrystal. The second semiconductor nanocrystal includes zinc, selenium and a dopant including tellurium. The second shell includes a third semiconductor nanocrystal. The third semiconductor nanocrystal includes a II-VI compound.

Production method for metal oxide fine particles includes: a step of mixing a fatty acid represented by C.sub.nH.sub.2nO.sub.2 (n=5 to 14) and a metal source consisting of a metal, metal oxide, or metal hydroxide of at least two metal elements selected from the group consisting of Zn, In, Sn, and Sb to obtain a mixture; a step of heating the mixture at a temperature that is equal to or higher than a melting temperature of the fatty acid and lower than a decomposition temperature of the fatty acid to obtain a metal soap which is a precursor of metal oxide fine particles; and a step of heating the precursor at a temperature that is equal to or higher than a melting temperature of the precursor and lower than a decomposition temperature of the precursor to obtain metal oxide fine particles having an average particle diameter of 80 nm or less.

The present invention relates to an orthogonal-phase compound and its nonlinear optical (NLO) crystal of BaGa.sub.7Se.sub.7, its producing method and uses thereof. Polycrystalline orthogonal-phase BaGa.sub.4Se.sub.7 was prepared by a high-temperature solid-phase reaction in a sealed silica tube. Large size single crystals of orthogonal-phase BaGa.sub.4Se.sub.7 could be prepared by the flux method or Bridgman method. BaGa.sub.4Se.sub.7 crystallizes in the point group mm2. Orthogonal-phase BaGa.sub.4Se.sub.7 has a powder second harmonic generation (SHG) efficiency of about 5 times that of AgGaS.sub.2 and is phase-matchable. The orthogonal-phase BaGa.sub.4Se.sub.7 is non-hygroscopic and has good mechanical properties, which makes it easy to cut, polish, and coat by normal processing. The orthogonal-phase BaGa.sub.4Se.sub.7 crystal has never been cracked during cutting and polishing. The orthogonal-phase compound and NLO crystal of BaGa.sub.4Se.sub.7 can be used as NLO devices.

Disclosed are stable films comprising Ag, In, Ga, and S (AIGS) nanostructures, or more one metal alkoxides, one or more metal alkoxide hydrolysis products, one or more metal halides, one or more metal halide hydrolysis products, one or more organometallic compounds, or one or more organometallic hydrolysis products, or combinations thereof, and at least one ligand bound to the nanostructures. In some embodiments, the AIGS nanostructures have a photon conversion efficiency of greater than 32% and a peak wavelength emission of 480-545 nm. In some embodiments, the nanostructures have an emission spectrum with a FWHM of 24-38 nm. In some embodiments, the nanostructures have a photon conversion efficiency (PCE) of at least 30% after being stored for 24 hours under yellow light and air storage conditions.

A color filter including a first pixel (or color conversion region) that is configured to emit a first light and a display device including the color filter. The first pixel includes a (first) quantum dot composite (or a color conversion layer including the quantum dot composite), wherein the quantum dot composite may include a matrix and a plurality of quantum dots dispersed (e.g., randomly) in the matrix, wherein the plurality of the quantum dots exhibit a multi-modal distribution (e.g., a bimodal distribution) including a first peak particle size and a second peak particle size in a size analysis, wherein the second peak particle size is greater than the first peak particle size, and a difference between the first peak particle size and the second peak particle size is less than or equal to about 5 nanometers (nm) (e.g., less than or equal to about 4.5 nm).

A color filter including a first layer including first quantum dots and a second layer including second quantum dots that are different from the first quantum dots, and disposed on the first layer, wherein a quantum yield of the first quantum dots is greater than a quantum yield of the second quantum dots, and wherein an absorption of blue light of the second quantum dots is greater than an absorption of the blue light of the first quantum dots.

There is provided a near-infrared absorbing fine particle dispersion liquid containing near-infrared absorbing fine particles, thereby as well as exhibiting near-infrared light absorption properties and suppressing a scorching sensation on the skin when used in structures such as window materials and the like, also enabling usage of communication devices, imaging devices, sensors and the like that employ near-infrared light through these structures, a near-infrared absorbing film or a near-infrared absorbing glass, a dispersion body or a laminated transparent substrate, the dispersion liquid containing at least composite tungsten oxide fine particles and antimony doped tin oxide fine particles and/or tin doped indium oxide fine particles as near-infrared absorbing fine particles, wherein in the composite tungsten oxide fine particles, an average value of a transmittance in a wavelength range of 800 to 900 nm is 30% or more and 60% or less, and an average value of a transmittance in a wavelength range of 1200 to 1500 nm is 20% or less, and a transmittance at a wavelength of 2100 nm is 22% or less, when a visible light transmittance is 85% at the time of calculating only light absorption by the composite tungsten oxide fine particles, and containing mixed particles of the composite tungsten oxide fine particles and antimony-doped tin oxide fine particles and/or tin-doped indium oxide fine particles dispersed in a liquid medium, wherein the liquid medium is selected from rater, an organic solvent, an oil and fat, a liquid resin, a liquid plasticizer for plastics, or a mixture thereof, wherein when a visible light transmittance is adjusted to 85% at the time of calculating only light absorption by the near-infrared absorbing fine particles in the dispersion liquid by diluting with the liquid medium, an average value of a transmittance in the wavelength range of 800 to 900 nm is 30% or more and 60% or less, an average value of a transmittance in the wavelength range of 1200 to 1500 nm is 20% or less, and a transmittance at the wavelength of 2100 nm is 11% or less.

There is provided a near-infrared absorbing fine particle dispersion liquid containing near-infrared absorbing fine particles, thereby as well as exhibiting near-infrared light absorption properties and suppressing a scorching sensation on the skin when used in structures such as window materials and the like, also enabling usage of communication devices, imaging devices, sensors and the like that employ near-infrared light through these structures, a near-infrared absorbing film or a near-infrared absorbing glass, a dispersion body or a laminated transparent substrate, the dispersion liquid containing at least composite tungsten oxide fine particles and antimony doped tin oxide fine particles and/or tin doped indium oxide fine particles as near-infrared absorbing fine particles, wherein in the composite tungsten oxide fine particles, an average value of a transmittance in a wavelength range of 800 to 900 nm is 30% or more and 60% or less, and an average value of a transmittance in a wavelength range of 1200 to 1500 nm is 20% or less, and a transmittance at a wavelength of 2100 nm is 22% or less, when a visible light transmittance is 85% at the time of calculating only light absorption by the composite tungsten oxide fine particles, and containing mixed particles of the composite tungsten oxide fine particles and antimony-doped tin oxide fine particles and/or tin-doped indium oxide fine particles dispersed in a liquid medium, wherein the liquid medium is selected from rater, an organic solvent, an oil and fat, a liquid resin, a liquid plasticizer for plastics, or a mixture thereof, wherein when a visible light transmittance is adjusted to 85% at the time of calculating only light absorption by the near-infrared absorbing fine particles in the dispersion liquid by diluting with the liquid medium, an average value of a transmittance in the wavelength range of 800 to 900 nm is 30% or more and 60% or less, an average value of a transmittance in the wavelength range of 1200 to 1500 nm is 20% or less, and a transmittance at the wavelength of 2100 nm is 11% or less.