A quantum dot including zinc, tellurium, selenium, and sulfur, wherein the quantum dot comprises a core and a shell disposed on the core, and wherein the quantum dot is a cadmium-free red light-emitting quantum dot and has an emission peak wavelength of greater than or equal to about 600 nanometers (nm), and efficiency of greater than or equal to about 50%.

A nanoparticle ink composition includes: a solvent; and one or more inorganic nanoparticles substantially dispersed in the solvent, wherein the inorganic nanoparticles include one or more quantum dots or a metal oxide having a diameter of about 20 nm or less, and the nanoparticle ink composition has an Ohnesorge number of about 0.1 to about 0.2.

Method for manufacturing a composite material combining a metal oxide or metalloid based matrix suited for allowing light to pass, and a mineral pigment dispersed in the matrix, the method comprising a step of mixing the mineral pigment in powder form with the matrix in powder form, and a step of sintering of the mixture under sufficient pressure such that the densification temperature of the matrix under said pressure is below the breakdown temperature of the mineral pigment, where the sintering temperature is greater than or equal to the densification temperature of the matrix and below the breakdown temperature of the mineral pigment.

The present invention relates to a technology for producing a black pearlescent pigment for cosmetics which is a human-friendly and nature-friendly by using a pigment including natural charcoal powder. The production method of the pearlescent pigment using natural charcoal according to the present invention includes (a) milling natural charcoal to produce a pigment including natural charcoal powder; and (b) coating a flake substrate with the produced pigment including the natural charcoal powder, wherein the milling is performed at 20 to 40 Hz for 24 to 72 hours, and an average particle size of the pigment including the natural charcoal powder is 100 to 300 nm.

Provided are metal halide perovskite light emitting device and method of manufacturing the same. The metal halide perovskite light emitting device uses perovskite film having a multi-dimensional crystal structure derived from a proton transfer reaction as light emitting layer. Due to self-assembled shell of the perovskite film, ion movement is suppressed and surface defects are removed. Thereby, photoluminescence intensity, luminescence efficiency and lifetime are improved. By injecting a fluorine-based material and a basic material into the PEDOT:PSS conductive polymer used as the conventional hole injection layer, the acidity is controlled and the work function of the interface is improved. Furthermore, chemically stable graphene barrier layer protects the electrode vulnerable to acid, so that a high-efficiency light emitting device can be manufactured.

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.

The present invention provides compositions with increased color shade stability comprising organic pigments and TiO.sub.2. The combination of specific ingredients disclosed herein prevents the color migration often associated with organic pigments including azo based dyes and lakes.

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 copper oxide coated pigment including a particle having an outer surface, and a layer of copper oxide on the outer surface. The pigment has a reflectivity of electromagnetic radiation in a visible spectrum less than or equal to 5%, and a reflectivity of electromagnetic radiation in a near-IR and LiDAR spectrum greater than or equal to 5%. The particle is cobalt oxide or carbon black. A method for forming copper oxide coated particles includes combining a precipitating agent with a solution of copper nitrate and particles, forming coated particles. The particles are cobalt oxide or carbon black. Washing the particles, obtaining washed coated particles, and filtering the washed coated particles, obtaining filtered coated particles. Drying the filtered coated particles, obtaining dried coated particles, and calcining the dried coated particles to form the copper oxide coated particles.

Disclosed in certain embodiments is a composition comprising a structural colorant comprising photonic particles comprising a metal oxide and from about 0.1% to about 50% w/w of an organic material.