Disclosed are a method for producing carbon quantum dots having color change based on a cumulative amount of exposure thereof to UV light, and to a color change sensor including the same that indicates a cumulative UV amount. The method for producing the carbon quantum dots include performing solvothermal reaction on blue inkjet printer dye, urea and an organic solvent in a high pressure reactor.

Disclosed are a method for producing carbon quantum dots having color change based on a cumulative amount of exposure thereof to UV light, and to a color change sensor including the same that indicates a cumulative UV amount. The method for producing the carbon quantum dots include performing solvothermal reaction on blue inkjet printer dye, urea and an organic solvent in a high pressure reactor.

An ink composition and luminescent nanostructure composite, and an electronic device including the luminescent nanostructure composite. The ink composition includes a plurality of titanium oxide particles, a plurality of luminescent nanostructures (e.g., quantum dots), a monomer including a carbon-carbon unsaturated bond, and optionally an organic solvent. The titanium oxide particles have an average size of greater than or equal to about 10 nm and less than or equal to about 900 nm, and the titanium oxide particles comprise an organosilane compound. The ink composition has a total solid content (TSC) of greater than or equal to about 90 wt %, and an amount of the titanium oxide particles in the ink composition is greater than or equal to about 1 wt % based on the total weight of the ink composition. The ink composition is configured to emit a first light.

An ink composition and luminescent nanostructure composite, and an electronic device including the luminescent nanostructure composite. The ink composition includes a plurality of titanium oxide particles, a plurality of luminescent nanostructures (e.g., quantum dots), a monomer including a carbon-carbon unsaturated bond, and optionally an organic solvent. The titanium oxide particles have an average size of greater than or equal to about 10 nm and less than or equal to about 900 nm, and the titanium oxide particles comprise an organosilane compound. The ink composition has a total solid content (TSC) of greater than or equal to about 90 wt %, and an amount of the titanium oxide particles in the ink composition is greater than or equal to about 1 wt % based on the total weight of the ink composition. The ink composition is configured to emit a first light.

An ink set includes an inkjet ink and a recording head filling liquid. The inkjet ink contains a pigment, a pigment covering resin, a glycol ether compound, a first polyhydric alcohol compound, and water. The recording head filling liquid contains polyethylene glycol, a second polyhydric alcohol compound, a nonionic surfactant, and water. The polyethylene glycol has a mass average molecular weight of at least 190 and no greater than 420. A percentage content of the polyethylene glycol in the recording head filling liquid is at least 0.7% by mass and no greater than 12.0% by mass. A percentage content of the second polyhydric alcohol compound in the recording head filling liquid is at least 15.0% by mass and no greater than 45.0% by mass.

An ink set includes an inkjet ink and a recording head filling liquid. The inkjet ink contains a pigment, a pigment covering resin, a glycol ether compound, a first polyhydric alcohol compound, and water. The recording head filling liquid contains polyethylene glycol, a second polyhydric alcohol compound, a nonionic surfactant, and water. The polyethylene glycol has a mass average molecular weight of at least 190 and no greater than 420. A percentage content of the polyethylene glycol in the recording head filling liquid is at least 0.7% by mass and no greater than 12.0% by mass. A percentage content of the second polyhydric alcohol compound in the recording head filling liquid is at least 15.0% by mass and no greater than 45.0% by mass.

An ink-jet ink composition contains water, a colorant, and resin particles made of a material containing polyester. The polyester has a sulfo group and contains a diol component and a dicarboxylic acid component. The diol component contains a diol component having a 1,3-propanediol skeleton.

An ink-jet ink composition contains water, a colorant, and resin particles made of a material containing polyester. The polyester has a sulfo group and contains a diol component and a dicarboxylic acid component. The diol component contains a diol component having a 1,3-propanediol skeleton.

A system and method for production and implementation of a photonic crystal forming, aqueous solution, may include: a block polymer mixture and at least one solvent, wherein the at least one solvent comprises water. The “color” of the photonic crystal solution may be set either through a single, or multiple, brush block copolymer mixtures (i.e., premixed coloring) or through layering of multiple layers of distinct single, or multiple, brush block copolymer mixtures. The system functions as an aqueous structural color (i.e., a photonic crystal) precursor, wherein applying the water-based color solution to a substrate, functions to provide a desired photonic crystal object arrangement possessing color reflective properties.

A system and method for production and implementation of a photonic crystal forming, aqueous solution, may include: a block polymer mixture and at least one solvent, wherein the at least one solvent comprises water. The “color” of the photonic crystal solution may be set either through a single, or multiple, brush block copolymer mixtures (i.e., premixed coloring) or through layering of multiple layers of distinct single, or multiple, brush block copolymer mixtures. The system functions as an aqueous structural color (i.e., a photonic crystal) precursor, wherein applying the water-based color solution to a substrate, functions to provide a desired photonic crystal object arrangement possessing color reflective properties.