Sensors for detecting and distinguishing metals in a sample comprise phenol group-containing azo dyes, the phenol group having one hydroxy involved in reversible metal ion binding and a second hydroxy alkylated to an optically transparent substrate. The sensors have utility for detecting chromium, calcium, magnesium, copper, mercury, nickel, zinc, cobalt, manganese, cadmium, lead, tin, aluminum, potassium, sodium, or arsenic ions in a sample.

Provided herein are dyes for detecting and distinguishing metals in a sample, as well as compositions and methods comprising the same.

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A display device includes: a light unit for emitting blue light; a color conversion panel on the light unit; a display panel between the light unit and the color conversion panel, the display panel comprising transistors; and column spacers between the transistors and the color conversion panel, the column spacers overlapping the transistors. The color conversion panel includes: a substrate; color conversion layers between the substrate and the display panel, the color conversion layers comprising semiconductor nanocrystals; a transmission layer between the substrate and the display panel; and polarization layers between the color conversion layers and the display panel and between the transmission layer and the display panel. The column spacers include a pigment that absorbs blue light.

Provided are a coloring composition capable of forming a film having excellent light resistance, a film, a color filter, a display device, and a structure body. The coloring composition contains a colorant A, a resin, and a solvent, in which the colorant A contains a Color Index Pigment Green 7, a Color Index Pigment Yellow 185, and a colorant a including three or more colorants selected from colorants other than the Color Index Pigment Green 7 and the Color Index Pigment Yellow 185, and the coloring composition contains 200 to 3,000 parts by mass of the Color Index Pigment Green 7 with respect to 100 parts by mass of the Color Index Pigment Yellow 185.