A liquid crystal display according to an exemplary embodiment of the present invention includes a display panel and a light assembly configured to provide light to the display panel, wherein the light assembly includes: a light-emitting device configured to emit first light; a light guide positioned to receive the first light; and a quantum dot sheet positioned on the light guide and positioned to receive the first light from the light guide, the quantum dot sheet configured to emit second light responsive to the received first light. The quantum dot sheet includes a nanophosphor and an antioxidant, and the antioxidant includes at least one compound selected from a group including a phenol-based compound, a phosphorus-based compound, and a sulfur-based compound.