Light-emitting device and display apparatus including the same

A display apparatus comprising:

• a first pixel configured to emit light of a first wavelength;
• and
• a second pixel configured to emit light of a second wavelength different from the first wavelength,
• wherein the first pixel comprises:
• a reflective layer comprising a plurality of nano-structures two-dimensionally disposed regularly and a low-refractive-index layer disposed adjacent to the plurality of nano-structures;
• a first electrode disposed on the reflective layer;
• an organic emission layer disposed on the first electrode and configured to emit visible light comprising light of the first wavelength and light of the second wavelength;
• and
• a second electrode disposed on the organic emission layer,
• wherein each of the plurality of nano-structures comprises a non-metallic material, and the low-refractive-index layer comprises a dielectric material having a second refractive index lower than a first refractive index of the non-metallic material.