Light emitting device and display apparatus including the same

A light emitting device, comprising:

• a first electrode;
• a hole transport region on the first electrode;
• a plurality of first emission layers on the hole transport region, the plurality of first emission layers being to emit light of a first wavelength;
• a second emission layer on the hole transport region, the second emission layer being to emit light of a second wavelength different from the first wavelength;
• an electron transport region on the first emission layer and the second emission layer;
• and
• a second electrode on the electron transport region,
• wherein the plurality of first emission layers comprise a first first-emission layer, a second first-emission layer, and a third first-emission layer,
• wherein at least one selected from the first first-emission layer, the second first-emission layer, and the third first-emission layer comprises:
• a first sub-emission layer comprising a first hole transport host and a first sub-dopant, the first sub-emission layer being to emit the light of the first wavelength;
• and
• a second sub-emission layer comprising a first electron transport host different from the first hole transport host and a second sub-dopant, the second sub-emission layer being to emit the light of the first wavelength.

A display apparatus, comprising:

• a substrate comprising a first pixel region to emit light of a first wavelength, a second pixel region to emit light of a second wavelength different from the first wavelength, and a third pixel region to emit light of a third wavelength different from the first and second wavelengths;
• and
• a plurality of light emitting devices on the substrate and overlapping the first pixel region, the second pixel region, and the third pixel region,
• wherein each of the plurality of light emitting devices comprises:
• a first electrode;
• a hole transport region on the first electrode;
• a first emission layer on the hole transport region and to emit the light of the first wavelength;
• a second emission layer on the hole transport region and to emit the light of the second wavelength;
• an electron transport region on the first emission layer and the second emission layer;
• and
• a second electrode on the electron transport region,
• wherein the first emission layer comprises:
• a first sub-emission layer comprising a first hole transport host and a first sub-dopant, the first sub-emission layer being to emit the light of the first wavelength;
• and
• a second sub-emission layer comprising a first electron transport host different from the first hole transport host and a second sub-dopant, the second sub-emission layer being to emit the light of the first wavelength, and
• wherein the second emission layer comprises a second hole transport host, a second electron transport host, and a second dopant, the second emission layer being to emit the light of the second wavelength.