Light-emitting device and electronic apparatus including the same

A light-emitting device comprising:

• a first electrode;
• a second electrode facing the first electrode;
• m emitting units between the first electrode and the second electrode;
• and
• m−1 charge generation layers between adjacent ones of the m emitting units, and each comprising an n-type charge generation layer and a p-type charge generation layer, wherein
• m is an integer of 2 or more,
• at least one emitting unit of the m emitting units comprises a first emission layer, a second emission layer, a first electron transport layer, a second electron transport layer, and a third electron transport layer,
• the first emission layer comprises a first host compound and a first dopant compound,
• the second emission layer comprises a second host compound and a second dopant compound,
• the first electron transport layer comprises a first compound,
• the third electron transport layer comprises a second compound and a third compound,
• the second electron transport layer comprises the first compound, the second compound, and the third compound,
• the second compound and/or the third compound each independently comprises a phosphine oxide-based compound and/or a phenanthroline-based compound,
• the first electron transport layer and the second emission layer contact each other,
• the second electron transport layer is between the first electron transport layer and the third electron transport layer,
• the third electron transport layer and an n-type charge generation layer of the m−1 charge generation layers contact each other, and
• each of the first electron transport layer, the second electron transport layer, and the third electron transport layer does not comprise a metal complex.