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 light-emitting units stacked between the first electrode and the second electrode and including emission layers;
• and
• m-1 charge generation layers disposed between two neighboring light-emitting units from among the m light-emitting units, wherein
• m is an integer of 2 or more,
• the emission layers include a first emission layer, and a second emission layer disposed between the first emission layer and the second electrode,
• the first emission layer includes a first compound and a second compound,
• the second emission layer includes a third compound and a fourth compound,
• the first compound and the second compound are different from each other,
• the third compound and the fourth compound are different from each other,
• the fourth compound includes at least one selected from an electron transport compound and a bipolar compound, and
• the first compound includes a first fluorescent compound, and the third compound includes a second fluorescent compound satisfying Equation 1, or
• the first compound includes the second fluorescent compound satisfying Equation 1, and the third compound includes the first fluorescent compound:
• ΔEST=S1−T1≤0.5 eV [Equation 1]
• wherein in Equation 1,
• S1 is the lowest excitation singlet energy level (eV) of the second fluorescent compound, and
• T1 is the lowest excitation triplet energy level (eV) of the second fluorescent compound.