Organic light-emitting device

An organic light-emitting device comprising:

• a first electrode;
• a second electrode facing the first electrode;
• a plurality of light-emitting units, in the number of m, disposed between the first electrode and the second electrode, each light-emitting unit comprising an emission layer;
• and
• a plurality of charge generation layers, in the number of m−1, disposed between two adjacent light-emitting units among the plurality of light-emitting units, each charge generation layer comprising an n-type charge generation layer and a p-type charge generation layer,
• wherein
• m is an integer of 2 or more,
• a maximum emission wavelength of light emitted by at least one light-emitting unit among the plurality of light-emitting units is different from a maximum emission wavelength of light emitted by at least one other light-emitting unit among the plurality of light-emitting units,
• the emission layer comprises a first compound, a second compound, and a third compound, and the first compound and the second compound are different from each other,
• each of the first compound and the second compound emits light,
• the third compound does not emit light,
• the first compound and the second compound satisfy one of Conditions 1 to 4:
• wherein Condition 1 comprises:
• 400 nanometers≤λmax1<500 nanometers, and
• 400 nanometers≤λmax2<500 nanometers,
• wherein Condition 2 comprises:
• 500 nanometers≤λmax1<550 nanometers, and
• 500 nanometers≤λmax2<550 nanometers,
• wherein Condition 3 comprises:
• 550 nanometers≤λmax1<620 nanometers, and
• 550 nanometers≤λmax2<620 nanometers, or
• wherein Condition 4 comprises:
• 620 nanometers≤λmax1<700 nanometers, and
• 620 nanometers≤λmax2<700 nanometers,
• the first compound and the second compound satisfy Inequality (1-1) or )1-2):
• PLS(C1)≤PLS(C2) (1-1)
• (λmax2−λmax1)+PLS(C1)≤PLS(C2) (1-2),
• the first compound and the second compound satisfy Inequality (2):
• kr(C1)≥kr(C2) (2), and
• wherein, in Conditions 1 to 4 and Inequalities (1-1), (1-2), and )2),
• λmax1 is a maximum emission wavelength of the first compound,
• λmax2 is a maximum emission wavelength of the second compound,
• PLS(C1) is photostability of the first compound,
• PLS(C2) is photostability of the second compound,
• kr(C1) is a radiative decay rate of the first compound, and
• kr(C2) is a radiative decay rate of the second compound.

An organic light-emitting device comprising:

• a first electrode;
• a second electrode facing the first electrode;
• and
• a plurality of emission layers, in the number of m, disposed between the first electrode and the second electrode,
• wherein
• m is an integer of 2 or more,
• a maximum emission wavelength of light emitted by at least one emission layer among the plurality of emission layers is different from a maximum emission wavelength of light emitted by at least one other emission layer among the plurality of emission layers,
• the emission layer comprises a first compound, a second compound, and a third compound, and the first compound and the second compound are different from each other,
• each of the first compound and the second compound emits light,
• the third compound does not emit,
• the first compound and the second compound satisfy one of Conditions 1 to 4:
• wherein Condition 1 comprises:
• 400 nanometers≤λmax1<500 nanometers, and
• 400 nanometers≤λmax2<500 nanometers,
• wherein Condition 2 comprises:
• 500 nanometers≤λmax1<550 nanometers, and
• 500 nanometers≤λmax2<550 nanometers,
• wherein Condition 3 comprises:
• 550 nanometers≤λmax1<620 nanometers, and
• 550 nanometers≤λmax2<620 nanometers, or
• wherein Condition 4 comprises:
• 620 nanometers≤λmax1<700 nanometers, and
• 620 nanometers≤λmax2<700 nanometers,
• the first compound and the second compound satisfy Inequality (1-1) or )1-2):
• PLS(C1)≤PLS(C2) (1-1)
• (λmax2−λmax1)+PLS(C1)≤PLS(C2) (1-2),
• the first compound and the second compound satisfy Inequality (2):
• kr(C1)≥kr(C2) (2), and
• wherein, in Conditions 1 to 4 and Inequalities (1-1), (1-2), and )2),
• λmax1 is a maximum emission wavelength of the first compound,
• λmax2 is a maximum emission wavelength of the second compound,
• PLS(C1) is photostability of the first compound,
• PLS(C2) is photostability of the second compound,
• kr(C1) is a radiative decay rate of the first compound, and
• kr(C2) is a radiative decay rate of the second compound.