Light emitting device and light emitting display device including the same

A light emitting device comprising:

• a first electrode and a second electrode facing each other and spaced apart from each other;
• a plurality of stacks between the first electrode and the second electrode;
• and
• a charge generation layer between the plurality of stacks,
• wherein one of the plurality of stacks comprises a blue fluorescent light emitting layer and a non-blue phosphorescent light emitting layer in contact with each other, and at least one of remaining stacks comprises a single light emitting layer,
• the non-blue phosphorescent light emitting layer comprises:
• a first host, and
• a first dopant having a first triplet excitation level and a first singlet-triplet excitation level difference, and
• the blue fluorescent light emitting layer comprises:
• a second dopant having:
• a second singlet-triplet excitation level difference that is smaller than the first singlet-triplet excitation level difference, and
• a second triplet excitation level that is higher than the first triplet excitation level;
• and
• a second host having a third triplet excitation level between the first triplet excitation level and the second triplet excitation level.

A light emitting device comprising:

• a first electrode and a second electrode facing each other and spaced apart from each other;
• a plurality of stacks between the first electrode and the second electrode;
• and
• a charge generation layer between the plurality of stacks,
• wherein the plurality of stacks includes a first stack comprising a blue fluorescent light emitting layer and a non-blue phosphorescent light emitting layer in contact with each other, and at least one of remaining stacks comprises a single light emitting layer,
• the non-blue phosphorescent light emitting layer comprises:
• a first host, and
• a first dopant having a first triplet excitation level and a first singlet-triplet excitation level difference, and
• the blue fluorescent light emitting layer comprises:
• a second dopant having:
• a second singlet-triplet excitation level difference that is smaller than the first singlet-triplet excitation level difference, and
• a second triplet excitation level that is higher than the first triplet excitation level;
• and
• a second host comprising a core compound and a spacer disposed at a distance of 1 nm or more from an outer surface of the core compound.