Organic light emitting diode and organic light emitting display including the same

An organic light emitting diode comprising:

• a first electrode;
• a light emitting stack disposed on the first electrode;
• and
• a second electrode disposed on the light emitting stack,
• wherein the light emitting stack comprises a hole transport layer and a blue light emitting layer such that the hole transport layer and the blue light emitting layer are sequentially stacked on the first electrode, the blue light emitting layer comprising a blue host material and a blue fluorescent dopant material, and the hole transport layer comprising a hole transport layer material,
• wherein:
• the blue fluorescent dopant material has a higher LUMO (Lowest Unoccupied Molecular Orbital) energy level than the blue host material;
• the blue fluorescent dopant material has a higher HOMO (Highest Occupied Molecular Orbital) energy level than the blue host material;
• the hole transport layer material has a higher HOMO energy level than the blue host material;
• the hole transport layer material has a higher HOMO energy level than the blue fluorescent dopant material and a difference in the HOMO energy levels between the hole transport layer material and the blue fluorescent dopant material is 0.1 eV or less;
• and
• the blue fluorescent dopant material has a lower singlet energy level than the blue host material.