Organic light-emitting diode, organic light-emitting display including the same, and method of manufacturing the same

A method of manufacturing an organic light-emitting diode, the method comprising:

• providing a first electrode;
• providing a light-emitting stack on the first electrode comprising, sequentially stacking on the first electrode:
• a hole transport layer comprising a hole transport layer material;
• a blue light-emitting layer comprising:
• a blue host material;
• and
• a blue fluorescent dopant material;
• and
• an electron transport layer comprising an electron transport layer material;
• and
• providing a second electrode on the light-emitting stack,
• wherein the blue fluorescent dopant material has a higher LUMO (Lowest Unoccupied Molecular Orbital) energy level than the blue host material,
• wherein the blue fluorescent dopant material has a higher HOMO (Highest Occupied Molecular Orbital) energy level than the blue host material,
• wherein the blue fluorescent dopant material has a lower singlet energy than the blue host material,
• wherein the hole transport layer material has a higher HOMO energy level than the blue host material,
• wherein the hole transport layer material has a higher HOMO energy level than the blue fluorescent dopant material,
• wherein a difference in HOMO energy level between the hole transport layer material and the blue fluorescent dopant material is 0.1 eV or less,
• wherein the hole transport layer material has a higher LUMO energy level than the blue host material,
• wherein a difference in LUMO energy level between the hole transport layer material and the blue host material is 0.5 eV or more,
• wherein the hole transport layer material has a higher LUMO energy level than the blue fluorescent dopant material,
• wherein the electron transport layer material has a higher LUMO energy level than the blue host material,
• wherein the electron transport layer material has a higher LUMO energy level than the blue fluorescent dopant material,
• wherein a difference in LUMO energy level between the electron transport layer material and the blue fluorescent dopant material is 0.1 eV or less, and
• wherein the hole transport layer material, the electron transport layer material, and the blue host material have the following triplet energy relationships:
• T1,BH<T1,HTL and T1,BH<T1,ETL, 2.8<T1,HTL<3.0, and 2.6<T1,ETL<2.8, where T1,HTL, T1,ETL and T1,BH indicate triplet energies of the hole transport layer material, the electron transport layer material, and the blue host material, respectively.