Method of manufacturing an organic light-emitting device and an organic light-emitting device manufactured by using the same

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

• forming a first electrode;
• forming a hole transport layer on the first electrode;
• forming an emission layer on the hole transport layer;
• and
• forming a second electrode on the emission layer,
• wherein the forming of the hole transport layer comprises:
• coating a composition for forming the hole transport layer on the first electrode, the composition for forming the hole transport layer including a hole transport material and a first solvent, and
• heat-treating the composition for forming the hole transport layer at a temperature of about 185° C. to about 210° C. to remove the first solvent therefrom,
• wherein the forming of the emission layer comprises:
• coating a composition for forming the emission layer on the hole transport layer, the composition for forming the emission layer including a light-emitting material and a second solvent, and
• drying the composition for forming the emission layer to remove the second solvent therefrom, and
• wherein the organic light-emitting device comprises a mixed layer, in which the hole transport material and the light-emitting material are mixed together, between the hole transport layer and the emission layer.