Organic light emitting device and method for manufacturing the same

1. A method for manufacturing an organic light emitting device, the method comprising:

forming a first electrode disposed on a substrate;

forming a hole function layer on the first electrode;

forming a first emission layer on and in direct contact with the hole function layer;

performing a heat treatment process to melt surfaces of the hole function layer and the first emission layer;

forming a second emission layer on the first emission layer;

forming an electron function layer on the second emission layer, the second emission layer being in direct contact with the first emission layer and the electron function layer; and

forming a second electrode on the electron function layer,

wherein the first emission layer includes a host alone and the second emission layer includes a dopant and a host, the melting process is performed before the formation of the second emission layer comprising the dopant, and

wherein the first emission layer is thinner than the second emission layer and has a thickness at 1 to 20% of the second emission layer.

2. The method of claim 1 , wherein the melting of the hole function layer and the first emission layer is performed at a temperature of 100 to 250° C.

3. The method of claim 1 , wherein the first emission layer is formed at a thickness of 5 to 100 nm.

4. The method of claim 1 , wherein the heat treatment process is performed for 20 minutes at 100° C. under N 2 atmosphere pressure.