Organic light emitting device and manufacturing method thereof

The invention relates to an organic light emitting device, which comprises a substrate, and a light emitting device formed on the substrate, wherein the light emitting device is composed of a first electrode layer, a light emitting layer and a second electrode layer; the light emitting layer comprises a main body material and a dye; the main body material is formed by materials with a hole transport ability; the triplet energy level T1 of at least one material in the main body material is higher than a triplet energy level S1, and T1-S1 /=1eV, and the difference between the doublet and triplet energy level and the singlet energy level is -0.1 to 0.1 eV. The device structure can make full use the triplet energy in the main body material and the dye, and while the light emitting efficiency is improved, the service life of the device is enhanced.