Light emitting unit of electroluminescence device and manufacturing method thereof

A light emitting unit of an electroluminescence device, the light emitting unit comprising:

• a first electrode layer;
• a second electrode layer having a top portion and a bottom portion;
• and
• a light emitting layer located between the first electrode layer and the second electrode layer, wherein a distance between the top portion and the light emitting layer is smaller than a distance between the bottom portion and the light emitting layer, and an oxygen concentration of the top portion is higher than an oxygen concentration of the bottom portion.

A manufacturing method of a light emitting unit of an electroluminescence device, the method comprising:

• forming a power line on a substrate;
• forming a first electrode layer on the substrate, the first electrode layer being electrically connected to the power line, wherein a method of forming the first electrode layer comprises performing a deposition process including passing oxygen, and a concentration of oxygen passed in increases with a duration of the deposition process;
• forming a light emitting layer on the first electrode layer;
• and
• forming a second electrode layer on the light emitting layer.