Electroluminescent device and electroluminescent display device including the same

An electroluminescent display device comprising:

• a substrate;
• an electroluminescent device located on the substrate, the device comprising:
• an anode and a cathode facing each other,
• a light compensation layer located between the anode and the cathode, the light compensation layer having a first refractive index,
• an emitting material layer located between the light compensation layer and the cathode, the emitting material layer having a second refractive index higher than the first refractive index, and
• a hole injection layer located between the emitting material layer and the light compensation layer or between the light compensation layer and the anode;
• and
• a thin-film transistor located between the substrate and the electroluminescent device, and connected to the electroluminescent device,
• wherein the hole injection layer has a third refractive index higher than the first refractive index, and
• wherein the light compensation layer has a thickness smaller than a thickness of the emitting material layer and a thickness of the hole injection layer.

An electroluminescent device comprising:

• an anode and a cathode facing each other, the anode comprising:
• a first transparent electrode layer,
• a second transparent layer facing the first transparent electrode layer, and
• a reflective electrode layer located between the first and second transparent electrode layers;
• a light compensation layer located between the anode and the cathode, the light compensation layer having a first refractive index;
• and
• an emitting material layer located between the light compensation layer and the cathode, the emitting material layer having a second refractive index higher than the first refractive index,
• wherein a hole injection layer has a third refractive index higher than the first refractive index.