Light-emitting device and light-emitting display device including the same

A light-emitting device comprising:

• a first electrode and a second electrode facing each other over a substrate;
• and
• a first blue stack, a first charge generation layer, a phosphorescent stack and a second blue stack between the first electrode and the second electrode,
• wherein,
• the first blue stack sequentially comprises a first hole transport layer including an arylene-based material, a first blue light-emitting unit, and a first electron transport layer,
• the second blue stack sequentially comprises a second hole transport layer, a second blue light-emitting unit, and a second electron transport layer,
• at least one of the first and second blue light-emitting units comprises first and second blue light-emitting layers, and the first and second blue light-emitting layers comprise a same host and comprise different first and second blue dopants, respectively,
• the first blue light-emitting layer and the second blue light-emitting layer are in contact with each other and include an asymmetric hole trap region biased toward the first blue light-emitting layer, and
• the first blue dopant has a higher highest occupied molecular orbital (HOMO) energy level than a HOMO energy level of the first hole transport layer or the second hole transport layer.

A light-emitting device comprising:

• a first electrode and a second electrode facing each other on a substrate;
• and
• a first blue stack, a first charge generation layer, and a phosphorescent stack between the first electrode and the second electrode,
• wherein,
• the first blue stack sequentially comprises a hole transport layer including an arylene-based material, a first blue light-emitting layer, a second blue light-emitting layer, and an electron transport layer,
• a main emission of a blue light is emitted from a region including an interface between the first blue light-emitting layer and the second blue light-emitting layer,
• an auxiliary emission of the blue light is emitted from a region in the first blue light-emitting layer, and
• the first blue light-emitting layer and the second blue light-emitting layer are in contact with each other and include an asymmetric hole trap region biased toward the first blue light-emitting layer.