Organic light-emitting device
AssigneeLG Display Co., Ltd.
InventorKwanghyun Kim
Life of this patent
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Abstract
An organic light-emitting device includes a red emission layer formed by mixing a first host made of a carbazole-based material, a second host made of a metal complex and a dopant. Accordingly, the driving voltage of the organic light-emitting device can be reduced, and thus power consumption of the organic light-emitting device can be improved. In addition, by mixing the first host and the second host having differences in energy level in the red emission layer, the luminous efficiency of the red emission layer of the organic light-emitting device can be improved. Thus, the lifetime of the organic light-emitting device can be elongated.
Claims16
An organic light-emitting device, comprising:
- a first electrode and a second electrode;
- and
- an emission layer disposed between the first electrode and the second electrode over a plurality of sub-pixel regions, the emission layer comprising a red emission layer, a green emission layer and a blue emission layer,
- wherein the red emission layer comprises a first host, a second host and a dopant, wherein the first host is made of a carbazole-based material, and the second host is made of a beryllium-based complex or an aluminum-based complex.
An organic layered structure, comprising:
- a red emission layer comprising a first host having a lowest unoccupied molecular orbital (LUMO) energy level and a highest unoccupied molecular orbital (HOMO) energy level and a second host having a LUMO energy level and a HOMO energy level that are different from those of the first host, resulting in an area for recombination of electrons and holes being formed within the red emission layer;
- a green emission layer;
- and
- a blue emission layer,
- wherein the area for recombination being expanded compared to a related art red emission layer having only a single host resulting in an area for recombination being formed only at an interface between a hole transporting layer and the red emission layer, and
- the red emission layer, the green emission layer and the blue emission layer are not overlapped with each other, and
- the first host is a carbazole-based material and the second host is a metal complex.
Dependencies are inferred from the claim text.