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US 2021/0202844 A1Published application
Organic light-emitting device and apparatus including the same
AssigneeSamsung Display Co., Ltd.
InventorsJaeweon HUR, Kyungsik KIM, Sungwook KIM, Seulong KIM, Seungjin CHU, Hyein JEONG
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Abstract
An organic light-emitting device in which a hole transport region includes a first hole transport stack, a second hole transport stack between the first hole transport stack and an emission layer, and an electron blocking layer between the second hole transport stack and the emission layer, wherein a HOMO energy level of the hole transport region satisfies a certain equations. The organic light-emitting devices according to embodiments of the present disclosure may have high efficiency and a long lifespan.
Claims20
An organic light-emitting device comprising:
- a first electrode;
- a second electrode facing the first electrode;
- and
- an organic layer between the first electrode and the second electrode, the organic layer comprising an emission layer and a hole transport region between the first electrode and the emission layer,
- wherein the hole transport region comprises a first hole transport stack, a second hole transport stack between the first hole transport stack and the emission layer, and an electron blocking layer between the second hole transport stack and the emission layer,
- the first hole transport stack comprises a first hole injection layer and a first hole transport layer,
- the second hole transport stack comprises a second hole injection layer and a second hole transport layer,
- the first hole injection layer is between the first electrode and the first hole transport layer,
- the second hole injection layer is between the first hole transport layer and the second hole transport layer,
- the first hole injection layer comprises a first compound,
- the first hole transport layer comprises a second compound,
- the second hole injection layer comprises a third compound,
- the second hole transport layer comprises a fourth compound,
- the electron blocking layer comprises a fifth compound, and
- the organic light-emitting device satisfies Equations 1 to 4:
- HOMO(HTM1)≥HOMO(HTM2) Equation 1
- HOMO(HTM3)≥HOMO(HTM4) Equation 2
- HOMO(HTM1)−HOMO(HTM2)≤0.5 eV Equation 3
- HOMO(HTM3)−HOMO(HTM4)≤0.5 eV, Equation 4
- wherein in Equations 1 to 4, the HOMO(HTM1) is a lower energy level from among the HOMO energy level (eV) of the first compound and the HOMO energy level (eV) of the second compound,
- the HOMO(HTM2) is a higher energy level from among the HOMO energy level (eV) of the third compound and the HOMO energy level (eV) of the fourth compound,
- the HOMO(HTM3) is a lower energy level from among the HOMO energy level (eV) of the third compound and the HOMO energy level (eV) of the fourth compound,
- the HOMO(HTM4) is the HOMO energy level (eV) of the fifth compound.
20 more elements
Dependencies are inferred from the claim text.