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CN-116261922-B - Organic light emitting device

CN116261922BCN 116261922 BCN116261922 BCN 116261922BCN-116261922-B

Abstract

The invention provides an organic light-emitting device, comprising an anode, a cathode arranged opposite to the anode, and a light-emitting layer arranged between the anode and the cathode, wherein the light-emitting layer contains 2 main compounds, so that the efficiency, the driving voltage and the service life characteristic of the organic light-emitting device can be improved.

Inventors

  • JIN YONGXI
  • LI DONGXUN
  • JIN MINJUN
  • XU SHANGDE
  • JIN DONGXI
  • WU ZHONGXI

Assignees

  • 株式会社LG化学

Dates

Publication Date
20260505
Application Date
20211020
Priority Date
20201020

Claims (14)

  1. 1. An organic light emitting device comprising: An anode; A cathode disposed opposite to the anode, and A light emitting layer disposed between the anode and the cathode, Wherein the light emitting layer includes a first compound represented by the following chemical formula 1 and a second compound represented by the following chemical formula 2: Chemical formula 1 , In the chemical formula 1 described above, a compound having the formula, A 1 and A 2 are each independently a benzene or naphthalene ring fused to an adjacent five-membered ring, L is a substituted or unsubstituted dibenzofuranylene group, or a substituted or unsubstituted benzonaphthofuranylene group, L 1 and L 2 are each independently a single bond, or a substituted or unsubstituted C 6-60 arylene group, Ar 1 and Ar 2 are each independently a substituted or unsubstituted C 6-60 aryl group, or a substituted or unsubstituted C 2-60 heteroaryl group containing more than 1 heteroatom in N, O and S, R 1 and R 2 are each independently hydrogen, deuterium, or a substituted or unsubstituted C 6-60 aryl, When each of A 1 and A 2 is a benzene ring, a and b are each independently an integer of 0 to 4, When each of A 1 and A 2 is a naphthalene ring, each of a and b is independently an integer of 0 to 6, Chemical formula 2 , In the chemical formula 2 described above, the chemical formula, L' is a substituted or unsubstituted C 6-60 arylene group, L 3 is a single bond, or a substituted or unsubstituted C 6-60 arylene group, L 4 is a single bond, and the total number of the components is a single bond, Ar 3 is C 6-20 aryl which is unsubstituted or substituted by 1 or more substituents selected from deuterium, C 1-10 alkyl and C 6-20 aryl, or C 2-20 heteroaryl which is unsubstituted or substituted by 1 or more substituents selected from deuterium and C 1-10 alkyl and which contains 1 heteroatom selected from O and S, and Ar 4 is C 6-20 aryl which is unsubstituted or substituted by 1 or more substituents selected from deuterium, C 1-10 alkyl and C 6-20 aryl, or C 2-20 heteroaryl which is unsubstituted or substituted by 1 or more substituents selected from deuterium, C 1-10 alkyl and C 6-20 aryl and contains a heteroatom N, R 3 is hydrogen or deuterium, and the hydrogen or deuterium, C is an integer of 0 to 9, A. b and c are each 2 or more, the substituents in parentheses are the same or different from each other.
  2. 2. The organic light-emitting device according to claim 1, wherein the first compound is represented by any one of the following chemical formulas 1-1 to 1-10: , , in the chemical formulas 1-1 to 1-10, A 'and b' are each independently integers from 0 to 4, A "and b" are each independently integers from 0 to 6, L, L 1 、L 2 、Ar 1 、Ar 2 、R 1 and R 2 are as defined in claim 1.
  3. 3. The organic light-emitting device of claim 1, wherein L is any one selected from the group consisting of: 。
  4. 4. The organic light-emitting device of claim 1, wherein L 1 and L 2 are single bonds.
  5. 5. An organic light emitting device according to claim 1 wherein Ar 1 and Ar 2 are each independently phenyl, biphenyl, naphthyl or dibenzofuranyl.
  6. 6. An organic light-emitting device according to claim 1 wherein R 1 and R 2 are each independently phenyl, biphenyl or naphthyl.
  7. 7. The organic light-emitting device of claim 1, wherein a+b is 0 or 1.
  8. 8. The organic light-emitting device according to claim 1, wherein the first compound is any one selected from the group consisting of: , , , , , , , , , , , , , , , , 。
  9. 9. the organic light-emitting device according to claim 1, wherein L' is phenylene, biphenyldiyl or naphthylene.
  10. 10. The organic light-emitting device of claim 9, wherein L' is any one selected from the group consisting of: 。
  11. 11. the organic light-emitting device according to claim 1, wherein L 3 is a single bond, phenylene, biphenyldiyl or naphthylene.
  12. 12. The organic light-emitting device according to claim 1, wherein Ar 3 is phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, triphenylene, dibenzofuranyl, dibenzothienyl or benzonaphthofuranyl, Ar 4 is phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, triphenylene or carbazolyl, Ar 4 is unsubstituted or substituted with phenyl or naphthyl.
  13. 13. The organic light-emitting device of claim 1, wherein R 3 is hydrogen.
  14. 14. The organic light-emitting device according to claim 1, wherein the second compound is any one selected from the group consisting of: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 。

Description

Organic light emitting device Technical Field Cross reference to related applications The present application claims priority based on korean patent application No. 10-2020-0136882 at 10 months and korean patent application No. 10-2021-01393 at 19 at 2021, the entire contents of the disclosures of the korean patent application are incorporated as part of the present specification. The present invention relates to an organic light emitting device. Background In general, the organic light emitting phenomenon refers to a phenomenon of converting electric energy into light energy using an organic substance. An organic light emitting device using an organic light emitting phenomenon has a wide viewing angle, excellent contrast, fast response time, and excellent brightness, driving voltage, and response speed characteristics, and thus a great deal of research is being conducted. The organic light emitting device generally has a structure including an anode and a cathode and an organic layer between the anode and the cathode. In order to improve efficiency and stability of the organic light-emitting device, the organic layer is often formed of a multilayer structure formed of different materials, and may be formed of a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, or the like. In such a structure of an organic light emitting device, if a voltage is applied between both electrodes, holes are injected into the organic layer from the anode and electrons are injected into the organic layer from the cathode, and when the injected holes and electrons meet, excitons (exciton) are formed, and light is emitted when the excitons re-transition to the ground state. As for the organic matter used for the organic light emitting device as described above, development of new materials is continuously demanded. Prior art literature Patent literature (Patent document 0001) Korean patent laid-open No. 10-2000-0051826 Disclosure of Invention Technical problem The present invention relates to an organic light emitting device. Solution to the problem The present invention provides the following organic light emitting device. An organic light emitting device comprising: An anode; a cathode disposed opposite to the anode, and A light-emitting layer disposed between the anode and the cathode, Wherein the light emitting layer includes a first compound represented by the following chemical formula 1 and a second compound represented by the following chemical formula 2: [ chemical formula 1] In the above-mentioned chemical formula 1, A 1 and A 2 are each independently a benzene or naphthalene ring fused to an adjacent five-membered ring, L is a substituted or unsubstituted dibenzofuranylene group, or a substituted or unsubstituted benzonaphthofuranylene group, L 1 and L 2 are each independently a single bond, or a substituted or unsubstituted C 6-60 arylene group, Ar 1 and Ar 2 are each independently a substituted or unsubstituted C 6-60 aryl group, or a substituted or unsubstituted C 2-60 heteroaryl group containing more than 1 heteroatom in N, O and S, R 1 and R 2 are each independently hydrogen, deuterium, or a substituted or unsubstituted C 6-60 aryl, When each of the above-mentioned A 1 and A 2 is a benzene ring, each of a and b is independently an integer of 0 to 4, When A 1 and A 2 are each a naphthalene ring, a and b are each independently an integer of 0 to 6, [ Chemical formula 2] In the above-mentioned chemical formula 2, L' is a substituted or unsubstituted C 6-60 arylene group, L 3 and L 4 are each independently a single bond, or a substituted or unsubstituted C 6-60 arylene group, Ar 3 and Ar 4 are each independently a substituted or unsubstituted C 6-60 aryl group, or a substituted or unsubstituted C 2-60 heteroaryl group containing more than 1 heteroatom in N, O and S, R 3 is hydrogen or deuterium, and the hydrogen or deuterium, C is an integer from 0 to 9. In this case, when a, b and c are each 2 or more, the substituents in parentheses are the same or different from each other. Effects of the invention The organic light emitting device described above contains 2 host compounds in the light emitting layer, and efficiency, driving voltage, and/or lifetime characteristics can be improved in the organic light emitting device. Drawings Fig. 1 illustrates an example of an organic light-emitting device constituted by a substrate 1, an anode 2, a light-emitting layer 3, and a cathode 4. Fig. 2 illustrates an example of an organic light-emitting device constituted by a substrate 1, an anode 2, a hole injection layer 5, a hole transport layer 6, an electron suppression layer 7, a light-emitting layer 3, a hole blocking layer 8, an electron injection and transport layer 9, and a cathode 4. Detailed Description In the following, the invention will be described in more detail in order to aid understanding thereof. In the present description of the inventio