KR-102962400-B1 - ORGANIC LIGHT-EMITTING ELEMENT AND DISPLAY APPARATUS, IMAGING APPARATUS, ELECTRONIC DEVICE, ILLUMINATION APPARATUS, MOVING OBJECT, AND EXPOSURE LIGHT SOURCE INCLUDING THE SAME

Abstract

The present disclosure provides an organic device comprising an anode, a first layer, a functional layer in contact with the first layer, and a cathode in this order. The energy levels of the first host material and the first dopant material constituting the first layer and the organic material constituting the functional layer satisfy a specific relationship.

Inventors

• 타카야 이타루
• 야마다 나오키
• 니시데 요스케
• 미야시타 히로카즈

Assignees

• 캐논 가부시끼가이샤

Dates

Publication Date

20260511

Application Date

20230130

Priority Date

20220207

Claims (17)

1. anode; First light-emitting layer; A functional layer in contact with the first light-emitting layer; and The negative electrode, As an organic light-emitting device comprising in this order, The first light-emitting layer above contains a first host material and a first dopant material, and The above functional layer is composed of an organic material consisting solely of hydrocarbons, and An organic light-emitting device satisfying the following formulas [1] to [3] when the first host material has an LUMO energy level LUMO h1 , the first dopant material has an LUMO energy level LUMO d1 , the first host material has an HOMO energy level HOMO h1 , the first dopant material has an HOMO energy level HOMO d1, and the organic material has an HOMO energy level HOMO FL : ＬＵＭＯ h1 >ＬＵＭＯ d1 [1] ＨＯＭＯ h1 >ＨＯＭＯ d1 [2] ＨＯＭＯ FL >ＨＯＭＯ h1 [3].
2. In Article 1, Organic light-emitting device satisfying the following formula [4]: |ＬＵＭＯ h1 -ＬＵＭＯ d1 |>|ＨＯＭＯ h1 -ＨＯＭＯ d1 | [4].
3. In Article 1, An organic light-emitting device satisfying the following formula [3-1]: ＨＯＭＯ FL -ＨＯＭＯ h1 ≥ 0.05 [ｅＶ] [3-1].
4. In Article 1, An organic light-emitting device satisfying the following formula [3-2]: ＨＯＭＯ FL -ＨＯＭＯ h1 ≥ 0.15 [ｅＶ] [3-2].
5. In Article 1, On the positive side of the first light-emitting layer, a second light-emitting layer is further included in contact with the first light-emitting layer. The second light-emitting layer contains a second host material and a second dopant material, and An organic light-emitting device satisfying the following equation [5] when the second dopant material has an HOMO energy level HOMO d2 and the second host material has an HOMO energy level HOMO h2 : ＨＯＭＯ d2 >ＨＯＭＯ h2 [5].
6. In Article 5, Organic light-emitting device satisfying the following formula [5-1]: ＨＯＭＯ d2 -ＨＯＭＯ h2 > 0.4 [ｅＶ] [5-1].
7. In Article 5, An organic light-emitting device in which the first host material and the second host material are identical.
8. In Article 5, The above second light-emitting layer contains a third dopant material, and The above first dopant material is a blue light-emitting dopant material, and The above second dopant material is a red light-emitting dopant material, and The above third dopant material is a green light-emitting dopant material, and An organic light-emitting device that satisfies the following equation [6] when the above third dopant material has an HOMO energy level HOMO d3 : ＨＯＭＯ d3 >ＨＯＭＯ h2 [6].
9. In Article 1, An organic light-emitting device formed of an organic material and further comprising an electron transport layer disposed on the negative side of the functional layer while in contact with the functional layer.
10. In Article 9, An organic light-emitting device, wherein the electron transport layer is composed of an organic material having an oxadiazole derivative, an oxazole derivative, a pyrazine derivative, a triazole derivative, a triazine derivative, a quinoline derivative, a quinoxaline derivative, or a phenanthroline derivative.
11. In Article 1, It further comprises an electron transport layer formed of an organic material and disposed on the negative side of the functional layer while in contact with the functional layer, and An organic light-emitting device satisfying the following equation [7] when the organic material constituting the functional layer has an HOMO energy level HOMO FL and the organic material constituting the electron transport layer has an HOMO energy level HOMO ETL : ＨＯＭＯ FL >ＨＯＭＯ ETL [7].
12. A display device comprising a plurality of pixels, A display device comprising at least one of the pixels, the organic light-emitting element according to any one of claims 1 to 11 and an active element connected to the organic light-emitting element.
13. An optical unit having a plurality of lenses; An imaging element that receives light passing through the optical unit; and As an imaging device including a display unit, An imaging device comprising a display portion that displays information acquired by the imaging element and a display device according to claim 12.
14. Housing; A communication unit that communicates with an external device; and As an electronic device including a display unit, The above-described display portion is an electronic device having the above-described display device according to claim 12.
15. light source; and A lighting device comprising a light diffusion section or an optical filter, The light source is a lighting device comprising the organic light-emitting element according to any one of claims 1 to 11.
16. Gas; and A mobile body comprising a light tool disposed on the above-mentioned body, The above-mentioned light-emitting device is a movable body having the organic light-emitting element according to any one of claims 1 to 11.
17. As an exposure light source for an electronic photolithographic image forming device, An exposure light source comprising the organic light-emitting element according to any one of claims 1 to 11.

Description

Organic light-emitting element and display apparatus, imaging apparatus, electronic device, illumination apparatus, moving object, and exposure light source including the same The aspects of the embodiments relate to an organic light-emitting element, which is one of the light-emitting elements, and to devices and apparatuses equipped with said element. Recently, research and development of full-color light-emitting arrays equipped with organic light-emitting devices (hereinafter referred to as "organic electroluminescent devices" or "organic EL devices") has been progressing vigorously. In organic light-emitting devices, a hole transport layer, an emissive layer, an electron transport layer, and a cathode are generally formed in sequence on the anode. Furthermore, a hole blocking layer may be installed on the emissive layer side of the electron transport layer, and an electron injection layer may be installed on the cathode side of the electron transport layer. Additionally, when fabricating a full-color light-emitting array, different emissive layers may be arranged individually for each pixel (device), or a white organic light-emitting device may be used that is equipped with a white emissive layer and has red, green, and blue color filters installed individually for each pixel. Regarding the above white organic light-emitting device, three light-emitting materials corresponding to the color filters—red, green, and blue—are often used. Japanese Patent Publication No. 2014-22205 (hereinafter referred to as PTL 1) discloses a white organic light-emitting device in which a two-color light-emitting layer containing a red light-emitting material and a green light-emitting material in one light-emitting layer and an electron-trapping blue light-emitting layer are stacked adjacently, and the host materials of the two light-emitting layers are the same to lower the driving voltage of the white EL device. The white organic light-emitting device disclosed in PTL 1 has excellent light emission balance, but because it is equipped with a hole block layer in contact with an electron-trapping blue light-emitting layer, there may be a problem that the driving voltage of the device increases. In addition, when current is applied, hole accumulation is likely to occur at the interface between the electron-trapping blue light-emitting layer and the hole block layer, which is a problem that the durability degradation of the device is likely to progress. An organic light-emitting device comprising, in this order: an anode; a first light-emitting layer; a functional layer in contact with the first light-emitting layer; and a cathode. The first light-emitting layer comprises a first host material and a first dopant material, wherein the first host material has an LUMO energy level LUMO h1 , the first dopant material has an LUMO energy level LUMO d1 , the first host material has an HOMO energy level HOMO h1 , the first dopant material has an HOMO energy level HOMO d1 , and the organic material constituting the functional layer has an HOMO energy level HOMO FL , the following formulas [1] to [3] Satisfies: ＬＵＭＯ h1 >ＬＵＭＯ d1 [1] ＨＯＭＯ h1 >ＨＯＭＯ d1 [2] ＨＯＭＯ FL >ＨＯＭＯ h1 [3]. Further features of the present disclosure will become apparent from the description of the following exemplary embodiments with reference to the accompanying drawings. FIG. 1a is a schematic cross-sectional view in the thickness direction of an organic light-emitting device according to one embodiment of the present disclosure. FIG. 1b is a schematic energy diagram illustrating the energy levels of a first light-emitting layer and adjacent layers. FIG. 2a is a schematic cross-sectional view in the thickness direction of an organic light-emitting device according to another embodiment of the present disclosure. FIG. 2b is a schematic energy diagram illustrating the energy levels of a first light-emitting layer, a second light-emitting layer, and an adjacent layer. FIG. 3a is a schematic diagram of an image forming device according to one embodiment of the present disclosure. FIG. 3b and FIG. 3c are schematic diagrams illustrating, respectively, a configuration in which a plurality of light-emitting portions of an exposure light source are arranged on a long substrate. FIG. 4a is a schematic cross-sectional view illustrating an example of a pixel of a display device according to one embodiment of the present disclosure. FIG. 4b is a schematic cross-sectional view of an example of a display device having an organic light-emitting element according to one embodiment of the present disclosure. FIG. 5 is a schematic diagram illustrating an example of a display device according to one embodiment of the present disclosure. FIG. 6a is a schematic diagram illustrating an example of a display device according to one embodiment of the present disclosure. FIG. 6b is a schematic diagram illustrating an example of a foldable display device. FIG. 7a is a schematic diagram illustr