KR-20260065668-A - LIGHT EMITTING DEVICE, ELECTRONIC DEVICE INCLUDING THE SAME AND MANUFACTURING METHOD OF THE LIGHT EMITTING DEVICE

Abstract

A light-emitting element according to one embodiment of the present invention comprises a first electrode, a functional layer disposed on the first electrode and including at least a light-emitting layer, a second electrode disposed on the functional layer, and a capping layer disposed on the second electrode, wherein the second electrode comprises a first layer disposed on the functional layer, a second layer disposed on the first layer and including a material different from the first layer, and a third layer disposed on the second layer and including a material different from the second layer, wherein the second layer comprises a plurality of sublayers each comprising silver (Ag), and the plurality of sublayers comprises a first sublayer disposed on the first layer, a second sublayer disposed on the first sublayer, and a third sublayer disposed on the second sublayer, wherein the film density of the first sublayer and the film density of the second sublayer are different, and the film density of the second sublayer and the film density of the third sublayer are different.

Inventors

• 김휘
• 손지희
• 이슬기
• 이준구

Assignees

• 삼성디스플레이 주식회사

Dates

Publication Date

20260511

Application Date

20241101

Claims (20)

1. First electrode; A functional layer disposed on the first electrode and comprising at least a light-emitting layer; A second electrode disposed on the functional layer above; and A capping layer disposed on the second electrode; comprising, The second electrode comprises a first layer disposed on the functional layer, a second layer disposed on the first layer and comprising a material different from the first layer, and a third layer disposed on the second layer and comprising a material different from the second layer. The second layer comprises a plurality of sublayers, each containing silver (Ag), and The above plurality of sublayers A first sublayer disposed on the first layer above; A second sublayer disposed on the first sublayer; and A third sublayer disposed on the second sublayer; comprising, A light-emitting device in which the film density of the first sublayer and the film density of the second sublayer are different, and the film density of the second sublayer and the film density of the third sublayer are different.
2. In paragraph 1, The film density of the second sublayer is lower than the film density of each of the first sublayer and the third sublayer, and A light-emitting device in which the film density of the first sublayer and the film density of the third sublayer are substantially the same.
3. In paragraph 1, The film density of the second sublayer is higher than the film density of each of the first sublayer and the third sublayer, and A light-emitting device in which the film density of the first sublayer and the film density of the third sublayer are substantially the same.
4. In paragraph 1, The above plurality of sublayers A fourth sublayer disposed on the third sublayer; and A fifth sublayer disposed on the fourth sublayer; further comprising, A light-emitting device in which the film density of the third sublayer and the film density of the fourth sublayer are different, and the film density of the fourth sublayer and the film density of the fifth sublayer are different.
5. In paragraph 1, The second sublayer is placed directly on the first sublayer, and The third sublayer is a light-emitting element directly disposed on the second sublayer.
6. In paragraph 1, The light-emitting element having the first sublayer, the second sublayer, and the third sublayer together.
7. In paragraph 1, The first layer is directly disposed on the functional layer, and The second layer is placed directly on the first layer, and The above third layer is a light-emitting element directly disposed on the above second layer.
8. In paragraph 1, The above functional layer A hole transport region disposed on the first electrode; The light-emitting layer disposed on the hole transport region above; and Includes an electron transport region disposed on the light-emitting layer; and The first layer is disposed directly on the electron transport region, and The above capping layer is a light-emitting element directly disposed on the third layer.
9. In paragraph 1, The above second electrode is a light-emitting element that is a cathode.
10. In paragraph 1, The first electrode comprises at least one metal selected from Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, W, In, Sn, and Zn, at least two compounds selected from the metals, and at least one of ITO (indium tin oxide), IZO (indium zinc oxide), ZnO (zinc oxide), and ITZO (indium tin zinc oxide).
11. In paragraph 1, The thickness of the first sublayer is 20 Å or more and 30 Å or less, and The thickness of the second sublayer is 50 Å or more and 70 Å or less, and A light-emitting device having a thickness of the third sublayer of 20 Å or more and 30 Å or less.
12. In paragraph 1, The thickness of the first layer is 5 Å or more and 30 Å or less, and The thickness of the second layer is 90 Å or more and 300 Å or less, and A light-emitting device having a thickness of 5 Å or more and 30 Å or less of the third layer.
13. In paragraph 1, A light-emitting device comprising, wherein each of the first layer and the third layer comprises a metal halide, a lanthanide metal, or a co-deposited material of a metal halide and a lanthanide metal.
14. In paragraph 1, A light-emitting element in which each of the first sublayer, the second sublayer, and the third sublayer is composed of silver (Ag).
15. Base layer; A circuit layer disposed on the above base layer; and It includes a display element layer disposed on the circuit layer and comprising at least one light-emitting element, and The above light-emitting element First electrode; A functional layer disposed on the first electrode and comprising at least a light-emitting layer; and A second electrode disposed on the functional layer; comprising, The second electrode comprises a first layer disposed on the functional layer, a second layer disposed on the first layer and comprising a material different from the first layer, and a third layer disposed on the second layer and comprising a material different from the second layer. The second layer comprises a plurality of sublayers, each containing silver (Ag), and The above plurality of sublayers A first sublayer disposed on the first layer above; A second sublayer disposed on the first sublayer; and A third sublayer disposed on the second sublayer; comprising, The film density of the second sublayer is lower than the film density of each of the first sublayer and the third sublayer, and An electronic device in which the film density of the first sublayer and the film density of the third sublayer are substantially the same.
16. A step of forming a functional layer including at least a light-emitting layer on a first electrode; A step of forming a second electrode on the functional layer; and The step of forming a capping layer on the second electrode; comprising The step of forming the second electrode above A step of forming a first layer on the above functional layer; A step of forming a second layer on the first layer using a material different from the first layer; and The method comprises the step of forming a third layer on the second layer using a material different from the second layer; and The step of forming the second layer above A step of forming a first sublayer by depositing silver (Ag) on the first layer at a first deposition rate; A step of forming a second sublayer by depositing silver on the first sublayer at a second deposition rate; and The step of forming a third sublayer by depositing silver on the second sublayer at a third deposition rate; A method for manufacturing a light-emitting device in which the first deposition rate and the second deposition rate are different, and the second deposition rate and the third deposition rate are different.
17. In Paragraph 16, A method for manufacturing a light-emitting device in which each of the steps of forming the first sublayer, forming the second sublayer, and forming the third sublayer comprises a thermal deposition process.
18. In Paragraph 16, The second deposition rate is slower than the first deposition rate and the third deposition rate, and A method for manufacturing a light-emitting device in which the first deposition rate and the third deposition rate are substantially the same.
19. In Paragraph 16, The step of forming the second layer above A step of forming a fourth sublayer by depositing silver on the third sublayer at a fourth deposition rate; and The step of forming a fifth sublayer by depositing silver on the fourth sublayer at a fifth deposition rate; further comprising A method for manufacturing a light-emitting device in which the third deposition rate and the fourth deposition rate are different, and the fourth deposition rate and the fifth deposition rate are different.
20. In Paragraph 16, In the step of forming the second electrode, The first layer is formed directly on the functional layer, and The second layer is formed directly on the first layer, and A method for manufacturing a light-emitting device in which the third layer is formed directly on the second layer.

Description

Light-emitting device, electronic device including the same, and method of manufacturing the light-emitting device The present invention relates to a light-emitting element, an electronic device including the same, and a method for manufacturing a light-emitting element. Recently, there has been active development of organic electroluminescence displays as image display devices. Unlike liquid crystal displays, organic electroluminescence displays are so-called self-emissive display devices that realize a display by causing a light-emitting material containing an organic compound in the light-emitting layer to emit light by recombining holes and electrons injected from a first electrode and a second electrode in the light-emitting layer. In applying light-emitting devices to display devices, there is a demand for high luminous efficiency and long lifespan of the light-emitting devices, and there is a continuous need for the development of materials and structures for light-emitting devices that can stably realize these requirements. FIG. 1 is a perspective view of an electronic device according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of an electronic device according to one embodiment of the present invention. FIG. 3 is a plan view of a display panel according to one embodiment of the present invention. FIG. 4 is an enlarged plan view of a part of a display panel according to one embodiment of the present invention. FIG. 5 is a cross-sectional view of an electronic device according to one embodiment of the present invention. FIG. 6 is a cross-sectional view of an electronic device of one embodiment of the present invention. FIGS. 7 to 9 are each cross-sectional views schematically illustrating a light-emitting element according to one embodiment. FIGS. 10a to 10c are each cross-sectional views of a second electrode according to one embodiment. FIGS. 11 to 14 are each cross-sectional views of an electronic device according to one embodiment. FIGS. 15a to 15d are cross-sectional views of some steps of a method for manufacturing a light-emitting element according to one embodiment. FIGS. 16a to 16c are cross-sectional views of some steps of a method for manufacturing a light-emitting element according to one embodiment. The present invention is capable of various modifications and may take various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the invention to the specific disclosed forms, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. In describing each drawing, similar reference numerals have been used for similar components. In the attached drawings, the dimensions of the structures are depicted enlarged from their actual size for clarity of the invention. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the invention, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. In this application, when a part such as a layer, film, region, or plate is described as being "on" or "upper" to another part, this includes not only cases where it is "immediately above" the other part, but also cases where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is described as being "under" or "lower" to another part, this includes not only cases where it is "immediately below" the other part, but also cases where there is another part in between. Furthermore, in this application, being "placed on" may include cases where it is placed not only on the upper part but also on the lower part. Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an electronic device (DD) according to an embodiment of the present invention. As shown in FIG. 1, the electronic device (DD) can display an image through a display surface (DD-IS). The display surface (DD-IS) may have a rectangular shape having long sides extending in a first direction (DR1) on a plane and short sides extending in a second direction (DR2