JP-2026075884-A - Organic light-emitting device

Abstract

[Problem] To provide an organic light-emitting device with excellent light extraction efficiency. [Solution] The light-emitting device according to this embodiment has a first light-emitting element and a second light-emitting element adjacent to the first light-emitting element on the main surface of a substrate, the first light-emitting element and the second light-emitting element each have a first electrode, an organic compound layer and a second electrode, the first light-emitting element has a color filter on the second electrode that transmits first light, and the second light-emitting element has a first layer on the second electrode that transmits second light and has a refractive index lower than that of the color filter, and the color filter has an inverse tapered shape in a cross section perpendicular to the main surface. [Selection Diagram] Figure 1

Inventors

• 日當 翔馬
• 石津谷 幸司
• 伊藤 希之

Assignees

• キヤノン株式会社

Dates

Publication Date

20260511

Application Date

20241023

Claims (20)

1. The substrate has a first light-emitting element on its main surface and a second light-emitting element adjacent to the first light-emitting element. The first light-emitting element and the second light-emitting element each have a first electrode, a light-emitting layer, and a second electrode, respectively. The first light-emitting element has a color filter that transmits the first light on the second electrode, The second light-emitting element is a light-emitting device having a first layer on the second electrode that transmits second light and has a refractive index lower than that of the color filter, A light-emitting device characterized in that, in a cross-section perpendicular to the main surface, the color filter has an inverse tapered shape.
2. The light-emitting device according to claim 1, characterized in that the first layer is made of a transparent resin.
3. The light-emitting device according to claim 1, characterized in that the first layer is a color filter.
4. The light-emitting device according to claim 1, characterized in that the first layer consists of air.
5. In a cross-section perpendicular to the main surface, when the width of the color filter at the top surface is defined as the first width, the width of the color filter at the bottom surface is defined as the second width, and the width of the color filter between the top and bottom surfaces is defined as the third width, The light-emitting device according to claim 1, characterized in that the third width is longer than the first width and the second width.
6. In a cross-section perpendicular to the main surface, when the width of the color filter at the top surface is defined as the first width, the width of the color filter at the bottom surface is defined as the second width, and the width of the color filter between the top and bottom surfaces is defined as the third width, The light-emitting device according to claim 1, characterized in that the third width is shorter than the first width and the second width.
7. The light-emitting device according to claim 1, characterized in that when the refractive index of the color filter is n1 and the refractive index of the first layer is n2 , relation (a) is satisfied. (a) n 1 - n 2 >0.2
8. The first light-emitting element has a first light-emitting region, and the second light-emitting element has a second light-emitting region. The light-emitting device according to claim 1, wherein, in a cross section perpendicular to the main surface, the point in the inverse taper shape of the color filter that is closest to the second light-emitting element and furthest from the main surface is defined as the first point, the point on the second electrode that is closest to the second light-emitting region in the first light-emitting region is defined as the second point, the line passing through the first point and parallel to the main surface is defined as the first line, the line passing through the first point and perpendicular to the main surface is defined as the second line, the height from the interface between the light-emitting layer and the second electrode in the first light-emitting region to the first line is defined as V1 , the width from the second point to the second line is defined as H1 , the refractive index of the color filter is defined as n1 , and the refractive index of the first layer is defined as n2 , the device satisfies relationship (b). (b) n 2 /n 1 <V 1 /(H 1 2 +V 1 2 ) 1/2
9. The first light-emitting element has a first light-emitting region, and the second light-emitting element has a second light-emitting region. In a cross-section perpendicular to the main surface, the point in the inverse taper shape of the color filter that is closest to the second light-emitting element and furthest from the main surface is defined as the first point, the point in the inverse taper shape of the color filter that is closest to the main surface is defined as the third point, the point in the first light-emitting region that is furthest from the second light-emitting region and is on the second electrode is defined as the fourth point, the line passing through the first point and perpendicular to the main surface is defined as the second line, the line passing through the third point and perpendicular to the main surface is defined as the third line, the line passing through the third point and parallel to the main surface is defined as the fourth line, the height from the fourth point to the fourth line is defined as V2 , the width from the fourth point to the third line is defined as H2 , and the angle between the line connecting the first point and the third point and the second line is defined as θ. In a plan view of the main surface, the third point is located between the first and fourth points. The light-emitting device according to claim 1, characterized in that it satisfies relation (c). (c) θ<Arctan(H 2 /V 2 )
10. The light-emitting device according to claim 9, characterized in that it satisfies relation (d). (d) 2θ<Arctan(H 2 /V 2 )
11. The light-emitting device according to claim 1, characterized in that the light-emitting material in the light-emitting layer of the first light-emitting element and the light-emitting material in the light-emitting layer of the second light-emitting element are the same compound.
12. The light-emitting device according to claim 1, characterized in that the light-emitting material in the light-emitting layer of the first light-emitting element and the light-emitting material in the light-emitting layer of the second light-emitting element are different compounds.
13. The first light-emitting element and the second light-emitting element have a reflective layer between the substrate and the first electrode. The light-emitting device according to claim 1, characterized in that the distance between the reflective layer of the first light-emitting element and the first electrode is different from the distance between the reflective layer of the second light-emitting element and the first electrode.
14. The first light-emitting element and the second light-emitting element have a reflective layer between the substrate and the light-emitting layer. The light-emitting device according to claim 1, characterized in that the distance between the reflective layer and the light-emitting layer of the first light-emitting element is different from the distance between the reflective layer and the light-emitting layer of the second light-emitting element.
15. The light-emitting device according to claim 1, characterized in that the first light-emitting element and the second light-emitting element are organic light-emitting elements.
16. The light-emitting device further comprises a third light-emitting element, The third light-emitting element comprises the first electrode, the light-emitting layer, and the second electrode. The third light-emitting element and the first light-emitting element are adjacent to each other. The light-emitting device according to claim 1, characterized in that the third light-emitting element has a second layer on the second electrode that can transmit the third light and has a lower refractive index than the color filter.
17. The light-emitting device according to claim 16, characterized in that the third light-emitting element is an organic light-emitting element.
18. The light-emitting device according to claim 1, characterized in that the second light has an emission peak in the range of 490 nm to 550 nm.
19. A display device comprising: a display unit having a light-emitting device according to any one of claims 1 to 18; and a housing on which the display unit is provided.
20. It has an image sensor that receives light and a display unit that displays the image captured by the image sensor, A photoelectric converter characterized in that the light-emitting device according to any one of claims 1 to 18 is the display unit.

Description

This invention relates to an organic light-emitting device. An organic light-emitting device (hereinafter also referred to as an "organic EL device," "light-emitting device," or "organic device") is a light-emitting device comprising a pair of electrodes and an organic compound layer containing a light-emitting layer between the pair of electrodes. Organic light-emitting devices are known for their low driving voltage, diverse emission wavelengths, fast response, and the ability to be made thinner and lighter. They are used in thin displays, lighting fixtures, head-mounted displays (HMDs), and other applications. Incidentally, one known method for light-emitting devices is the use of color filters. For example, by having red, green, and blue light-emitting materials in each pixel, and forming color filters for each color on pixels that emit white light, full-color display becomes possible by spectrally separating the white light. Organic light-emitting devices using color filters do not require the formation of an organic compound layer on each individual light-emitting pixel, making it easy to achieve high resolution for the light-emitting pixels. Patent Document 1 describes a configuration in a light-emitting device that includes sub-pixels with a color filter layer and sub-pixels without a color filter layer, in order to improve the light extraction efficiency of the device. Japanese Patent Publication No. 2023-99337 (a) A cross-sectional view of the light-emitting device of this embodiment. (b) A cross-sectional view of the color filter of this embodiment.(a) A cross-sectional view of the light-emitting device of this embodiment. (b) A cross-sectional view of the color filter of this embodiment.(a) A cross-sectional view of the light-emitting device of this embodiment. (b) A cross-sectional view of the color filter of this embodiment.This is a plan view of the light-emitting device of this embodiment.This is a plan view of the light-emitting device of this embodiment.This is a plan view of the light-emitting device of this embodiment.This is a plan view of the light-emitting device of this embodiment.This is a plan view of the light-emitting device of this embodiment.This is a plan view of the light-emitting device of this embodiment.This is a plan view of the light-emitting device of this embodiment.This is a plan view of the light-emitting device of this embodiment.This is a plan view of the light-emitting device of this embodiment.This is a cross-sectional view of the light-emitting device of this embodiment.This is a schematic diagram illustrating an example of a display device according to one embodiment of the present invention.(a) A schematic diagram showing an example of an imaging device according to one embodiment of the present invention. (b) A schematic diagram showing an example of an electronic device according to one embodiment of the present invention.(a) A schematic diagram showing an example of a display device according to one embodiment of the present invention. (b) A schematic diagram showing an example of a foldable display device.(a) A schematic diagram showing an example of a lighting device according to one embodiment of the present invention. (b) A schematic diagram showing an example of an automobile having a vehicle light fixture according to one embodiment of the present invention. (c) A schematic diagram showing an example of an automobile having a display unit according to one embodiment of the present invention.(a) A schematic diagram showing an example of a wearable device according to one embodiment of the present invention. (b) A schematic diagram showing an example of a wearable device according to one embodiment of the present invention, which includes an imaging device.This figure shows an example configuration of a comparative light-emitting device. The embodiments of the present invention will be described in detail below with reference to the attached drawings. Note that the following embodiments do not limit the invention as defined in the claims. While multiple features are described in the embodiments, not all of these features are necessarily essential to the invention, and the features may be combined in any way. Furthermore, in the attached drawings, the same or similar configurations are given the same reference numerals, and redundant descriptions are omitted. Furthermore, in this specification, "top" and "bottom" of the substrate refer to the side of the substrate on which the first electrode is located, and the opposite side, respectively. Also, when it is stated that the first electrode is located on the "top" of the substrate, the substrate and the first electrode do not necessarily need to be in contact. Furthermore, in this specification, when referring to a specific light-emitting element 20 among multiple color filters, a subscript is added after the reference number, such as "light-emitting element 20 'R'". When any of the elements is acceptable,